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1
Bussell, Katrin. "PIKE fishing". Nature Reviews Molecular Cell Biology 3, n. 3 (marzo 2002): 149. http://dx.doi.org/10.1038/nrm749.
Testo completo
2
Trella, Marek, e Arkadiusz Wołos. "Size and selected characteristics of northern pike (Esox lucius L.) commercial and angling catches in Polish inland waters over the long term". Fisheries & Aquatic Life 29, n. 2 (1 giugno 2021): 108–23. http://dx.doi.org/10.2478/aopf-2021-0013.
Testo completoAbstract (sommario):
Abstract Northern pike (Esox lucius L.) is of great importance to inland commercial and recreational fisheries in Poland. Thanks to northern pike’s substantial size, strength, the possibility of using a variety of fishing methods and techniques and various baits, and many other values, lake anglers value this species above all others. Additionally, for over a decade, northern pike has been the most widely stocked species in Polish inland waters of lakes, rivers and dam reservoirs. The aim of this work was to analyze in detail the size and characteristics of northern pike commercial fisheries and angling catches in Polish inland waters over the long term. The analyses were based on a compilation of traditional scientific papers, primarily analyses of commercial catches, and a review of the results of more than 40 years of studies on the size of northern pike angling catches. The analysis of research material indicated a steady decrease in commercial catches of this species in the years State Fisheries Enterprises (SFE) were in operation followed by relative stability in catches over the past two decades. The paper describes the methods used to estimate angling catches, namely questionnaire and catch-return (the so-called register) research. An increasing disproportion between the sizes of pike catches made with angling and commercial fishing gear was documented. Despite the problems presented in the paper related to estimating total pike catches, the analysis revealed that anglers catch eightfold more northern pike than do commercial fishers.
3
Kaliniak, Agnieszka. "The effect of the fishing season on the use value and physicochemical properties of the meat of selected fish species reared in Polish aquaculture". Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego 15, n. 3 (2 ottobre 2019): 53–63. http://dx.doi.org/10.5604/01.3001.0013.5137.
Testo completoAbstract (sommario):
The objective of the research was to evaluate the impact of the fishing season on the value in use and physicochemical properties of the meat of selected fish species reared in Polish aquaculture. The study was conducted on five species: rainbow trout, common carp, grass carp, pike and tench. Fish were obtained from farms located in the Lublin Voivodeship in two seasons (spring/summer and autumn/winter). Morphometric measurements of the fish were performed, the percentage shares of body parts were assessed, and the physicochemical properties of the muscle tissue were measured: pH, electrical conductivity, water holding capacity, and CIE L*a*b* colour characteristics. The fishing season significantly affected the body weight of carp, rainbow trout and pike, the greatest body height of carp and rainbow trout, and the total length and head length of pike. Pike, grass carp and tench had significantly lower Fulton’s condition factors in the autumn/winter season than in the spring/summer season. The season significantly influenced the share of viscera in rainbow trout and grass carp, and that of fins in carp and rainbow trout. A significant impact of the season was also noted in the case of pH in rainbow trout and tench, electrical conductivity in trout, pike and tench, and the M/T ratio in grass carp and tench. Chromatic parameters differed significantly between seasons in pike (a*) and in carp and rainbow trout (b*).
4
Novitsky, R. A., O. A. Khristov e V. N. Kochet. "Іхтіопатологічні наслідки ураження прісноводних риб електрострумом". Visnyk of Dnipropetrovsk University. Biology, medicine 2, n. 1 (20 novembre 2010): 75–80. http://dx.doi.org/10.15421/021112.
Testo completoAbstract (sommario):
Data on ichthyopathological examinations of mature fish (pike, bream) from Dniprovs’ke reservoir are presented. That fish were confiscated from a person used the illegal homemade electric instrument ("electrical fishing rod"). All explored specimens of breams had keratopathy and visceral injury of different level. The most significant injuries were noted for kidney tissues. There was found the hemoperitoneum as well as nephremorrhagia and cerebral hemorrhage. In pikes it was noted the hemorrhages of hyomandibular canal. Determined ichthyopathological effects can be used for clear diagnostics of electric current lethal impact on fish.
5
Georgiev, Andrey Pavlovich, Vyacheslav Anatolievich Shirokov e Nadezhda Stepanovna Cherepanova. "FISHERY CHARACTERISTICS OF PIKE ESOX LUCIUS (L.) OF TOPO-PYAOZERO RESERVOIR (WHITE SEA CATCHMENT AREA)". Vestnik of Astrakhan State Technical University. Series: Fishing industry 2021, n. 3 (30 settembre 2021): 69–76. http://dx.doi.org/10.24143/2073-5529-2021-3-69-76.
Testo completoAbstract (sommario):
The article presents the results of the work carried out within the framework of forecast topics and economic contractual topics aimed to assess the stock and production of pike in the Topo-Pyaozero (Kumskoe) Reservoir. There have been studied its main biological and structural-population indicators. Calculations of indicators of pike’s abundance and biomass at the present stage, necessary for the rational regulation of the fishery have been carried out. It was found that the fishing possibilities of the presented pike populations correspond to the production possibilities of its sexually mature part and the value obtained as a result of the biomass increase. Pike should be taken into the commercial operation from the age of 4+ years and older. The performed calculations of the stock size based on the materials of 2009–2020 recommend the volume of the pike total allowable catch at the present stage not less than 36 tons, or 21% of the value of the commercial stock (at the maximum rate of 23.4%). From the results of observations it follows that the abundance and stocks of pike in the Topo-Pyaozero Reservoir make it possible to provide large volumes of catch at the present time, and the total catch can be increased to the calculated values the volume of the allowable catch, provided that a rational fishery is maintained in water bodies. The intensity of fishing and an increase in pike catches in the reservoir should be considered as mandatory measures in terms of biological reclamation in reservoirs
6
Grunin, Sergey I. "Dynamics of population parameters for pike Esox lucius L. (Esocidae) from the Anadyr River in the period of 1971-2010". Izvestiya TINRO 179, n. 4 (30 dicembre 2014): 45–54. http://dx.doi.org/10.26428/1606-9919-2014-179-45-54.
Testo completoAbstract (sommario):
Samples of pike were collected by Lab. of Ichthyology, IBPN FEB RAS in the middle stream of the Anadyr River at Markovo in June-September of 1971-2010 and processed by standard methods; in total 2410 specimens were analyzed. The pike population changed significantly during the period of observation: the fish in catches became smaller and younger, growth rate decreased, and absolute and relative fecundity increased, mainly under impact of fishery, including industrial one that intensified in 1970-1980s. As the result, the pike abundance decreased in 1980s, and the first-spawning females and males became to prevail in its catches. Further decreasing of the abundance was able to promote a reduction of competition in the population. The population could be restored only after considerable decrease of fishing pressure, or banning of the species fishery, that would improve the feeding conditions. Recent lowering of the fishing pressure due to low stock causes partial recovery of the population accompanied by heightening of elder fish portion. Now the fish spawned several times prevail in the catches. However, the growth rate and females fecundity still differ from the values typical for the 1970s. Partial recovery of the pike population should be accounted in estimations of its predatory on other fishes in the Anadyr River, including commercial species.
7
Wahl, David H., e Roy A. Stein. "Comparative Population Characteristics of Muskellunge (Esox masquinongy), Northern Pike (E. lucius), and Their Hybrid (E. masquinongy × E. lucius)". Canadian Journal of Fisheries and Aquatic Sciences 50, n. 9 (1 settembre 1993): 1961–68. http://dx.doi.org/10.1139/f93-218.
Testo completoAbstract (sommario):
We compared growth, survival, diet, and angler catch of muskellunge (Esox masquinongy), northern pike (E. lucius), and tiger muskellunge (E. masquinongy × E. lucius) through 5 yr after their introduction into three Ohio reservoirs. Muskellunge grew slower than northern pike and tiger muskellunge through the first year but faster than northern pike in subsequent years. Large stocked esocids (180–205 mm) survived better than small ones (145 mm). Survival patterns established through the first fall were maintained through age 5; northern pike survived best, followed by muskellunge and tiger muskellunge. Angler catch reflected differences in survival as well as catchability among taxa. Northern pike were caught at smaller sizes and younger ages than other taxa. Gizzard shad (Dorosoma cepedianum) dominated esocid diets for all taxa and age classes, followed by centrarchids and cyprinids. Prey length consumed increased linearly with esocid length; northern pike selected larger gizzard shad than either muskellunge or tiger muskellunge. These differences in population characteristics among esocids should influence mangement and stocking programs. Whereas northern pike maximize angling opportunities, muskellunge probably will provide trophy fisheries. Although tiger muskellunge can be reared inexpensively, they appear to provide little recreational fishing in return.
8
Verta, Matti. "Changes in Fish Mercury Concentrations in an Intensively Fished Lake". Canadian Journal of Fisheries and Aquatic Sciences 47, n. 10 (1 ottobre 1990): 1888–97. http://dx.doi.org/10.1139/f90-213.
Testo completoAbstract (sommario):
A small polyhumic lake inhabited by northern pike (Esox lucius), burbot (Lota lota), perch (Perca fluviatilis), roach (Rutilus rutilus), and eel (Anguilla anguilla) was fished intensively during spring 1984 and 1985 to lower the high mercury levels in the top predator, northern pike. A total catch of 29.5 kg∙ha−1 (74% roach) was removed which represented about 50% of the total fish biomass. Mercury concentrations in burbot, large pike, and small roach had decreased by 1987 and 1988, but increased in young pike and some perch. Northern pike had the clearest increase in growth rate, while that of perch and roach levelled off within 3 yr at the prefishing level. Only a small increase in growth rate of burbot occurred. The yearly accumulation of mercury in northern pike remained constant, and the decrease in [Hg] was apparently due to growth dilution. The decrease in [Hg] of burbot and roach is explained by a switch to a diet with lower [Hg] or a decrease in water methylmercury concentrations. The amount of methylmercury removed from the lake by fishing was equivalent to several years of calculated mercury methylation and accumulation in the fish. Overfishing may be a feasible means of lowering methylmercury levels in this type of oligotrophic lake.
9
Shutkarayev, A. V., G. K. Barinova e A. S. Assylbekova. "ASSESSMENT OF THE STATE OF FISH RESOURCES OF LAKE BOROVOE". Chronos 6, n. 8(58) (13 agosto 2021): 8–14. http://dx.doi.org/10.52013/2658-7556-58-8-2.
Testo completoAbstract (sommario):
This article provides an assessment of the state of fish resources of Lake Borovoe. 5 stations were surveyed to study the ichthyofauna. Currently, the lake is home to 12 species of fish from 5 families. The most widely represented family of carp is represented in Lake Borovoe, 5 species are noted, 3 species are found from the whitefish family, 2 species from perch, the pike and balitor families are represented by 1 species. In general, the state of fish resources in Lake Borovoye is assessed as satisfactory. According to the results of research fishing, it was established that the organization of amateur (sports) fishing, fishing for reproductive purposes, and research fishing is possible in Lake Borovoye.
10
Badryzlova, Nina Sergeevna. "Comparative characteristics of the conditions for harvesting, transportation and spawning of pike perch in fish farms in Kazakhstan". Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries), n. 8 (27 luglio 2021): 43–55. http://dx.doi.org/10.33920/sel-09-2108-04.
Testo completoAbstract (sommario):
A description of biotechnical methods of harvesting pike perch in natural reservoirs, methods of catching pike perch spawners, keeping in adaptation cages and transporting pike perch from fishing sites to the farm is given. Pike perch breeders were caught from the reservoirs with fixed and floating nets during the period: in the Kapshagai reservoir from 10 to 20 April; in the Syrdarya river — from April 20 to May 5. The adaptation was carried out in cages located in the coastal zone. Transportation to the fish farm was carried out in live fish tanks with a volume of 1 and 3 m³ with water aeration. The reproduction of pike perch was carried out in two fish farms of the Republic of Kazakhstan. The data on spawning of pike perch in two ways are given: in cages on nests; as well as the receipt of reproduction products by the factory method from “flowing” producers. In the first case, females and males were placed in cages in a ratio of 1:1 and 1:2; a spawning nest was installed in each cage and spawning was monitored. In the second case, from the “flowing” pike perch breeders ready for spawning, reproductive products (eggs and sperm) were obtained, fertilization and degluing were carried out with a suspension of white clay. The monitoring of hydrochemical indicators was constantly carried out, the dates of the beginning and end of spawning of pike perch were determined. The article presents the fish-breeding and biological characteristics of pike perch producers participating in spawning. The mass of spawned pike perch females in LLP “Halyk Balyk” ranged from 2 kg to 2.5 kg, males — 1.5–2.5 kg; females weighing 2.1–2.6 kg were used in the Republican State Enterprise “Kamyshly-Bashsky Fish Hatchery”; males — from 1.2 kg to 2.4 kg. Based on the results of the research, biotechnical standards were developed for the preparation of pike perch producers in water bodies, for transportation to fish farms, standards for spawning of pike perch in various ways.
11
Sharakhmetov, S. Е., T. R. Barakbayev e T. O. Adayev. "Efficiency of Sonar Fish Protection Device at the Kokaral Dam of the Small Aral Sea". Central Asian Journal of Water Research 7, n. 1 (30 giugno 2021): 158–76. http://dx.doi.org/10.29258/cajwr/2021-r1.v7-1/158-176.eng.
Testo completoAbstract (sommario):
The study aimed to assess the efficiency of the pilot hydro-acoustic (sonar) fish protection device (SFPD) installed at the Kokaral Dam of the Small Aral Sea. For this purpose, between August 27 and September 5, 2020 experimental and control fish catching was carried out using fixed fishing nets (30×60 mm mesh). The SFPD’s effectiveness was assessed based on the amount and species diversity of the caught fish with and without the SFPD operating. Fish behavior and distribution were monitored using an echo sounder. In terms of quantity, 173 fish were caught with the SFPD off, and 94 with the SFPD on. In terms of biomass, the values were 37.5 kg and 27.6 kg, respectively. With the SFPD off, the ichthyofauna composition was represented by 12 fish species: carp, crucian carp, roach, ide, bream, common rudd, saber carp, snakehead, pike perch, perch, pike, and asp. With the SFPD on, roach and ide were absent in the catch, and the quantity of common rudd significantly decreased. In both catches, the quantity of carp and crucian carp was similar; bream and saber carp specimen were sporadic. The number of predatory fish (pike, perch, snakeheads, and pike perch) in the catches increased. Asp was absent in the net catches also; however, this fish species represents the main object of amateur hook and line fishing. Based on the catch-per-effort unit, it can be concluded that whereas the SFPD observed efficiency for small non-predatory fish like ide, roach, and common rudd was 95%, it was 0% for large non-predatory fish (carp and crucian carp); and negative for predatory fish.
12
Asylbekova, Saule Zhangirovna, Nina Sergeevna Badryzlova, Saya Kashkinbayevna Koyshibaeva e Kuanysh Baibulatovich Isbekov. "Economic efficiency of forming pike perch broodstocks in fish farms of Kazakhstan". Vestnik of Astrakhan State Technical University. Series: Fishing industry 2020, n. 2 (30 giugno 2020): 106–15. http://dx.doi.org/10.24143/2072-9502-2020-2-106-115.
Testo completoAbstract (sommario):
The article highlights the problem of the industrial press on the pike perch population in all reservoirs of Kazakhstan and the sharp decline in its population due to increased exports of pike perch to Europe, which led to the need to fill the shortage of fish stock by forming pike perch broodstocks in the fish farms and increasing the importance of aquaculture. There are presented the results of introducing the technology of pike perch broodstocks formation in conditions of the fish farm HalykBalyk, LLP, which is carried out in two ways: by a method of domestication that provides catching pike perches from the natural reservoirs and adopting the spawners to the con-ditions of the fish farm: by obtaining offspring from the wild pike perch producers and growing the seeding material in ponds with subsequent selection for the broodstock. There have been given the calculations and analysis of the economic efficiency of biotechnological techniques for the phased formation of the breeding stock of pikeperch in a fish farm. There are presented the data on the cost of domestication of pike perch producers harvested in the natural pond and transported from the fishing sites to the hatcheries, as well as fish products: fertilized eggs, larvae that switched to mixed feeding, raised juveniles, fingerlings and two-year-olds raised in polyculture with traditional fish species in ponds in order to form a breeding stock of pike perch by the ‘ab ovo’ method. A diagram of the production processes of forming pike perch broodstock is presented. To determine the economic efficiency of growing pike perch yearlings and two-year-olds in the ponds in polyculture with carp and grass carp, the general costing of ponds, specific production costs and data on fish catch in monetary terms are presented. A comparative analysis of the results has been held; the ways to reduce the cost of pike perch production at each stage have been indicated.
13
Gorokhov, Maxim, Veronica Nikolaevna Tkach e Vitali Victorovich Barabanov. "Mechanism of assessment of anthropogenic impact on the reserves of aquatic biological resources in the Astrakhan region". Fisheries 2022, n. 6 (6 dicembre 2022): 16–20. http://dx.doi.org/10.37663/0131-6184-2022-6-16-20.
Testo completoAbstract (sommario):
The nature and methods of fishing become extremely important in inland waters with a limited raw material base and sharply changing reproductive capacity of fish herds under the influence of habitat. Currently, 19 species of semi-passable and river fish are used in the Astrakhan region. All these species live in a single water area and practically do not create local single-species clusters. The modern resource base of semi-navigable and river fish, on which industrial fishing in the Astrakhan region is based, is limited. Stocks of a number of fish species are declining – roach, tench, pike. Stocks of others are stagnating at a low level – bream, catfish. At the same time, the annual increase in fishing intensity due to the commissioning of new fishing sites does not compensate for the decrease in commercial catches, which indicates the tense state of the fishing resource base in the Astrakhan region.
14
Mickiewicz, Maciej, e Marek Trella. "Economic effectiveness of pike (Esox lucius L.) stocking based on the example of selected lakes in East European Plain with consideration of their natural conditons". Fisheries & Aquatic Life 27, n. 3 (1 settembre 2019): 136–48. http://dx.doi.org/10.2478/aopf-2019-0016.
Testo completoAbstract (sommario):
Abstract The aim of the study was to assess the economic effectiveness of pike (Esox lucius L.) stocking based on the value of fish caught with commercial fishing gears and the value of stocking material introduced into 44 lakes in the Ełk Lake District in northeastern Poland. The effectiveness of stocking is presented against the background of lake environmental conditions in the context of their natural potential for pike populations to inhabit and develop in them. The data analyzed regarded the size and value of catches and stocking from 1996-2017 that was obtained from an entity authorized to exploit fisheries. Information on selected lake morphometric, morphological, and environmental parameters was also obtained from this source. The value of pike catches in the analyzed period was characterized by a high, stabile level, and the stocking level increased. The indicator of the stocking economic effectiveness was at a high average annual level in excess of 3.9 PLN of catches per 1.0 PLN for stocking, but it decreased during the period analyzed. The high stocking effectiveness in the studied lakes was determined by, inter alia, natural conditions, stocking material quality, properly performed stocking, and efficient exploitation. However, it can be concluded that it is mainly stocking that maintains pike catches at a high, relatively stable level in the lakes analyzed. Additionally, new methods of pike population management are discussed, e.g., catch and release.
15
Krainyuk, V. N., A. V. Shutkarayev, G. K. Barinova e A. S. Assylbekova. "THE STATE OF THE ICHTHYOFAUNA AND FACTORS AFFECTING FISH POPULATIONS OF THE LAKES OF THE KORGALZHYN STATE NATURE RESERVE". Chronos: natural and technical sciences 6, n. 4(37) (3 novembre 2021): 10–15. http://dx.doi.org/10.52013/2712-9691-37-4-2.
Testo completoAbstract (sommario):
The results of the cadastral survey of 4 reservoirs located on the territory of the Korgalzhyn State Nature Reserve are presented. The assessment of the main biological characteristics of living fish is given: size, weight composition, linear and weight growth rate. In total, 15 species of fish from 5 families were found in the surveyed reservoirs in 2016-2020. The carp family is most widely represented in the reservoirs of the national park, 9 species are noted, the loach, pike and stickleback families are represented by 1 species, perch — 3 species. According to the results of research fishing, it was found that in the lakes of the Korgalzhynsky SNR, the organization of reclamation fishing in the form of total trapping and research fishing is necessary in 2021.
16
Barabanov, Vitali Victorovich, e Valentina Anatolievna Izherskaya. "Evaluation of freshwater ichthyofauna of the Volga-Akhtuba floodplain at current stage (2018-2019)". Vestnik of Astrakhan State Technical University. Series: Fishing industry 2020, n. 2 (30 giugno 2020): 52–58. http://dx.doi.org/10.24143/2072-9502-2020-2-52-58.
Testo completoAbstract (sommario):
The article assesses the state of freshwater ichthyofauna of the Volga-Akhtuba floodplain (VAP) in the modern period. A retrospective analysis of the dynamics of the composition of the ichthyofauna of the floodplain under the influence of different fishing regimes was carried out. The increasing role of amateur fishing in this process has been defined. There has been defined the orientation of changes including increasing pressure on the most valuable fish species (perch, brim, pike perch, sazan and perch), unstable hydrological regime of the Lower Volga during the repro-duction period, growth of illegal, unreported and unregulated fishing, etc. The values of the qualitative and quantitative composition of net catches of fish are given. The extrapolation method assuming
a uniform distribution of the ichthyofauna calculated the commercial stock of freshwater ichthyofauna of the floodplain. It has been noted that in the stock structure of the Volga-Akhtuba floodplain there dominate the typical river species, more than 50% of which are presented by bream, crucian carp, sabrefish and blue bream. In the context of the limited extraction (catch) of aquatic biological resources by industrial fisheries, the commercial stock of semi-migratory and river fish in the Volga-Caspian and North Caspian fishery subareas due to the unaccounted stocks of the Volga-Akhtuba floodplain can be increased by 10%, and for such fish as pike perch – by 13%, crucian carp – by 15%, silver breeds, bersh, silver carp and grass carp – by 50%, zope and sabrefish – by 100%, roach – by 200%. The commercial stock is currently being developed by amateur fishing, the volumes of which do not undermine the reproductive potential of the freshwater ichthyofauna of the Volga-Akhtuba floodplain.
17
Zakęś, Zdzisław, Renata Pietrzak-Fiećko, Mirosław Szczepkowski, Monika Modzelewska-Kapituła e Barbara Jankowska. "Slaughter yield and fatty acid profiles of fillets of pike (Esox lucius L.) caught before and after spawning". Archives of Polish Fisheries 23, n. 4 (1 dicembre 2015): 231–35. http://dx.doi.org/10.1515/aopf-2015-0027.
Testo completoAbstract (sommario):
Abstract The aim of the study was to determine the impact pike fishing season (before spawning in fall (group A) and after spawning in spring (group B)) had on the slaughter yield and fillet fatty acid profile. The slaughter yield of fillets with skin and skinned fillets from the group B fish was significantly lower (by approximately 7.5% of body weight). The fatty acid profile of the fish meat from the groups examined differed significantly. The fillets of pike caught before spawning were dominated by unsaturated fatty acids (UFA), while those from fish caught after spawning had mainly saturated fatty acids (SFA). The share of polyunsaturated fatty acids (PUFA) in the fillets of fish that had spawned was sixfold lower, and the n-3 PUFA differences were nearly ninefold. The content of eicosapentaenoic (EPA) and docosahexaenoic (DHA) fatty acids in fillets of fish that had spawned was ninefold lower than in those that had not yet done so. Consequently, the ratio of n-3 PUFA/n-6 PUFA in pike from group A was over three times higher than that in the fish that had spawned (2.61 vs 0.82). Fillets from pike that have spawned are a significantly poorer source of valuable fatty acids for consumers.
18
Nur Hidayah, Lisa, Iin Solihin, Eko Sri Wiyono e Mochammad Riyanto. "Estimasi Ketersediaan Ikan dan Kebutuhan Bahan Baku Industri Pengolahan Ikan Di PPN Brondong Lamongan". Marine Fisheries : Journal of Marine Fisheries Technology and Management 13, n. 1 (26 luglio 2022): 91–99. http://dx.doi.org/10.29244/jmf.v13i1.40569.
Testo completoAbstract (sommario):
The Brondong Fishing Port is the largest in East Java. The catches landed in the Brondong fishing port increase, but they are insufficient to meet the raw material necessity of the existing processing industry. The study aims at estimating fish availability and the necessity of raw materials for the fish processing industry in the Brondong fishing port. This research was conducted from January to March 2022 by using a descriptive method. Data were collected through interviews and a literature study. The results revealed that the installed capacity for eight fish processing industries in the Brondong fishing port counted as 123,300 tons/year. Starry triggerfish, Lizard fishes, Streaked spine foot, freckled goatfish, squid, croaker, red snapper, spotted sil, grouper, threadfin breams, hardtail, big eyes, and yellow pike conger were all necessary for the processing industry. In contrast, the estimation of fish availability for the fish processing industry at Brondong fishing port counted as 45,086 tons/year. It indicated a gap between fish availability and the demand from the fish processing industry in the Brondong fishing port. This may impact the fish processing industry's development in the Brondong fishing port. Keywords: Raw material necessity, fish availability, fish processing industry
19
Bursell, Jens Jakob, e Robert Arlinghaus. "Citizen science data suggest that a novel rig improves landing rate and reduces injury and handling time in recreational angling with artificial lures in Baltic pike (Esox lucius)". PeerJ 6 (17 maggio 2018): e4744. http://dx.doi.org/10.7717/peerj.4744.
Testo completoAbstract (sommario):
The optimal terminal gear in hook-and-line recreational fishing maximizes landing rates and minimizes injury to the fish because some fish will be released after capture. We designed a novel rig configuration in artificial lure fishing for top predators and examined its effectiveness in angling for Baltic northern pike (Esox lucius) using a citizen science approach based on observational data collected from volunteer anglers in the field. The novel rig included two changes to traditional rig designs common to artificial lure angling. First, hooks were mounted in a way giving better hook exposure and eliminating lever-arm effects from the lure to the hooks once a fish is hooked. This construction allowed the second change, being a shift to hooks 4–5 sizes smaller than those used on traditional hook mounts. We analysed observational data collected by volunteer anglers using either the novel rig or a standard rig mount in two types of artificial lures (softbait and hardbait) of the same size (about 17 cm). UsingN = 768 pike contacts as input data, we showed the landing rates of pike targeted with artificial lures significantly and substantially increased from 45% with normal-rigs to 85% when the same lure types were fished with the novel rig configuration. Lure type and water temperature had no effects on landing rates. Moreover, hardbaits on normal-rigs produced significantly more injury, bleeding and elevated unhooking time compared to fish captured on hardbaits with release-rigs. We conclude that simple changes to traditional hook sizes and mounts in lure fishing may benefit both anglers and the fishes that are to be released and that citizen science projects with volunteer anglers are able to provide good data in proof-of-concept studies. Further experimental studies are needed to differentiate hook size from hook mount effects because both variables were confounded in the results of the observational data presented here.
20
Kurzhikaev, Zh, A. S. Assylbekova e G. K. Barinova. "ICHTHYOFAUNA OF THE LAKE ZERENDINSKOE SNNP «KOKSHETAU»". Chronos 6, n. 8(58) (13 agosto 2021): 3–8. http://dx.doi.org/10.52013/2658-7556-58-8-1.
Testo completoAbstract (sommario):
This article presents the results of studies of the ichthyofauna of Lake Zerendinskoe in 2020. The ichthyofauna of Lake Zerendinskoe is represented by 7 commercial fish species. The age range of the studied species varied from 2+ to 9+. The biological parameters of bream, carp, common pike, whitefish and common perch varied within the average limits. According to the biological indicators of roach, there is a slightly slowed growth. When studying the sex ratio, there is a predominance of females. The state of the ichthyofauna is considered stable and it is recommended to conduct both sports and amateur, and reclamation fishing, and fishing for reproductive purposes.
21
Amundsen, Per-Arne, e Roar Kristoffersen. "Infection of whitefish (Coregonus lavaretus L. s.l.) by Triaenophorus crassus Forel (Cestoda: Pseudophyllidea): a case study in parasite control". Canadian Journal of Zoology 68, n. 6 (1 giugno 1990): 1187–92. http://dx.doi.org/10.1139/z90-176.
Testo completoAbstract (sommario):
A case study of Triaenophorus crassus control in two sympatric whitefish populations was carried out in Stuorajavri, northern Norway. The densities of whitefish and pike were markedly reduced by an intensive fishing programme and during the 6 years of investigation, a dramatic decline in T. crassus infection of whitefish was observed. The mechanisms involved in parasite control were elucidated by studying the differences in infestation over time between T. crassus and a related cestode, Diphyllobothrium ditremum, in the two whitefish populations. Reduction in population density of the final host, pike, is suggested as being the key factor in control of T. crassus. Exploitation and reduction of whitefish population density contributed to decreased infection in one of the whitefish populations by influencing its acquisition of parasites via a change in its food selection.
22
Pshenichniy, Ju L. "SOURCES FOR INVESTIGATION FISHERY IN DUBNO IN XVI—XVIII cc." Archaeology and Early History of Ukraine 30, n. 1 (25 marzo 2019): 280–85. http://dx.doi.org/10.37445/adiu.2019.01.22.
Testo completoAbstract (sommario):
Fishery took important place in economic and social development of Dubno in XVI—XVIII cc. There were two large ponds around Dubno in that period. Also they are well-known from historical sources as Surmycky pond and Ivansky pond. Fishery tools, which were found during archeological investigations in Dubno testify about methods of fishing, which were used by the population of the town. They are led and clay sinkers for the nets, iron fishing spears and spud, copper tackle. The fish remains from Dubno castle and Spaso-Preobrazhensky monastery belonging to eight fish species (pike, roach, indeterminate carp fish, sturgeon, common rudd, common bream, european catfish, european perch). These two prosperous centers had obviously the largest sizes of cached fishes.
23
Kamelov, Askarbay Kadralievich. "State of populations and fishing of semi-anadromous fish in the North-Eastern Caspian sea". Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries), n. 4 (3 aprile 2021): 22 (87)—30 (94). http://dx.doi.org/10.33920/sel-09-2104-02.
Testo completoAbstract (sommario):
Semi-anadromous fish (roach, bream, pike-perch, asp) are the main objects of fishing in the coastal zone of the North-Eastern part of the Caspian Sea. The state of the populations of these fish changes significantly under the influence of natural and, especially, anthropogenic factors, which have increased in recent years. The aim of this work was to study the current state of populations of semi-anadromous fish in the NorthEastern Caspian Sea. Based on the materials of three years of research (2016, 2018, 2020), with the involvement of literary sources, long-term changes in the size-weight and, age indicators, nutritional status of fish and the sex ratio in populations are considered. It has been established that the state of the semi-anadromous fish populations in the North-Eastern Caspian remains tense at the present time. All populations are characterized by general negative patterns of state change. There are tendencies of decrease in size, weight and age indicators, the number of populations and fish catches are decreasing. These changes were least of all manifested in bream (whose state is relatively stable) and were most pronounced in pike perch. The depressive state of the populations is explained by a decrease in the scale of natural reproduction in recent years, due to a decrease in the water content of the Ural River and the number of spawners allowed to spawn on the river. Marine fisheries in the North-Eastern Caspian are concentrated in shallow waters, which increases the fishing load on semi-anadromous fish and prevents their passage to spawning. It is necessary to reduce the pressure of fishing by reducing the number of nets used in the shallow water area of the North-Eastern Caspian and strict observance of the rule of the forbidden pre-estuary space of the river Ural. English version of the article on pp. 87-94 is available at URL: https://panor.ru/articles/state-of-populations-and-fishing-of-semi-anadromous-fish-in-the-north-eastern-caspian-sea/64076.html
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Piličiauskas, Gytis, Giedrė Vaikutienė, Dalia Kisielienė, Aldona Damušytė, Giedrė Piličiauskienė, Kęstutis Peseckas e Lukas Gaižauskas. "A CLOSER LOOK AT ŠVENTOJI 2/4 – A STRATIFIED STONE AGE FISHING SITE IN COASTAL LITHUANIA, 3200–2600 CAL BC". Lietuvos archeologija Lietuvos archeologija, T. 45 (22 novembre 2019): 105–43. http://dx.doi.org/10.33918/25386514-045003.
Testo completoAbstract (sommario):
Šventoji 2/4, which is situated on the Lithuanian coast, is among the most important East Baltic Stone Age sites due to the extraordinary preservation of archaeological finds in waterlogged gyttja and due to extensive excavations ongoing since 1967. This paper presents the results of excavations in 2014 and subsequent laboratory analyses. This new research has allowed for the revision of the site’s chronology and function as well as provided valuable environmental data. In 3200–2700 cal BC the site was used as a fishing station constructed in the deepest part of the shallow lagoonal lake. Remains of various fishing gear and other human waste left during fishing expeditions accumulated there. Enormous amounts of cranial fish bones left during the initial processing of the catch that was carried out directly at the fishery indicate that cyprinids, pike, and zander were mostly caught at the site. The site most likely continued to be used in similar way during the beginning of the Neolithic, although Globular Amphora culture fishermen did not process fish on the site and transported the entire catch to dwelling sites instead. Keywords: Subneolithic, Neolithic, coastal Lithuania, fishing, environment.
25
Edeline, Eric, Arnaud Le Rouzic, Ian J. Winfield, Janice M. Fletcher, J. Ben James, Nils Chr Stenseth e L. Asbjørn Vøllestad. "Harvest-induced disruptive selection increases variance in fitness-related traits". Proceedings of the Royal Society B: Biological Sciences 276, n. 1676 (9 settembre 2009): 4163–71. http://dx.doi.org/10.1098/rspb.2009.1106.
Testo completoAbstract (sommario):
The form of Darwinian selection has important ecological and management implications. Negative effects of harvesting are often ascribed to size truncation (i.e. strictly directional selection against large individuals) and resultant decrease in trait variability, which depresses capacity to buffer environmental change, hinders evolutionary rebound and ultimately impairs population recovery. However, the exact form of harvest-induced selection is generally unknown and the effects of harvest on trait variability remain unexplored. Here we use unique data from the Windermere (UK) long-term ecological experiment to show in a top predator (pike, Esox lucius ) that the fishery does not induce size truncation but disruptive (diversifying) selection, and does not decrease but rather increases variability in pike somatic growth rate and size at age. This result is supported by complementary modelling approaches removing the effects of catch selectivity, selection prior to the catch and environmental variation. Therefore, fishing most likely increased genetic variability for somatic growth in pike and presumably favoured an observed rapid evolutionary rebound after fishery relaxation. Inference about the mechanisms through which harvesting negatively affects population numbers and recovery should systematically be based on a measure of the exact form of selection. From a management perspective, disruptive harvesting necessitates combining a preservation of large individuals with moderate exploitation rates, and thus provides a comprehensive tool for sustainable exploitation of natural resources.
26
Schroeder, Susan A., e David C. Fulton. "Fishing for Northern Pike in Minnesota: Comparing Anglers and Dark House Spearers". North American Journal of Fisheries Management 34, n. 3 (4 maggio 2014): 678–91. http://dx.doi.org/10.1080/02755947.2014.910573.
Testo completo
27
Buzevich, O., V. Gurbik, S. Koba e N. Tushnytska. "Current state of secondary commercial species populations in the Kremenchutskе reservoir". Ribogospodarsʹka nauka Ukraïni., n. 4(54) (28 dicembre 2020): 47–58. http://dx.doi.org/10.15407/fsu2020.04.047.
Testo completoAbstract (sommario):
Goal. To determine and analyze the structural and quantitative parameters of secondary commercial species of the Kremenchug reservoir. Methodology. The data of commercial catches of the Kremenchug reservoir for 2009–2019 were used as primary materials. The methods generally accepted for ichthyological studies were used for the sampling and further analysis Findings. Commercial catches of native fish species belonging to the category of "secondary large species" (catfish, pike, asp, chub) in the Kremenchug reservoir in recent years show a tendency for an increase: in 2010-2014 their landing was at 78 tons, in 2015 - 104 tons, in 2016 - 107 tons, in 2017 - 134.9 tons. This increase was mainly (by 65%) ensured catfish, to a lesser extent (by 30%) by pike. In 2018, there was a significant decrease in landings in this category to 116.1 tons, in 2019 - again an increase to 140.7 tons. A similar trend was observed for the category of secondary small-sized species (perch, knife, rudd, tench): in 2010-2014 the catch did not exceed 66 tons, in 2015 - 104 tons, in 2016 - 107 tons, in 2017 - 97 tons. In recent years, the maximum catches of commercial native fish species belonging to this category were observed, e.g., 179.6 tons in 2018, 175.3 tons in 2019. Due to a low abundance of these species, both commercial and survey catches have a certain instability, while there is a lack of clear trends in the dynamics of structural and functional parameters of catches. The main factor that limits the statistics of this category is the organization of fishing and accounting of landed fish. Originality. For the first time, data on commercial catches of native fish species belonging to the category of "secondary large species" and "secondary small species" in the Kremenchug reservoir in recent years have been obtained and analyzed. Practical significance. The obtained results will be used for preparation of the fishing regime in the Kremenchug reservoir. Improving the level of organization of fishing and accounting of landed fish. Keywords: reservoir, secondary large species, secondary small species, commercial catch.
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Vybornov, Aleksandr Alekseevich, Filat Faritovich Gilyazov, Natalia Sergeevna Doga, Aleksandr Ivanovich Yudin e Evheniia Yurievna Yanish. "New data about the Orlovskaya culture household in the steppe Volga region". Samara Journal of Science 10, n. 2 (1 giugno 2021): 136–40. http://dx.doi.org/10.17816/snv2021102201.
Testo completoAbstract (sommario):
Researchers suggest a hypothesis that one of the indicators of the Neolithic is settlements based on stable fishing using boats and nets. The northern part of the Lower Volga region is a steppe zone. The peculiarities of natural and climatic conditions (arid climate, a small number of rivers) predetermined a low population density in comparison with other regions. The location of long-term camps is traced on different rivers on particular distance from each other. This provided normal conditions for life of the Orlovskaya culture representatives. The culture stratification in loam leaded to good preservation of faunal remains. The big archeozoological material was accumulated for reconstruction of these societies household. Hunting was carried out mainly on large ungulates. In addition, waterfowl accounted for a significant proportion. A domestic dog provided assistance in hunting. Finds of bone harpoons and hooks, accumulations of scales and bones of pike and perch are speaking about individual fishing. Stone sinkers, axes and adzes, vertebrae may suggest fishing with a net from a boat or a raft. The absence of sturgeon remains give a thought that the Bolshoi Uzen River didnt flow into the Caspian Sea in the Late Stone Age.
29
Mickiewicz, Maciej, Arkadiusz Wołos e Marek Trella. "Characteristics of illegal inland fishing according to the opinions of Polish fisheries guards". Fisheries & Aquatic Life 28, n. 2 (1 giugno 2020): 125–32. http://dx.doi.org/10.2478/aopf-2020-0015.
Testo completoAbstract (sommario):
AbstractPoaching is still a great problem in Poland. Officers of the fisheries guard from three regions in northeast Poland rich in natural inland waters were surveyed. The most frequent type of poaching encountered by the officers was that practised by recreational fishers using rods (ranking of 4.4 points on a scale of 0–5) followed by poaching stemming from poverty or unemployment (3.4 points), and poaching by professional fishermen was ranked the lowest (1.5 points). Organized poaching was identified as the most dangerous for ichthyofauna (42% of responses), followed by poaching by recreational fishers (28%) and poaching stemming from poverty or unemployment (23%). According to the officers surveyed, the species that were targeted by poachers most frequently were the predators: pike, Esox lucius (98% of responses), European eel, Anguilla anguilla, pikeperch, Sander lucioperca and perch, Perca fluviatilis.
30
Korolev, Arcady Ivanovich, Anton Alexandrovich Shalapinin e Eugeniya Yurievna Yanish. "Fishery in the eneolithic forest-steppe of the Volga Region (on excavation materials of Lebyazhinka VI settlement in 2013-2014 years)". Samara Journal of Science 5, n. 4 (15 dicembre 2016): 85–91. http://dx.doi.org/10.17816/snv20164203.
Testo completoAbstract (sommario):
The following paper contains information about fishers weapons and fish bones founded in Lebyazhinka VI eneolitic settlement in the forrest-steppe region of the Volga river. We analyse materials of the second half of the IV millennium BC. The filling of pits represents dwellings with the inner edge, stone and bone tools, animal bones of turtles, birds and fish. The importance of this studiing is in the possibility of a complex view. The purpose of this article is to analyze the fish catching, hunting and fish bones. Hunting tools are represented by bone harpoons with one, two or many teeth, arranged on one side. There are two types of fishbone hooks: whole and composite. We determined the typological features of catching tools, and moreover we determined quantitative, species, age and size characteristics of fish. The main fishes were pike and catfish, then luce, pike, perch, roach, sturgeon, sterlet. The fish sizes are medium and large, the age is about 8-10 years. We have an opinion of the way of fishing including hooks, harpoons, nets and stakes. The research will be completed with new materials.
31
Ilmast, N. V., O. P. Sterligova, Ya A. Kuchko, A. N. Sharov, E. S. Savosin e D. S. Savosin. "MASLOZERO LAKE ECOSYSTEM AND THE RESULTS OF THE RELEASE OF THE SMELT OSMERUS EPERLANUS INTO THE LAKE". Russian Journal of Biological Invasions 14, n. 2 (11 giugno 2021): 40–51. http://dx.doi.org/10.35885/1996-1499-2021-14-2-40-51.
Testo completoAbstract (sommario):
The results of the study of the Maslozero Lake ecosystem (the White Sea basin) are reported. The lake is small, deep and poorly lotic. Its hydrochemical and hydrobiological indices were studied. The quantitative and structural indices of the state of the lake’s zooplankton and macrozoobenthos are presented for the first time. The lake is an oligo-mesotrophic water body type, as indicated by the nutrient content scale. The lake is inhabited by 14 fish species of 11 families. The perch Perca fluviatilis , the whitefish Coregonus lavaretus, the pike Esox lucius, the roach Rutilus rutilus and the introduced smelt Osmerus eperlanus are most abundant. The introduction of the smelt into Maslozero Lake is appraised. The smelt in the lake has naturalized, is successfully reproducing and has become abundant. Its growth rate is identical to that of the smelt from its parental water body - Ladoga Lake. The food ration of predatory fish (pike, burbot, perch and char) is dominated by smelt as the most abundant and accessible food item available all year round. The lake is used by the local population for economic purposes, recreation, amateur fishing and fish culture.
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Shakirova, Firdauz Mubarakovna, Yuri Aleksandrovich Severov, Olga Konstantinovna Anokhina, Mikhail Aleksandrovich Gorshkov, Guzel Damirovna Valieva, Anton Valentinovich Granin e Rimma Akhtyamova. "ANALYZING STOCK STATUS OF MAIN COMMERCIAL FISH IN KUIBYSHEV RESERVOIR IN 2000–2018 AND EFFECTIVENESS IN FISHING". Vestnik of Astrakhan State Technical University. Series: Fishing industry 2021, n. 1 (17 marzo 2021): 38–50. http://dx.doi.org/10.24143/2073-5529-2021-1-38-50.
Testo completoAbstract (sommario):
The article presents a review of the main commercial fish stocks of the Kuibyshev Reservoir based on the long-term research data (2000–2019). The Kuibyshev Reservoir is the leading fishery reservoir in the Republic of Tatarstan, Mari El, Chuvashia, Ulyanovsk and Samara Re-gions. There have been given the data of regular observing species, sex, size-weight and age composition of fish, their reproduction efficiency, distribution, abundance and reproduction of aquatic biological resources, their habitat, as well as control over their fishing and conservation. The analysis of the influence of environmental factors (level and temperature regimes) and fishing on the fish stocks formation is presented. Based on the presented materials, there have been shown the data about the stocks of the main commercial fish species of the Kuibyshev Reservoir (bream, zander, pike, carp, catfish, sterlet) and of the small-sized ordinary fish stocks, the optimal development of which will bring the catches up to 10 thousand tons and more. It has been inferred that for rational fishing in the reservoir, it is necessary to develop a strategy for the integrated effective development of biological resources of the reservoir on an ecosystem basis for better use of the bioproduction capabilities of its biological resources.
33
Kotakorpi, M., J. Tiainen, M. Olin, H. Lehtonen, K. Nyberg, J. Ruuhijärvi e A. Kuparinen. "Intensive fishing can mediate stronger size-dependent maternal effect in pike (Esox lucius)". Hydrobiologia 718, n. 1 (26 giugno 2013): 109–18. http://dx.doi.org/10.1007/s10750-013-1607-5.
Testo completo
34
Kuparinen, Anna, Thomas Klefoth e Robert Arlinghaus. "Abiotic and fishing-related correlates of angling catch rates in pike (Esox lucius)". Fisheries Research 105, n. 2 (luglio 2010): 111–17. http://dx.doi.org/10.1016/j.fishres.2010.03.011.
Testo completo
35
Badryzlova, N. "Experience of reproduction of a ship in artificial conditions fishing facilities of the Kyzylordin Region of Kazakhstan". Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries), n. 6 (1 giugno 2020): 56–64. http://dx.doi.org/10.33920/sel-09-2006-07.
Testo completoAbstract (sommario):
The article presents data on the capture of pikeperch producers from natural reservoirs, the placement of males and females in pairs for spawning in cages on nests; spawning and sexually obtained products by the factory method, incubation of pike perch eggs in the grass carp incubation apparatus, and hatching of larvae. As a result of the studies, the dates of the beginning and end of spawning, the duration of incubation of eggs and hatching of pikeperch larvae were determined. The conclusion is the optimal dates for the spawning campaign of zander; optimal sizes of manufacturers. The principal opportunity of the artificial is reproduction of zander in the conditions of fish farming in the south of Kazakhstan.
36
Severov, Yuri Aleksandrovich, Yuriy Victorovitch Gerasimov, Michail Ivanovich Bazarov e Tamara Alekseevna Telezhnikova. "The structure of pelagic fish communities of the Kuibyshev reservoir, based on the materials of accounting surveys in 2016-2019". Fisheries 2022, n. 6 (6 dicembre 2022): 46–52. http://dx.doi.org/10.37663/0131-6184-2022-6-46-52.
Testo completoAbstract (sommario):
The regulation of the flow of the Volga River by the Zhigulevskaya HPS has changed the living conditions for many fish species. At the same time, the pelagial was a completely new type of biotope for the fish population. The fish population of the Kuibyshev reservoir, newly formed in the pelagial, began to have certain features inherent in this biotope. Currently, according to the results of four years of research, 18 species of fish have been noted here, belonging to 5 families, the basis of which are five species - kilka, sabrefish, bleak, pike perch and bream. It was revealed that the Volga part of the reservoir is more productive than the Kama part, and pelagic fish communities have a certain vertical distribution and migration through the water column, mainly occupying the biomass accumulation zone. The absence of a fishing fleet and the trend in the development of fishing on the reservoir casts doubt on the further rational use of aquatic biological resources in this ecological zone of the Kuibyshev reservoir.
37
Burhaz, M. I., T. I. Matvienko, K. I. Bezik e A. I. Lichna. "Evaluation of the state of industrial water bioresources in fish areas of Ukraine". Ukrainian Journal of Veterinary and Agricultural Sciences 4, n. 3 (31 dicembre 2021): 68–75. http://dx.doi.org/10.32718/ujvas4-3.12.
Testo completoAbstract (sommario):
Agriculture, fisheries, and the food industry play a key role in ensuring the country's food security. The modern fishing industry in Ukraine is a highly industrial, capital-intensive, integrated production with high production costs, which is designed to ensure the socio-economic development of many coastal regions and provide the population with valuable protein products necessary for healthy eating. The total volume of extracted aquatic organisms in III and IV zones of aquaculture of Ukraine was studied; dynamics of catches of aquatic organisms by regions and fishery zones on the territory of Ukraine; the structure of fishing by regions in the inland waters of Ukraine is analyzed; the leading representatives of catches in inland waters of Ukraine by regions were identified. Considering the dynamics of catches of aquatic organisms in inland waters from 2005 to 2020, it was found that production decreased significantly in almost all Ukraine regions and some regions decreased to almost zero. Studies have shown that the total production of aquatic bioresources in 2005 amounted to 42.364 tons, in 2010 – 37.615 tons, in 2015 – 35.985 tons, in 2020 – 22.267 tons. In all periods, leaders among the production in inland waters are Odesa and Cherkasy regions. Comparing the data for 2005 and 2020, it can be seen that catches have almost halved. It is established that, according to the analysis, the main representatives of the caught ichthyofauna are: grass carp, carp, crucian, bream, silver carp, ram, pike perch, pike, perch, catfish. The structure of catches for the whole period remains almost unchanged. The largest catches (2019) are: carp – 1704 tons; silver carp – 675 tons Sumy region; crucian carp – 398.8 tons; ram (flat) – 364.5 tons Kyiv region. The main species found in the catches of other regions are – the Volyn region – carp (237 tons), Zhytomyr region – silver carp (300 t), Lviv region – carp (499 tons), Rivne region – carp (134 tons), Ternopil region – carp (342.4 tons), Khmelnytsky region – carp (279.2 tons), Chernihiv region. – carp (352.8 t). Pike, grass carp, and catfish were the least caught in the whole territory of Ukraine. It should be noted that several factors that affect fish stocks of inland waters, and consequently catches, most often consider the impact of environmental factors, destruction and inefficiency of spawning grounds, age and sex structure of populations, poaching, etc.
38
Yanish, Yevheniia Yur'evna. "RESULTS TAXONOMIC DESIGNATION FISH REMAINS FROM EXCAVATIONS OF ARCHAEOLOGICAL BAIBEK SITE 2013". Samara Journal of Science 3, n. 3 (18 luglio 2014): 220–23. http://dx.doi.org/10.17816/snv20143225.
Testo completoAbstract (sommario):
Iichthyological materials, represented in the article, had been received from field investigations in Neolithic Baibek settlement in 2013 year. In total we investigated 310 fragments of fish, 8 species identified representatives: stellate sturgeon ( Acipenser stellatus ), sterlet ( Acipenser ruthenus ), common carp ( Cyprinus carpio ), bream ( Abramis brama ), zander ( Sander lucioperca ), perch ( Perca fluviatilis ), pike ( Esox lucius ) and catfish ( Silurus glanis ). The results of reconstruction of size, weight and age of the fish is represented in the article. A significant percentage of small-sized fish (70.5%) may indicate lack of food resources in the settlement during the studied period, and species composition suggests year-round fishing , the most actively carried out in the spring and spring-summer period.
39
Currie, R. I. "Introduction: early investigations in the Rockall Channel". Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences 88 (1986): 1–3. http://dx.doi.org/10.1017/s0269727000004425.
Testo completoAbstract (sommario):
It seems probable that the existence of Rockall has been known for a very long time but the first recorded landing we have is of a party from H.M.S. Endymion, with Lt Basil Hall, in 1811 (Fisher 1956). Records at that time of good fishing in its vicinity are frequent but the true extent of Rockall Bank was not known until 1831 when it was surveyed by Captain Alexander Thomas Emeric Vidal on H.M.S. Pike (Wigley 1831). The tiny prominence of rock bore little relation to the enormous extent of the shallow bank from which it protruded above the waves, more often than not, because of its white cap, mistaken for a ship under sail.
40
Järvet, Arvo. "Influence of Hydrological Conditions on the Ecological State of Shallow Lake Vörtsjärv". Geografie 109, n. 2 (2004): 129–44. http://dx.doi.org/10.37040/geografie2004109020129.
Testo completoAbstract (sommario):
Lake Vörtsjärv as a very shallow (mean depth 2.8 m) water-body and considerable water level fluctuations cause changes in both the surface area and volume of the lake. Due to the shallowness of the lake, low level periods are accompanied by several phenomena detrimental to its ecosystem, like cyanophyte blooms, overgrowing with macrophytes, resuspension of phosphorous compounds, restricted spawning places for pike and winter fish kills. In the years of low water level the perspectives to catch in established fishing sites using particular gear as well as access to harbours are hindered. Causal relations between the water regime and ecological state of the lake Vörtsjärv have been discussed in this paper.
41
Hs, Dian Sutono, Dendi Haris, Robet Perangin-angin, Untung Prasetyono e Maman Hermawan. "Komposisi dan Frekuensi Kemunculan Jenis Ikan Hasil Tangkapan Bagan Tancap di Tengkolak, Desa Sukakerta, Kabupaten Karawang, Jawa Barat". Barakuda 45: Jurnal Ilmu Perikanan dan Kelautan 3, n. 2 (30 novembre 2021): 51–59. http://dx.doi.org/10.47685/barakuda45.v3i2.167.
Testo completoAbstract (sommario):
One of the capture fisheries activities in Tengkolak, Sukakerta Village, West Cilamaya District, Karawang Regency, West Java Province is using the stationery lift nett. The operation of the stationery lift nett itself cannot be separated from fishing aids that use light to attract the fish that are phototaxis positive. The purpose of this study was to determine the composition of the catch and to determine the number of catches based on the stationery lift nett in the waters of Karawang Regency. The benefits of this research can provide benefits to the lift net fishermen in the waters of Karawang Regency and become a reference for policy makers in the local area. Research data collection was carried out on a stationery lift nett operating in the waters of Karawang Regency, West Java. The implementation of the research stationery lift nett in March – May 2021. Sampling was carried out randomly every day based on ships that carried out fishing operations for 38 days, by collecting data on catches directly in the field, both the same and different fishing gear. It was obtained during the research that the fish caught in the stationery lift nett consisted of 9 fish speciess, consisting of anchovies, squid, acetes, sea-pike, dorab wolf, ninis, pony fishes, semadar and yellow-strips trevally. The catch was dominated by rebon (9,650 kg/45.34 %), while the highest frequency of occurrence was anchovy (100%).
42
Kurzhykayev, Zhumagazy, Kuanysh Syzdykov, Ainur Assylbekova, Dinara Sabdinova e Viktor Fefelov. "Actual status of fishing reserves of the Yesil River". Zoologia 36 (3 ottobre 2019): 1–9. http://dx.doi.org/10.3897/zoologia.36.e30437.
Testo completoAbstract (sommario):
In this article, the study and prediction of the state of fish resources in the Yesil River was carried out to determine the boundary reference points of the reserve and management decisions in case they are exceeded, to ensure sustainable fisheries and preserve biological diversity. Ichthyological studies, retrospective analyses and rankings of the effects of the water supply of the Yesil River on fish stocks have been carried out, critical values of the biomass of fishing reserves have been determined, as criteria for biologically safe fishing values and targets for management of fish stocks at reaching the boundary values of 24.03 tonnes have been established. According to the results of studies of basic biological indicators, it was determined that roach, bream, pike and perch populations each had an LC50 above LM50, which indicates their low utilization in the fishery industry. A strategy for management of fish stocks, recommendations for the conservation of fishery resources and their rational use has been developed as a result of these findings. The list and status of the monitored indicators for the careful management of fish stocks, as well as a list and indicators of the boundary indicators for the state of fish stocks, was established. These parameters included the fish size of 50% of the sampled fish and 50% of maturity achieved, where the LC50 was observed in the fish in question from 19 to 45.4 cm and LM50 from 12.3 to 41 cm, respectively. The minimum and maximum river levels that ranged from 111 up to 159 cm, as well as the critical value of the commercial reserve, corresponded to the boundary value of 24.03 tonnes. The results of this work will serve as the basis for making future managerial decisions, necessary for sustainable fisheries and conservation of the biological diversity of the Yesil River.
43
Kutsenko, Nikolai Vladimirovich, Yulia Nikolaevna Grozesku e Anton Alexeyevich Filipenko. "Comparative assessment of amateur fishing influence on water bioresources of Lake Tsatsa in Volgograd region". Vestnik of Astrakhan State Technical University. Series: Fishing industry, n. 4 (30 dicembre 2021): 57–62. http://dx.doi.org/10.24143/2073-5529-2021-4-57-62.
Testo completoAbstract (sommario):
The paper presents the results of research conducted in 2020 on the impact of amateur fishing on the aquatic bioresources of Lake Tsatsa, which is part of the Sarpin Lakes located in the Volgograd region. On the basis of field studies (direct accounting), the number of amateur fishermen who visited the lake, as well as the qualitative and quantitative composition of their catches, was established. According to the data obtained, the total catch of fish by amateur fishermen, as well as the average catch per fisherman, was estimated. The size and weight composition of amateur fishing catches was determined based on the analysis of 2912 fish species. During the observation period 9 fish species were marked as part of amateur fishermen’s catches. The assessment of compliance of aquatic biological resources catch by amateur fishermen with the norms of the current Fishing Regulations was carried out. An assessment of the scale of amateur fishing impact on the aquatic bioresources of Lake Tsatsa is given, according to the analysis of the collected data. The catch of amateur fishermen in 2020 in Lake Tsatsa is amounted to 8.8232 tons, which can
account for up to 15% (about 65-70 tons) of the total stock of commercial fish species in the lake. The forecast values of the production volume for industrial fisheries, for which the total allowable catch (TAC) is established and the species for which the recommended catch is determined, are 5.9 and 18.6 tons, respectively. Out of the forecast volumes amateur fishermen additionally catch fish species for which the total allowable catch (TAC) is established (carp, bream, pike)
in the amount of 2.858 tons, and species for which the recommended catch value is determined as 5.643 tons.
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Zakh, Viktor Alekseevich. "Fishery in the Tobol-Ishim interfluve in the neolithic and early metal age". Samara Journal of Science 7, n. 4 (30 novembre 2018): 182–92. http://dx.doi.org/10.17816/snv201874205.
Testo completoAbstract (sommario):
Landscapes of the Tobol-Ishim interfluve were not stable in the Holocene and varied from forests and drowned floodplains at the beginning of the V and III millennia BC to steppificated territories with a lowered water level at the beginning of the Atlantic Period and in the middle of the Subboreal Period, which determined the main types of economic activities, one of them was fishing. Changes in hydrological regime of water bodies influenced the methods of fishing, including the use of different traps. Thus, in the Neolithic, when the water level decreased, the location of settlements in the system river-creek-lake (for example, Mergen 6), a large number of fish bones, bone harpoons, fishing spears, fishing tackles for catching pike and a total absence of plummets were indicative of individual fishing for large fish and, perhaps, of stop net fishery, which was facilitated by a decrease in the width of watercourses and tombolos. Stop net (stake net) fishery led to a settled lifestyle of the population, collective activities and the emergence of long-term settlements with deep foundation pits of dwellings. When the water level in rivers and lakes increased and floods became more frequent, the life support system changed, the population began to develop coasts more widely, its mobility increased, and they started to build framed above-ground dwellings. Following those changes, biconic, cigar-shaped, and corniculate plummets emerged in the Tobol River Basin and on the adjacent western and north-western territories in the III and early II millennium BC. When the water level was high, it was efficient to fish using traps, seines and, probably, nets, although the latter could also be used in drive hunting for shedding geese and ducks. Subrectangular plummets with one or two ties for fastening, and disk-shaped plummets with a tie in the center had been prevailing since the beginning of the II millennium BC; they existed until the first third of the I millennium BC. This period, the transition time from the Bronze Age to the Early Iron Age, is characterized by the absence of clay plummets, while there are large accumulations of fish scales and bones in the settlement layers. We can suppose that the population of that time (local Late Bronze Age population, mixed with northern migrants who made utensils with cross ornamentation) switched from net fishing to stop net fishing.
45
Dvoryankin, Gennady. "BIOLOGY, ECOLOGY AND FISHERY VALUE OF RIVER PERCH (PERCA FLUVIATILIS (L.)) OF THE KENOZERSKY NATIONAL PARK". Vestnik of Astrakhan State Technical University. Series: Fishing industry 2021, n. 1 (17 marzo 2021): 24–30. http://dx.doi.org/10.24143/2073-5529-2021-1-24-30.
Testo completoAbstract (sommario):
The article describes the habitat and behavior of the river perch (Perca fluviatilis L.), which dominates the reservoirs of the Kenozero National Park (KNP). It is not found only in the dystrophic crucian lakes. In its habitats, perch is also one of the most numerous species and, as
a result, an important object of recreational fishing. There are presented the results of studying perch populations in the main fishery reservoirs of the KNP obtained in 2007-2019 in the course of author's research. The information about biology, ecology and abundance of perch is given. The stock status and the role that perch plays in the life of the local population as an aquatic biological resource have been determined. In the aquatic ecosystems of Park's lakes perch was stated the dominant and healthy species. Its most numerous populations live in the large KNP lakes - Kenozero and Lekshmozero. These are the main fishery reservoirs of the Park, where more than 95% of all fish is caught. Perch here takes 3-4 place among all the caught fish species. In 2019 its share in the total fish catch in Kenozero and Lekshmozero, according to official statistics, made 14%. In general, perch in the national Park is second only to vendace and pike in the commercial importance. And in the winter, perch is the main object of ice fishing.
46
de Moraes, Karlos R., Allan T. Souza, Daniel Bartoň, Petr Blabolil, Milan Muška, Marie Prchalová, Tomáš Randák et al. "Can a Protected Area Help Improve Fish Populations under Heavy Recreation Fishing?" Water 15, n. 4 (6 febbraio 2023): 632. http://dx.doi.org/10.3390/w15040632.
Testo completoAbstract (sommario):
Freshwater protected areas are designated parts of the inland waters that restrict human activities. They were created as a mechanism to combat the decline of fauna and flora of the world. Some authors have questioned their actual effectiveness in terms of the purpose of protecting endangered fauna and flora. We conducted an experiment in Lipno reservoir in the Czech Republic to evaluate the impact of protection against angling pressure on the fish community. We selected data from two years of gill netting and analyzed the difference between areas of low anthropogenic impact (LAI) and those of high anthropogenic impact (HAI) in terms of abundance, biomass, standard length, and diversity indices. Three groups of fish were found to prefer protected areas with low anthropogenic pressure: 1. YOY (Young-of-the-year) perch (Perca fluviatilis), the dominant of the young-of-the-year fish community. 2. Pike (Esox lucius), wels catfish (Silurus glanis) and rudd (Scardinius erythrophthalmus), which were not found in HAI areas at all. 3. Larger individuals of pikeperch (Stizostedion lucioperca), which survived better in LAI areas. Some factors may affect LAI, such as illegal poaching or setting out food bait to attract the fish outside. Another factor that can be considered is the migration of fish, either to forage or to reproduce, since the LAI areas are open to the reservoir. The areas of LAI act as protective habitats for heavily exploited predatory fish species and increase fish diversity indexes. The example of the protected and low-impact areas of Lipno should be followed in other water bodies with high fishing pressure and anthropogenic impact.
47
Treer, Tomislav. "Trends in Total Anglers’ Catches At the Croatian Section of the Sava River Basin". Croatian Journal of Fisheries 80, n. 2 (1 giugno 2022): 97–101. http://dx.doi.org/10.2478/cjf-2022-0010.
Testo completoAbstract (sommario):
Abstract The aim of this research is to analyse trends of anglers’ total catches of the most important fish species caught by angling in different parts of the Sava River Basin in Croatia (Cyprinus carpio, Silurus glanis, Esox lucius and Sander lucioperca). In all investigated counties, with the exception of Vukovar-Sirmium, common carp is the dominant fish species, usually present in significantly higher quantities compared to the other three species. Only in Vukovar-Sirmium county, northern pike is the dominant species caught. In most counties there are no dramatic changes in the catches of these four fish species, apart from the usual oscillations. Due to high fishing pressure and possibly inflow of polluted water from the Bosna River, Vukovar-Sirmium county is also particularly characterised by the trend of declining catches of all four species. The significant negative correlation between the average catch and the respective value of the coefficient of variation (CV) was also found for all data.
48
Forbes, Stephen A. "Studies of the food of Fresh Water Fishes". Illinois Natural History Survey Bulletin 2, n. 1-8 (22 maggio 2019): 433–73. http://dx.doi.org/10.21900/j.inhs.v2.91.
Testo completoAbstract (sommario):
The cod family is represented in Illinois by only a single species, the burbot (Lota maculosa), occurring in the interior of Lake Michigan, and making its way at irregular intervals to the shallow waters within the reach of ordinary fishing operations. Since the opening of canals between the Great Lakes and the river systems of the State, occasional specimens have been taken in the Illinois and Mississippi. Its predaceous character is too well known to make special description of its alimentary structures necessary. It is reported by Mr. G. Brown Goode to feed upon various small fishes and Crustacea which frequent the bottom, devouring more particularly fishes with habits like its own. It is extremely voracious, with a wonderfully distensible stomach; and not only captures the most active fishes, such as the pike, but will eat carrion, and may even swallow stones. It is reported to be nocturnal in habit, and often to secure its prey by stealth.
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Biernaczyk, Marcin, Konrad Wrzecionkowski, Arkadiusz Nędzarek e Katarzyna Stepanowska. "Evaluation of the Composition of Ichthyofauna in Lakes Free from Commercial Use in a Tightly Protected Area of the Wolin National Park (Poland)". Water 13, n. 18 (15 settembre 2021): 2530. http://dx.doi.org/10.3390/w13182530.
Testo completoAbstract (sommario):
The ichthyological biodiversity of Polish lakes is poorly understood, even in lakes not used for fishing and those under strict protection. With this in mind, the aim of this study was to conduct a comprehensive ichthyological survey of several lakes in the Wolin National Park (Poland). The study was conducted in Domysławskie and Gardno lakes and the anthropogenic Stara Kredownia reservoir. Each fishing exercise was conducted using benthic nets over a 12 h period. The fish caught were measured and weighed, and the species identified. Shannon-Wiener (H) and Simpson biodiversity indices were determined. The catch comprised a total of 4580 fish (of which 4391 were caught in Domysławskie Lake) belonging to 15 species, with a combined weight of 98,165 g. In general, the most prevalent species were non-predatory fish: roach (Rutilus rutilus), freshwater bream (Abramis brama), white bream (Blicca bioerkna), bleak (Alburnus alburnus), and rudd (Scardinius erythrophthalmus). Individually, perch (Perca fluviatilis) and roach (Rutilus rutilus) were the most abundant species. Ichthyofauna diversity varied greatly between the studied water bodies, with 15 species found in Domysławskie Lake and only 6 species in Gardno Lake. In Stara Kredownia Reservoir, no fish were caught, but amphibians were observed, such as great crested newts (Triturus cristatus) and common newts (Lissotriton vulgaris). Based on the results obtained, Lake Domysławskie had a higher species ichthyofauna diversity than the other ‘tench and pike’ lakes. Gardno Lake had a much lower biodiversity.
50
Dorogin, M. A., L. S. Vizer, T. A. Balatskaya e Yu V. Sharukha. "Assessment of the state of aquatic bioresources and the feasibility of involving floodplain lakes of the Ob river in the upper reaches of the Novosibirsk hydroelectric power station in fishing". Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries), n. 1 (16 gennaio 2023): 31–41. http://dx.doi.org/10.33920/sel-09-2301-03.
Testo completoAbstract (sommario):
An overview of typical lakes of the floodplain system of the river is presented. Ob in the upper reaches of the Novosibirsk hydroelectric power station. Data on the species structure, abundance and biomass of zooplankton, zoobenthos and fish are presented. Most of the lakes of the left-bank floodplain of the Ob have an elongated channel-like shape and a constant hydrological connection with the channels of the Ob river. The lakes are located in a low floodplain and are completely flooded by flood waters even in low-water years. The area of the lakes does not exceed 40 hectares. The zooplankton of the lakes is represented by 16 species, the total number varied from 360 copies/m3 (lake Epanchino) to 36 530 copies/m3 (lake Komendantskoye), the biomass was 13.8–229.0 mg/m3. According to the development of zooplankton, all the floodplain lakes studied belong to low-feeding, ultra-oligotrophic type reservoirs, the lowest productivity class. 13 species were found in the zoobenthos of floodplain lakes, the total number varied from 172 specimens/m2 (lake Chernoe) to 860 specimens/m2 (lake Baigachevskoe), biomass — from 0.513 to 4.196 g/m2. On the development of zoobenthos lake. Epanchino refers to medium–fed, mesotrophic type reservoirs, the other three — to low-fed, oligotrophic type reservoirs, low productivity class. The main species of ichthyofauna of floodplain lakes are pike (Esox lucius Linnaeus), river perch (Perca fluviatilis Linnaeus) and silver carp (Carassius gibelio Bioch). Pike at the age of 3+ — 4+ years dominates in lake populations, perch — 2+ years. The biomass of the ichthyofauna is 15,3–45,8 kg/ha. According to the ichthyomass, floodplain lakes of the lower reaches belong to the oligotrophic and mesotrophic type of reservoirs, low and medium productivity class.