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Journal articles on the topic 'Fishing nets'
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Sindha, Pradhyuman, Raju Vyas, and Vishal Mistry. "Entanglement in fishing nets." Reptiles & Amphibians 26, no. 3 (January 1, 2020): 248–49. http://dx.doi.org/10.17161/randa.v26i3.14427.
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Servalli, Marco, Hans Christian Öttinger, and A. Dieter Schlüter. "Synthesizing molecular fishing nets." Physics Today 71, no. 5 (May 2018): 40–47. http://dx.doi.org/10.1063/pt.3.3921.
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M. Affan, Junaidi. "IDENTIFIKASI ALAT BANTU PENANGKAPAN IKAN PADA BAGAN APUNG DI PERAIRAN KRUENG RAYA." Jurnal Sains Riset 8, no. 2 (March 18, 2019): 40–45. http://dx.doi.org/10.47647/jsr.v8i2.40.
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Lift-nets is one of the important fisheries sectors that become the source of coastal comunity livelihood in Krueng Raya, Aceh Besar. The operation of the fishing gear is always supported by the fishing tools that can assist the operation process, as well as the lift-nets that exist in the Krueng Raya area. The main fishing tools on the lift-nets in Krueng Raya are lights, generator and roller. The lack of data and information on the characteristics of fishing equipment becomes an obstacle to improve the development of lift-nets. This study aims to identify fishing equipment used in lift-nets at Krueng Raya. The data were collected by interviewed and directed field observation. Descriptive analysis showed the fishing equipment used in lift-nets in Krueng Raya used neon and mercury lamps, the generator capacity is 15000 watts and roller made of bayur wood (Pterospermum javanicum). The updates of the fishing equipment used in lift-nets at Krueng Rayacan still be made.
Kata kunci: Krueng Raya, Lift Net
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Alıçlı, Tuğrul Zahit. "The fishing potential of Marmara Ereglisi (Tekirdag) and fishing gear used in small-scale fishing activities." Aquatic Research 7, no. 2 (2024): 105–20. http://dx.doi.org/10.3153/ar24010.
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The study aims to determine the technical characteristics of fishing gear used in the small-scale fishery in Marmara Ereglisi and to give the fishing potential of Marmara Ereglisi. The study was conducted during the 2022-2023 fishing season at the Marmara Ereglisi fishing shelter. Our results are based on the surveys conducted with 14 commercial fishermen and personal observations. Accordingly, 15 different set nets (9 gill nets and 6 trammel nets), five different fishing lines, and 1 type of beam trawl were identified. In the small-scale fishing activity in Marmara Ereglisi, 38 other fish species (13 target and 36 non-target) were caught. This study concludes that small-scale fishing in Marmara Ereglisi has significant potential in the fishing gear used and the species seen. The study is the first to focus on the technical specifications of fishing gear used in Marmara Ereglisi.
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Yanti, C. W., R. Metalisa, L. Bathara, and V. B. Saragih. "Income Contribution Based on Fishing Gear of The Duano Tribe, Indragiri Hilir, Riau." IOP Conference Series: Earth and Environmental Science 1118, no. 1 (December 1, 2022): 012077. http://dx.doi.org/10.1088/1755-1315/1118/1/012077.
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Abstract The Duano Tribe are fishermen that run fishing businesses traditionally. Generally, they use longlines and drift gill nets equipment for fishing. The purpose of this research is to analyze the income of fishermen that use longlines and drift gill nets based on the main catch of Belanak and Senangin fish and the contribution of fishing business income to the total fisherman income. The descriptive method that the author used to analyze where data were collected from 29 fishermen of Duano Tribe. This research was conducted in Tanjung Pasir village, Indragiri Hilir, Riau, in May 2021. The result shows that the average fishing income of Duano Tribe that use longlines is IDR.51,782,948.-year-1 and the average fishing income of Duano Tribe that uses drift gill nets is IDR.26,931,235.-year-1. The income of the Duano tribe using longlines is higher than drift gill nets, even with the same average duration of fishing. The contribution of income using longlines to the income of the Duano Tribe fishermen is 85 percent, and the contribution of income using drift gill nets to the income of the Duano Tribe fishermen is 78 percent. The income contribution using longline is higher than the income contribution using drift gill nets. Based on the contribution criteria, both income from fishing with drift gill nets and longlines provide a high contribution.
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Nuanzha, Sissy Femi, Zamdial Zamdial, and Dede Hartono. "Analysis of Environmentally Friendly Fishing Equipment in Pasar Bantal Village Teramang Jaya District Mukomuko Regency." Jurnal Kelautan dan Perikanan Indonesia 2, no. 3 (December 31, 2022): 171–81. http://dx.doi.org/10.24815/jkpi.v2i3.28690.
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Environmentally friendly fishing gear is a fishing gear that does not have a negative impact on the environment, such as not damaging the bottom of the water. There are 4 fishing gears that are often used by the people of Pasar Pillow Village, Teramang Jaya District, namely longline fishing rods, shrimp trawls, millennium nets and nylon nets. Research on the analysis of environmentally friendly fishing gear was carried out in April – May 2022 in Pasar Pillow Village, Teramang Jaya District, Mukomuko Regency. This study aims to analyze environmentally friendly fishing gear (API) in Pasar Pillow Village, Teramang Jaya District, Mukomuko City. The method used is the survey method. Collecting data using observation, interviews and documentation methods. The results of the research data were analyzed by descriptive method. The categories of environmentally friendly fishing gear used by Pillow Market fishermen are longline fishing rods, nylon nets, and millennium nets. The fishing gear that is not environmentally friendly is the shrimp trawl.Keywords: Fishing gear, environmentally friendly, Pasar Bantal Village, Mukomuko
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Juan, Rafael, Carlos Domínguez, Nuria Robledo, Beatriz Paredes, Sara Galera, and Rafael A. García-Muñoz. "Challenges and Opportunities for Recycled Polyethylene Fishing Nets: Towards a Circular Economy." Polymers 13, no. 18 (September 17, 2021): 3155. http://dx.doi.org/10.3390/polym13183155.
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Plastic waste generation has become an important problem that critically affects marine and oceans environments. Fishing nets gear usually have a relatively short lifespan, and are abandoned, discarded and lost, what makes them one of the largest generators of ocean plastic waste. Recycled polyolefin resins from fishing nets (rFN), especially from polyethylene (PE), have poor properties due to the presence of contaminants and/or excessive degradation after its lifetime. These reasons limit the use of these recycled resins. This work aims to study the incorporation of recycled fishing nets PE-made to different grades of virgin PE, in order to evaluate the potential use of these rFN in the development of new products. The recovered fishing nets have been fully characterized to evaluate its properties after the collection and recycling process. Then, different PE virgin resins have been mechanically blended with the recovered fishing nets at different recycling contents to study its feasibility for fishing nets or packaging applications. Critical mechanical properties for these applications, as the elongation at break, impact strength or environmental stress cracking resistance have been deeply evaluated. Results show important limitations for the manufacture of fibers from recycled PE fishing nets due to the presence of inorganic particles from the marine environment, which restricts the use of rFN for its original application. However, it is proved that a proper selection of PE raw resins, to be used in the blending process, allows other possible applications, such as non-food contact bottles, which open up new ways for using the fishing nets recyclates, in line with the objectives pursued by the Circular Economy of Plastics.
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Hu, Fuxiang. "Similarity Laws for Fishing Nets." NIPPON SUISAN GAKKAISHI 65, no. 5 (1999): 923–24. http://dx.doi.org/10.2331/suisan.65.923.
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Gaudenzi, Germano, Silvia Carra, Alessandra Dicitore, Maria Celeste Cantone, Luca Persani, and Giovanni Vitale. "Fishing for neuroendocrine tumors." Endocrine-Related Cancer 27, no. 6 (June 2020): R163—R176. http://dx.doi.org/10.1530/erc-19-0437.
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Neuroendocrine tumors (NETs) are a class of rare and heterogeneous neoplasms that originate from the neuroendocrine system. In several cases, these neoplasms can release bioactive hormones leading to characteristic clinical syndromes and hormonal dysregulations with detrimental impact on the quality of life and survival of these patients. Only few animal models are currently available to investigate pathogenesis, progression and functional syndromes in NETs and to identify new therapeutic strategies. The tropical teleost zebrafish (Danio rerio) is a popular vertebrate model system that offers unique advantages for the study of several biological processes, ranging from embryonic development to human diseases such as cancer. In this review, we summarize recent advances on zebrafish models for NET preclinical research that take advantage of modern genetic and transplantable technologies. In the future, these tools may have a role in the treatment decision-making and tertiary prevention of NETs.
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Arisandi, Arisandi. "INKONSISTENSI KEBIJAKAN PENGGUNAAN JARING TRAWL (Studi Kasus Penggunaan Jaring Trawl Oleh Nelayan Wilayah Perairan Gresik)." JKMP (Jurnal Kebijakan dan Manajemen Publik) 4, no. 1 (July 27, 2016): 1. http://dx.doi.org/10.21070/jkmp.v4i1.195.
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This study aimed to determine the shape of inconsistency of utilization trawl nets policy in Gresik Regency. This research used descriptive qualitative. Sources of data is collected primary data through interview that is submitted to the Kasat Polair Polres Gresik, Kaur Binops Satpolair Polres Gresik, Kanit Gakkum Satpolair Polres Gresik and those involved in illegal fishing. The research showed that (1) fishing in using trawl nets as habit in one of areas in the waters Gresik, so Regulation of Marine and Fisheries Ministry Number 2 on 2015 of Prohibition of Utilization Hela Trawl Fishing Equipment and Trawl Drag (Seine Nets) in Republic Indonesia Water in accordance with mandate on the article 9 of Law Number 45 of 2009 to be less impact on the reduction of fishing in using trawl nets. (2) The government's attitude did not tight; it is caused incosistency towards prohibition on the use of trawl nets in fishing effort in the territorial waters Gresik. Although it has been banned, but in the end the government in this regard as relented and eventually tolerate even within certain time limits. (3) The fact, incosistency made it difficult taking firm steps to follow up on illegal fishing violations that occurred in the waters of Gresik
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Dudley, S. F. J., R. C. Haestier, K. R. Cox, and M. Murray. "Shark control: experimental fishing with baited drumlines." Marine and Freshwater Research 49, no. 7 (1998): 653. http://dx.doi.org/10.1071/mf98026.
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Protective gill-nets (shark nets) have been successful in reducing the frequency of shark attacks on the coast of KwaZulu-Natal (KZN), South Africa, since 1952. This is achieved primarily through a local reduction in numbers of large sharks. Yet the nets are non-selective in terms of shark species caught and take a by-catch of dolphins, sea turtles, batoids and teleosts. Baited lines, or drumlines, as used in the Queensland shark control programme, were tested as possible alternatives to gill-nets. They demonstrated greater species selectivity for sharks and also a reduced by-catch of non-shark animals. The shark catch included the three species responsible for most shark attacks on the KZN coast, Carcharhinus leucas, Galeocerdo cuvier and Carcharodon carcharias. The probability of the bait being scavenged, or a shark being caught, was modelled in relation to a number of physical environmental factors. Although there was insufficient variability in the effort data for a quantitative comparison of catch rates between nets and drumlines, the results suggested that an optimal solution may be to deploy a combination of nets and drumlines.
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Syafril, Muhammad, Elly Purnamasari, and Dayang Diah Fidhiani. "Analisis kelayakan finansial usaha perikanan tangkap di Kampung Gurimbang Kecamatan Sambaliung Kabupaten Berau." AGROMIX 13, no. 1 (March 31, 2022): 55–66. http://dx.doi.org/10.35891/agx.v13i1.2913.
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Introduction: This study aims to measure the productivity and financial viability of the capture fisheries business in the Berau sea, which is managed by the local community of Gurimbang Village. Methods: The research was conducted in the Gurimbang Village, Sambaliung District, Berau Regency, in June-December 2020. Data analysis used financial analysis and descriptive analysis. Result: The results showed that there were fishing with fishing gear and fishing business with fishing gear 2 types of marine fisheries managed by fishermen in this village, namely, fishing nets and nets. The total income of fishing rods per trip ranges from IDR 579,580-1,804,094 with an average of IDR 863,526.34/fisherman. The income productivity of fishing rods is IDR 82,797-128,173 with an average of IDR 103,589/fisherman every day. Net and net fishermen generate income per activity trip in the range of IDR 468,612-708,929 with an average per fisherman of IDR 570,602.24, while the productivity of their income is IDR 117,153-177,232 with an average of IDR 142,651/fisherman every day. Both types of business are financially feasible to be managed as the main livelihood. Capture fisheries business managed by fishing rods produces an NPV value of IDR 102,822,888, an IRR value of 261%, Net B/C value of 9.42, Payback Value of 0.55 years and ROI of 188.44%. Fishery business with fishing gear and nets produces an NPV of IDR 81,605,621, IRR of 154%, Net B/C of 6.41 and an ROI of 128%. Conclusion: Capture fisheries business in Gurimbang village, using fishing rods, nets and nets, is financially feasible using the discounted investment criteria (NPV, IRR, Net B/C, Payback Period).
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Ernawaty Putri Elisabet Siburian and Dyah Setyorini. "TINJAUAN YURIDIS PENANGKAPAN IKAN TANPA SIPI DAN MENGGUNAKAN JARING TRAWL." Reformasi Hukum Trisakti 4, no. 4 (November 9, 2022): 941–47. http://dx.doi.org/10.25105/refor.v4i6.15002.
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Every fishing activity in the water area of the Republic of Indonesia must have a permit and meet the requirements for the use of fishing nets as regulated in the Regulations. This research discusses Fishing without SIPI. This research is normative and descriptive analytical legal research, using secondary data obtained through library research. The data is analyzed qualitatively and the conclusions are drawn using deductive logic. The conclusion from this research is the fishing by Sugianto did not use SIPI and violated article 27 paragraph (1) Law Number 45/2009 from Law Number 31/2004 concerning fishery and Sugianto also using nets in the form of Trawls Nets. On the other hand the actions he did categorized as Illegal Fishing.
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Kozioł, Anna, Kristofer Gunnar Paso, and Stanisław Kuciel. "Properties and Recyclability of Abandoned Fishing Net-Based Plastic Debris." Catalysts 12, no. 9 (August 26, 2022): 948. http://dx.doi.org/10.3390/catal12090948.
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Plastics in marine environments undergo molecular degradation via biocatalytic and photocatalytic mechanisms. Abandoned, lost, or discarded fishing gear (ALDFG) damages marine and coastal environments as well as plant and animal species. This article reviews ghost fishing, ecological damage from marine plastics, recommended recycling practices and alternative usages of derelict fishing gear. Material mixing techniques are proposed to counteract the effect of biocatalytic and photocatalytic biodegradation within the context of plastic fish net recycling. There is a need for a new and rapid “multidimensional molecular characterization” technology to quantify, at a batch level, the extent of photocatalytic or biocatalytic degradation experienced on each recovered fishing net, comprising molecular weight alteration, chemical functional group polydispersity and contaminant presence. Rapid multidimensional molecular characterization enables optimized conventional material mixing of recovered fishing nets. In this way, economically attractive social return schemes can be introduced for used fishing nets, providing an economic incentive for fishers to return conventional fishing nets for recycling.
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Amarullah, Teuku, Syarifah Zuraidah, Era Marjisa, and Uswatun Hasanah. "ANALISIS PENDAPATAN NELAYAN TRADISIONAL DENGAN MENGGUNAKAN ALAT TANGKAP UDANG LIFT NETS (Ali) DI KECAMATAN ARONGAN LAMBALEK KABUPATEN ACEH BARAT." BIOTIK: Jurnal Ilmiah Biologi Teknologi dan Kependidikan 8, no. 2 (January 7, 2021): 160. http://dx.doi.org/10.22373/biotik.v8i2.8193.
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Capture fisheries is a source of livelihood for fishermen. Fishers in Arongan Lambalek are still classified as traditional fishermen and still use simple fishing gear in their operations. One of the fishing gear used is Lift Nets (Ali) fishing gear to catch shrimp. This study aims to determine the income of traditional fishermen using Lift Nets (Ali) fishing gear in Arongan Lambalek District, West Aceh Regency. This research was conducted from June to July 2020. The data collection method was purposive sampling method with 20 respondents. The analyzes used total cost, total beneficiary, profit and RCR. The results showed that, the amount of catch of fishermen using Lift Nets (Ali) fishing gear in Arongan Lambalek District was 2.872 kg / month with an average of 144 kg / month / fisherman, the total cost of 20 fishermen was Rp. 24.540,278 with an average total cost of Rp.1.227,013 months / fisherman, the amount of revenue from 20 fishermen is Rp.73.235,000 / month with an average income of Rp. 3.661,750 months / fisherman and income from 20 fishermen is Rp.48.694.722 / month and the average income of fishermen is Rp.2.434.736 / month and the average RCR of Rp.2.98 months / fisherman, which means RCR> 1, then traditional fishing business using Lift Nets (Ali) fishing gear is feasible.
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Kaiser, MJ, B. Bullimore, P. Newman, K. Lock, and S. Gilbert. "Catches in 'ghost fishing' set nets." Marine Ecology Progress Series 145 (1996): 11–16. http://dx.doi.org/10.3354/meps145011.
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Sansom, Clare. "FISHing for aneuploidies nets accurate results." Molecular Medicine Today 6, no. 1 (January 2000): 1. http://dx.doi.org/10.1016/s1357-4310(99)01628-7.
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Weyrich, Andrew S., and Guy A. Zimmerman. "Comparative genomics: fishing nets hemostatic catch." Blood 113, no. 19 (May 7, 2009): 4479–80. http://dx.doi.org/10.1182/blood-2009-02-203117.
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Yusfiandayani, Roza, Ari Purbayanto, and Ba’diah Nuraini. "Produktivitas dan Pola Musim Tangkap Ikan Peperek (Leiognathus spp.) di Teluk Banten." Jurnal Ilmu Pertanian Indonesia 28, no. 3 (May 26, 2023): 457–64. http://dx.doi.org/10.18343/jipi.28.3.457.
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Ponyfish (Leiognathus spp.) is one of the dominant types of fish landed at the Nusantara Fishing Port (PPN) Karangantu. Its high-intensity fishing activities are feared to cause future problems with the sustainability of ponyfish resources. This study aims to calculate fishing productivity, sustainable optimal fishing effort, maximum sustainable catch, and determine the pattern of fishing season in Banten Bay. The research was conducted from April to June 2021 at PPN Karangantu. The fishing gear analyzed were fixed lift nets, floating lift nets, and seine nets. Fishing productivity was calculated from catch per unit effort; the maximum sustainable catch was analyzed using the Schaefer, Fox, and Walter-Hilborn regression models. The seasonal pattern of the ponies was determined from the Fishing Season Index. The results showed that pony fishing productivity in PPN Karangantu decreased from 2016 to 2020. The optimum fishing effort value and the optimum catch through the Schaefer model were 2088 trips/year and 276.12 tons/year, respectively; the highest fishing season occurred in November (145.5%) and the lowest in May (70.2%). Based on the analysis of the Schaefer, Fox and Walter-Hilborn models, the exploitation of Ponyfish (Leiognathus spp.) in Banten Bay can be said to be over-exploited.
Keywords: catching season, Banten bay, Leiognathus spp., productivity
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Yahya, Reza, Arif Mahdiana, and Muslih Muslih. "Status Perikanan Tangkap di Kabupaten Kebumen." MAIYAH 2, no. 2 (June 1, 2023): 60. http://dx.doi.org/10.20884/1.maiyah.2023.2.2.8524.
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Capture fisheries in Kebumen Regency has a large potential of fish resources. The status of capture fisheries in Kebumen Regency includes the development of the number of fishermen/RTPs, fishing vessels, fishing gear, fishing production volume, fishery production value, types and catches of fish. The results showed that Kebumen fishermen are included in the category of small fishermen based on the use of boat types less than 5 GT and outboard motorboats. The number of growth of fishermen and the number of fishing boats in Kebumen Regency increased throughout 2016-2020. Types of fishing gear used by fishermen in Kebumen district include fixed gill nets, drift gill nets, trammel nets, fishing rods and hooks. The production volume and production value of the Kebumen capture fishery decreased in 2020 due to the COVID-19 pandemic. Potential species caught by Kebumen fishermen were demersal fish with high economic value such as white pomfret (Pampus argenteus), lobster (Panulirus homarus), jerebung shrimp (Penaeus merguiensis) and red snapper (Lutjanus campechanus).
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Chen, Nuo, Jin Zhu, and Linhan Zheng. "Light-YOLO: A Study of a Lightweight YOLOv8n-Based Method for Underwater Fishing Net Detection." Applied Sciences 14, no. 15 (July 24, 2024): 6461. http://dx.doi.org/10.3390/app14156461.
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Detecting small dark targets underwater, such as fishing nets, is critical to the operation of underwater robots. Existing techniques often require more computational resources and operate under harsh underwater imaging conditions when handling such tasks. This study aims to develop a model with low computational resource consumption and high efficiency to improve the detection accuracy of fishing nets for safe and efficient underwater operations. The Light-YOLO model proposed in this paper introduces an attention mechanism based on sparse connectivity and deformable convolution optimized for complex underwater lighting and visual conditions. This novel attention mechanism enhances the detection performance by focusing on the key visual features of fishing nets, while the introduced CoTAttention and SEAM modules further improve the model’s recognition accuracy of fishing nets through deeper feature interactions. The results demonstrate that the proposed Light-YOLO model achieves a precision of 89.3%, a recall of 80.7%, and an mAP@0.5 of 86.7%. Compared to other models, our model has the highest precision for its computational size and is the lightest while maintaining similar accuracy, providing an effective solution for fishing net detection and identification.
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Wahyuningrat, Tenang Haryanto, and Slamet Rosyadi. "Practices of Illegal Fishing in Pemalang Region: A Policy Analysis." E3S Web of Conferences 47 (2018): 06010. http://dx.doi.org/10.1051/e3sconf/20184706010.
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The use of unsustainable fishing gear has resulted in the decline of fish resources and threatens the sustainability of fish resources. This can cause harm to the state and the interests of the fishermen themselves. Although various policies governing fishing gear are already in place, unsustainable fishing practices remain. This, of course, has resulted in overfishing and causing environmental damage. Using the case of fishing practices in Pemalang Region, this study found that fishing gears used by fishermen are prohibited tools because they have negative impacts on the environment. Some fishing gear is quite popular used by fishermen in Pemalang Region are stun, fishing nets, fishing rods and poison. Unfortunately, the use of electric current tool (stun) is found to be more dominant than fishing nets and fishing rods. Similarly, it has developed among fishermen to use toxic methods in fishing. This phenomenon encourages researchers to formulate an effective public policy to control and minimize illegal fishing practices.
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Buras, Paweł, and Wiesław Wiśniewolski. "Numerical Model of Fish Exploitation – structure and application." Fisheries & Aquatic Life 27, no. 2 (June 1, 2019): 86–101. http://dx.doi.org/10.2478/aopf-2019-0010.
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Abstract Fisheries simulation models are tools used for forecasting the effects of exploitation and determining the directions of managing fisheries resources. The Numerical Model of Fish Exploitation (NMFE) and its capabilities were tested on a population of common bream, Abramis brama (L.) in a dam reservoir that is exploited by commercial and recreational fisheries. Based on the designated population parameters of N0, Fij, Mi, and ei and the size and structure of the common bream population in the reservoir, the model was used to examine hypothetical simulation variants of changes in fishing intensity E1 with nets and rods, changes in fishing intensity based on actual fishing effort with nets, changes in natural mortality, changes in the size of fish caught, and the impact of this on the size of the resources. Initial catches with nets and rods were calculated. Increasing fishing effort did not translate proportionally to increased catches, and the function was curvilinear. The results of simulations that reduced the intensity of fishing with nets and decreased catch sizes concurred with data from actual catches. Simulations of changes in natural mortality had various effects on the size of catches. Reducing parameter M did not impact the level of catches, while increasing parameter M reduced the size of catches significantly.
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Skóra, Krzysztof E., and Iwona Kuklik. "Bycatch as a potential threat to harbour porpoises (Phocoena phocoena) in Polish Baltic waters." NAMMCO Scientific Publications 5 (July 1, 2003): 303. http://dx.doi.org/10.7557/3.2831.
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Sixty-two verified reports obtained in the years 1990-1999 on the bycatch, strandings and sightings of harbour porpoises in the Polish Baltic were analysed in this study. In relative terms the highest number of reports (22) was noted in Puck Bay. Forty-five (72.6%) reports referred to specimens from bycatch, 10 (16.1%) were individuals observed at sea, and 7 (11.3%) were stranded. A large proportion (42.2%) of the bycatch occurred in the fishing grounds of Puck Bay. Forty carcassesof harbour porpoises were obtained for further analysis. Most of the bycatch took place from December to April with a maximum in March. In the rest of the year there were 1 to 3 bycaught animals reported per month with no cases of bycatch in June. Taking into account data on fishing effort collected for the study area it appears that by far the greatest threat to harbour porpoises is posed by nets used for salmonids. Among all the bycaught animals, most (40.0%) perished in salmon semi-drift nets. A considerable number of the harbour porpoises perished inbottom set nets for cod (33.3%) while only a single bycatch event was reported from herring trawl nets. To assess the danger from different fishing gear and to determine the areas where the threats are the highest, direct observation of the fisheries was conducted. In the course of boat inspections various types of fishing gear were identified and geographical positions of 1,069 nets were marked. The majority (92%) consisted of semi-drift nets for sea trout and salmon. Relatively lowrates of bycatch were reported from bottom set nets, which had a density over 20 times less than that of surface salmon nets in the area in the autumn months. The density and distribution of both types of nets in the surveyed area was comparable during autumn and winter, when the majority of bycaught animals in bottom set nets were reported.
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Waswala-Olewe, Brian M., James Okot Okuku, and Richard Kennedy Oginga Abila. "Fishing Gear in the Sondu-Miriu River: Level of Use, Preference and Selectivity." Hydro Nepal: Journal of Water, Energy and Environment 15 (October 22, 2014): 82–86. http://dx.doi.org/10.3126/hn.v15i0.11301.
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Artisan fishers of Osodo beach of Sondu-Miriu River (Kenya) use both traditional and modern gear to catch riverine fish species. This study, conducted between August 2006 and July 2007, revealed that fishers most predominantly used gear were the seine nets (42%) and the gill nets (28%). Other used gear include long lines (14%); fish baskets (9%) and weirs (7%). The selectivity of this fishing gear varied with the developmental stages of the fish to be caught. Non-selective gear caught both targeted and non-targeted species irrespective of size and development stages. The ranking of selective to non-selective fishing gear was the long lines, fish baskets, weirs, gill nets and beach nets at 2%, 11%, 16%, 24% and 32%, respectively. The non-selective fishing gear may have negative impacts on the riverine fish by reducing spawning biomass and lacustrine fish recruitment. These findings underscore the need for greater appreciation, research, and adaptation of appropriate fishing gear to ensure sustainable utilization of the riverine fisheries in Sondu-Miriu RiverDOI: http://dx.doi.org/10.3126/hn.v15i0.11301HYDRO Nepal JournalJournal of Water Energy and EnvironmentVolume: 15, 2014, JulyPage: 82-86
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Bozaoğlu, Adem Sezai, and Kemal Pala. "Determination of fishing efficiency and selectivity of multifilament trammel nets in pearl mullet, Alburnus tarichi (Güldenstädt, 1814), fishing in Lake Van, Turkey." International Journal of Limnology 59 (2023): 11. http://dx.doi.org/10.1051/limn/2023011.
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This study aimed to determine the selectivity of multifilament trammel nets in pearl mullet, Alburnus tarichi (Güldenstädt, 1814), and fishing in Lake Van (east of Turkey). In line with this objective, the multifilament trammel nets with 20, 22 and 24 mm mesh sizes were tested in trials. The current study was conducted between September 2019 and April 2020. Thirty-four fishing operations were conducted in the 40–60 m depth range. The “SELECT” method was applied to determine the selectivity parameters. According to the results, the lengths of the optimum catching using nets with 20, 22 and 24 mm mesh sizes were calculated as 20.76 cm, 22.07 cm and 24.11 cm, respectively. The highest average CPUE in weight was 24 mm (6.007 kg/ 100 m / day). Considering the data obtained in the present study, the best optimum catch length and CPUE values for pearl mullet fishing were determined in multifilament trammel nets with a 24 mm mesh size. In conclusion, this study suggests that using a 24 mm mesh size in a lake for pearl mullet fishing will benefit fish stocks and local fishermen.
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Qin, Rixia, Xiaohong Zhao, Wenbo Zhu, Qianqian Yang, Bo He, Guangliang Li, and Tianhong Yan. "Multiple Receptive Field Network (MRF-Net) for Autonomous Underwater Vehicle Fishing Net Detection Using Forward-Looking Sonar Images." Sensors 21, no. 6 (March 10, 2021): 1933. http://dx.doi.org/10.3390/s21061933.
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Underwater fishing nets represent a danger faced by autonomous underwater vehicles (AUVs). To avoid irreparable damage to the AUV caused by fishing nets, the AUV needs to be able to identify and locate them autonomously and avoid them in advance. Whether the AUV can avoid fishing nets successfully depends on the accuracy and efficiency of detection. In this paper, we propose an object detection multiple receptive field network (MRF-Net), which is used to recognize and locate fishing nets using forward-looking sonar (FLS) images. The proposed architecture is a center-point-based detector, which uses a novel encoder-decoder structure to extract features and predict the center points and bounding box size. In addition, to reduce the interference of reverberation and speckle noises in the FLS image, we used a series of preprocessing operations to reduce the noises. We trained and tested the network with data collected in the sea using a Gemini 720i multi-beam forward-looking sonar and compared it with state-of-the-art networks for object detection. In order to further prove that our detector can be applied to the actual detection task, we also carried out the experiment of detecting and avoiding fishing nets in real-time in the sea with the embedded single board computer (SBC) module and the NVIDIA Jetson AGX Xavier embedded system of the AUV platform in our lab. The experimental results show that in terms of computational complexity, inference time, and prediction accuracy, MRF-Net is better than state-of-the-art networks. In addition, our fishing net avoidance experiment results indicate that the detection results of MRF-Net can support the accurate operation of the later obstacle avoidance algorithm.
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Sudarmo, Agnes Puspitasari, Mirna Dwirastina, and Yoga Candra Ditya. "Types of fishing gear in Salah Nama Island, Musi River South Sumatra." BIO Web of Conferences 112 (2024): 03001. http://dx.doi.org/10.1051/bioconf/202411203001.
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The estuary of Musi River and the swamps at Salah Nama Island are fishing areas for local fishers from Banyuasin Regency, South Sumatra. The fishers are well adapted to fish habitat complexities and fish biodiversity by operating various types of fishing gear. Description of fishing gear is a type of information needed for fisheries management. This study aims to make an inventory of fishing gear operated by the local fishers and assess the conformity of the fishing gear with existing regulations. Field surveys and interviews were carried out from March to May 2023 involving fishers around the island. As expected, their catches were dominated by estuarine fishes. This study identified three categories of fishing gear, namely traps (sengkirai, traps for shrimps), gillnets (seluang nets, driftnets, tangkul, and cast nets), and hooks in the form of longlines. The specifications of all fishing gear complied with the existing regulations.
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Jones, Benjamin L., and Richard K. F. Unsworth. "The perverse fisheries consequences of mosquito net malaria prophylaxis in East Africa." Ambio 49, no. 7 (November 11, 2019): 1257–67. http://dx.doi.org/10.1007/s13280-019-01280-0.
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Abstract Malaria is a serious global health issue, with around 200 million cases per year. As such, great effort has been put into the mass distribution of bed nets as a means of prophylaxis within Africa. Distributed mosquito nets are intended to be used for malaria protection, yet increasing evidence suggests that fishing is a primary use for these nets, providing fresh concerns for already stressed coastal ecosystems. While research documents the scale of mosquito net fisheries globally, no quantitative analysis of their landings exists. The effects of these fisheries on the wider ecosystem assemblages have not previously been examined. In this study, we present the first detailed analysis of the sustainability of these fisheries by examining the diversity, age class, trophic structure and magnitude of biomass removal. Dragnet landings, one of two gear types in which mosquito nets can be utilised, were recorded across ten sites in northern Mozambique where the use of Mosquito nets for fishing is common. Our results indicate a substantial removal of juveniles from coastal seagrass meadows, many of which are commercially important in the region or play important ecological roles. We conclude that the use of mosquito nets for fishing may contribute to food insecurity, greater poverty and the loss of ecosystem functioning.
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Vitale, Dyana, Andrea Spinelli, and Yolanda Picó. "Microplastics Detected in Sediments and Rocks Substrate of Marine Areas with Ghost Nets." Journal of Marine Science and Engineering 11, no. 4 (March 30, 2023): 750. http://dx.doi.org/10.3390/jmse11040750.
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According to UNEP and FAO reports, the fishing nets abandoned in the seas around the world represent approximately 10% of the plastic waste present in the oceans. These nets, also called ghost nets, can be degraded over time, releasing microplastics and contaminating the environment. Studying the presence and amount of microplastics in an area impacted by ghost nets in the Gulf of Cefalù, northern coast of Sicily, Italy can help to understand the level of contamination in these zones. The planned study methodology has been carried out by sampling sediment and rock substrate, on a quantitative basis, by scuba diving at seven stations selected as the most representative for the presence or absence of fishing nets in the study area. Two different extraction methods for sediment and rock samples were taken from the literature and modified for the present study. Microplastics determination was carried out according to, first, a visual identification and, second, a polymer type identification by ATR-FTIR spectroscopy, demonstrating the presence of polyamide, nylon, or polyethylene in the impacted areas, probably derived from the degradation of fishing nets. The present study reports the first record of microplastics determination in rock substrate samples recollected by scuba diving activities.
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Ghaouar, Hana, Wiem Boussellaa, and Imed Jribi. "Ghost Gears in the Gulf of Gabès: Alarming Situation and Sustainable Solution Perspectives." Sustainability 16, no. 7 (March 22, 2024): 2632. http://dx.doi.org/10.3390/su16072632.
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This study represents a first step in investigating the prevalence, causes, and spatial distribution of Abandoned, Lost, or Discarded Fishing Gears (ALDFGs) in the Gulf of Gabès, a critical fishing area in Tunisia. Five main fishing gear types—benthic trawls, encircling nets, longlines, gillnets, and trammel nets were analysed for their loss rates and contributing factors. The study involved extensive surveys among local fishermen and the use of geographic information system (GIS) tools for spatial mapping. The findings reveal varying loss rates among different gear types, with longlines experiencing the highest losses (59%), followed by trammel nets (45%), gillnets (40%), trawls (38%), and encircling nets (36%). Causes of gear loss include entanglement on obstructions, conflicts with other fishing gears, entanglement with marine animals, adverse weather conditions, and intentional dumping at sea. The study highlights the challenges posed by the consistent increase in fishing effort in the region. Spatial distribution mapping indicates two significant concentrations of ALDFGs, correlating with specific fishing activities and depths. The study emphasizes the importance of addressing gear losses as a threat to marine biodiversity and ecosystem health. Recommendations for mitigation include improving boat equipment, raising awareness among fishermen, implementing effective waste management, and exploring economic incentives for ALDFG recovery. This research contributes essential insights for fisheries management, environmental conservation, and sustainable practices in the Gulf of Gabès. Collaborative efforts are crucial for developing and implementing strategies that minimize the impact of ALDFGs on the marine environment while supporting the socio-economic interests of fishermen.
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Masmulyadi, Masmulyadi, and Sri Widodo. "ANALISIS PENDAPATAN NELAYAN BAGAN PERAHU DI KABUPATEN KEPULAUAN SELAYAR MASMULYADI." Agro Ekonomi 25, no. 2 (December 21, 2016): 150. http://dx.doi.org/10.22146/agroekonomi.17193.
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This study aim to know level of income and business profit of lift nets boat and the factors that affect the income of fisherman’s boat lift nets in Selayar District. The hypothesis is (1) fisherman’s boat lift nes is business profitable, (2) estimated operating revenues of boat lift fisherman affected by the intensity factor to sea fishing intensity, family dependent age, education, business experience, hauling and capital.This research uses descriptive analytical method. The sample used in this study is the fisherman who use fishing gear fisherman’s light fishing boat of 30 who simple random. The analysis used is farm management analysis and regression analysis.The result showed that the fishing affect by fishermen’s using the boat in one period light fishing arrest financially beneficial to the averagevincome of Rp 9.817.139 and the value of the RC ratio was 1,32. While the factors influencing income is the intensity of fishing bots at sea fishing intensity, family dependent, age, education, business experience, hauling and capital.
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Azrianto, Frengky, Nevrita Nevrita, and Dony Apdilah. "Diversity of Fishing Equipment for Fishermen in Gunung Kijang District, Bintan Regency." Jurnal Perikanan dan Kelautan 26, no. 2 (June 21, 2021): 94. http://dx.doi.org/10.31258/jpk.26.2.94-97.
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The increase in fishery production in Gunung Kijang District cannot be separated from fishing activities. The use of fishing gear that has the potential to damage the environment is assumed to be caused by public ignorance about the dangers of these tools. However, information about the diversity of types of fishing gear used by fishermen in Gunung Kijang District is still scarce. The purpose of the preparation of this scientific article is to provide information about the types of fishing gear used by the community in Gunung Kijang District, Bintan Regency. The preparation of this scientific article was carried out in April 2021 in Gunung Kijang District using a descriptive analysis based on a literature review using secondary data as a source of information. The fishing gear used by Gunung Kijang fishermen include mackerel nets, tuna, stingrays, corals, crabs, floating nets, motor boat charts, fish traps, crab traps, oval crab traps, fishing rods, longline fishing rods, spears, fish guns.
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Handayani and Dwi Ernaningsih. "Efek Analisis Dampak Pemberlakuan PERMEN No. 71/PERMEN-KP/2016 Terhadap Keberadaan Jaring Arad di Perairan Teluk Jakarta." Jurnal Ilmiah Satya Minabahari 3, no. 1 (August 31, 2017): 15–25. http://dx.doi.org/10.53676/jism.v3i1.39.
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The aim of this research is to know the response of fisherman of arad nets towards the enactment of Regulation of Minister of Marine and Fishery Number 71 / PERMEN-KP / 2016, to analyze social, economic, and fishery resources impacts of Fishery Minister's Regulation No. 71 / PERMEN-KP / 2016 for fisherman nets Arad. This study used census method by conducting direct interviews to respondents using arad fishery fishing equipment which is represented by 30 arad fishermen respondents in Jakarta Bay waters (population). The results of this study for respondents who do not agree with the implementation of Candidate KP No. 71 Year 2016 argued that the arad web does not damage the aquatic ecosystem of the Bay of Jakarta, does not have the expertise to operate other fishing equipment other than arad nets, the absence of capital to replace the arad fishing gear, while for the respondents who agree with the enactment of Candidate KP. 71 of 2016 argued that the arad web was damaging the waters ecosystem of the Jakarta Bay so they were willing to switch to using environmentally friendly fishing gear. Social impact for fishermen of arad nets due to the enactment of Candidate of KP. 71 Year 2016 is the potential of social friction with other fishing gear. Impact is economy, fisherman's income arad net that will decrease drastically. The impact of the enactment of Candidate KP No. 71 Year 2016 to the fish resources there is a decrease in catches landed by fishermen nets arad so that fish resources can renew themselves, in addition to the aquatic ecosystem can improve themselves in order to create a well maintained ecosystem of fisheries.
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Meilia Atikasari, Asri Sawiji, and Toha Muslih. "Environmental friendliness of fishing gears in Kranji, Lamongan Regency." Journal of Marine Resources and Coastal Management 3, no. 1 (February 23, 2022): 13–20. http://dx.doi.org/10.29080/mrcm.v3i01.1160.
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Increasing time has made technological advances increase, including in the field of fisheries which has a positive impact on fishing business in Indonesia. Environmentally friendly fishing technology is a fishing gear that does not have a negative impact on the environment. The use of environmentally friendly fishing gear is very important to be applied in the fishing process in certain waters. This study was conducted in Kranji Village, Paciran District, Lamongan Regency. The purpose of this study is to analyse the level of friendliness of fishing gear in Kranji Village, besides the specifications, operating methods, and variety of catches. The research method used survey and in-depth interviews with related parties related to the results of research and the level of friendliness of fishing gear. The weighting determination of the level of environmental friendliness of fishing gear is based on the Food and Agriculture Organization (FAO). The results of this study shows that the purse seine fishing gear, cob nets, gill nets and payang are environmentally friendly fishing gears, while mini trawlers are non-environmentally friendly fishing gear. This indicates that the presence of trawling gear can affect the decline in fishery resources in Kranji, Lamongan Regency.
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D. PhD, Oruonye, E., Emmanuel, J., Ahmed, Y. M., PhD, and Musa, D. G. "Artisanal Inland Water Fishing and Challenges of Livelihood Sustainability in Ibi Local Government Area, Taraba State Nigeria." Social Science, Humanities and Sustainability Research 4, no. 5 (September 11, 2023): p18. http://dx.doi.org/10.22158/sshsr.v4n5p18.
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This study examined challenges of livelihood sustainability from artisanal inland water fishing activities in Ibi LGA, Taraba State, Nigeria. Descriptive survey design was adopted. Purposive sampling was used in selecting 406 respondents from 12 communities in 6 political wards of the LGA. Descriptive statistics was used to analyse 401 questionnaires retrieved. Findings of the study reveal decline in daily fish catch from three baskets 10 years ago to only one basket presently. Also, income from fishing has declined from ₦150,000 ($192) monthly 10 years ago to less than ₦50,000 ($64) presently. Factors responsible for decline in fish catch include rising water level, temperature increase, pollution, climate change, seasonality and unsustainable fishing practices. The unsustainable fishing practices include use of chemicals, small size nets and mosquito nets in fishing. The results reveal that fishermen engaged in non-fishing activities, fish farming and construction of fishing ponds along the floodplain as a way of achieving livelihood sustainability. Challenges of livelihood sustainability include seasonality of fishing activities, decline in fish stocks, use of traditional fishing methods and unsustainable fishing practices among others. The study recommend the need to enforce extant laws on fishery protection, enlightenment campaign, and government support to fishing cooperatives.
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Lauriano, G., and S. Bruno. "A note on the acoustic assessment of bottlenose dolphin behaviour around fishing gears in the Asinara Island National Park, Italy." J. Cetacean Res. Manage. 9, no. 2 (February 22, 2023): 137–41. http://dx.doi.org/10.47536/jcrm.v9i2.681.
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Common bottlenose dolphins co-exist with artisanal fisheries in the Asinara Island National Park area (northwestern Sardinia, Italy) and are blamed for damage to some fisheries. To investigate this, two T-POD echolocation loggers were used between July 2003 and October 2004 to monitor the occurrence and behaviour of dolphins in the proximity of three different fishing gear types. With the support of local fishermen, the T-PODs were opportunistically deployed on trammel nets set for striped red mullet or for lobster and on bottom traps set to catch benthic fish species. Inter-click Intervals (ICI) and the Pulse Repetition Frequency (PRF) have been adopted as indicators of dolphins echolocation behaviour in the proximity of fishing gears (Leeney and Tregenza, 2006). PRF values were found to be consistently higher in proximity to trammel nets for striped red mullets compared to the other gears. Moreover, ICI values in the proximity of red mullet trammel nets were found to be statistically lower than those recorded both around trammel nets for lobster (p<0.01) and around traps (p<0.01). These findings suggest that feeding related activities by dolphins could be absent or take place at very low levels in the proximity of traps and, to a lesser extent, in the proximity of trammel nets set for lobster, but may occur more regularly around nets for striped red mullet. The results show that static acoustic monitoring can detect significant differences in dolphin echolocation behaviour around different fishing gears. The findings seem to be consistent with previous evidence of interactions between bottlenose dolphins and fishing gear types in the area.
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Rocklin, Delphine, Marie-Catherine Santoni, Jean-Michel Culioli, Jean-Antoine Tomasini, Dominique Pelletier, and David Mouillot. "Changes in the catch composition of artisanal fisheries attributable to dolphin depredation in a Mediterranean marine reserve." ICES Journal of Marine Science 66, no. 4 (March 11, 2009): 699–707. http://dx.doi.org/10.1093/icesjms/fsp036.
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AbstractRocklin, D., Santoni, M-C., Culioli, J-M., Tomasini, J-A., Pelletier, D., and Mouillot, D. 2009. Changes in the catch composition of artisanal fisheries attributable to dolphin depredation in a Mediterranean marine reserve. – ICES Journal of Marine Science, 66: 699–707. There is increasing evidence from previous studies, and from fishers’ observations, that coastal dolphins use fishing nets as an easily accessible feeding source, damaging or depredating fish caught in the nets. This study investigates the impact of dolphin depredation on artisanal trammelnets by analysing the catch composition of 614 artisanal fishing operations in the Bonifacio Strait Natural Reserve (France). Common bottlenose dolphins (Tursiops truncatus) attacked, on average, 12.4% of the nets and damaged 8.3% of the catch. However, attacked nets were characterized by statistically significantly higher catch per unit effort than unattacked ones. Catch composition also differed significantly after dolphin attacks; bentho-pelagic fish were more represented and reef-associated fish less represented. Our results suggest that (i) dolphins are attracted by high fish densities in the fishing area and/or nets, and (ii) their attacks induce specific fish-avoidance behaviour, according to the fish position in the water column. Although dolphins depredate a small part of the catch, damage to nets, not yet assessed in this area, could weaken the benefits that reserves can provide to artisanal fisheries.
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S., Tikhonov. "FISHING IN THE LATE BRONZE AGE (BASED ON THE MATERIALS OF SITES NEAR THE V. ELOVKA, TOMSK REGION)." Teoriya i praktika arkheologicheskikh issledovaniy 35, no. 1 (2023): 148–59. http://dx.doi.org/10.14258/tpai(2023)35(1).-09.
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The article considers materials on the fishing of the population of the Late Bronze Age, who left a complex of sites near the village of Elovka, Tomsk Region. In the excavations of V.I. Matyushchenko 1960–1961 and 1982, fishing tools and ichthyological materials were found. Their analysis allows us to conclude that the ancient population used various methods of catching fish: with hooks, nets, possibly harpoons, and fixed and removable traps. Clay and stone sinkers for nets are most widely represented. The presence of a sinker with a through hole suggests the use of bottom nets. Fishing grounds were reservoirs near the settlement: sands along the banks of the Siman duct, possibly the mouths of its small left tributaries. Ancient fishermen mainly hunted ide, nelma, and pike. Sturgeon, muksun were not the main object of fishing. The roach was not an object of catching, and was, most likely, a by-catch. The fish was harvested, since there are about a lot of places of accumulation of ichthyological materials, and one pit.
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Kostrykin, Dmitriy Alekseevich, and Yulia Nikolaevna Grozesku. "ESTIMATING EFFICIENCY OF POND ELECTRIC SEINE NETS OPERATION." Vestnik of Astrakhan State Technical University. Series: Fishing industry 2021, no. 3 (September 30, 2021): 127–33. http://dx.doi.org/10.24143/2073-5529-2021-3-127-133.
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The article considers the problem of low productivity of many fish farms, especially non-drainage ponds against the background of a growing increase in the volume of fish farming, which is typical for pond fish farming in Russia. It has been found that one of the main factors of low productivity (1–5 c/ha) is the imperfection of existing tools and methods of fishing. With significant costs of manual labor and time, the catch of farmed fish is no more than 50%. The remaining fish die mostly during winter fish kills. To reduce the proportion of manual labor and improve the efficiency of fishing in non-drainage ponds, many countries are looking for the methods to modernize existing or develop new fishing gear. The most promising in this respect are electric breeders for fishing in the non-drainage ponds, small lakes and water reservoirs. The advantages of this method are the coverage of a large fishing zone, the possibility of catching fish leaving ordi-nary seines, and work in silted and tied water bodies. Studying the regularities of the electric field impact on fish is necessary to explain and predict its behavior in electric fields, to develop technical means that provide the necessary control activity, to develop measures to protect ichthyofauna from the harmful effects of electric fields, etc.
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Borah, Gayotree Agni, Somim Nasreen, and Prasanna Kumar Dutta. "A Study on Ichthyofaunal Diversity and Fishing Gears Used in the Wetlands Areas Nearby Nimati Ghat, Jorhat, Assam." Biosciences Biotechnology Research Asia 20, no. 3 (October 5, 2023): 1015–21. http://dx.doi.org/10.13005/bbra/3152.
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The North East of India is rich in biodiversity. There are various species of fish found in the rivers, lakes and ponds of the region. Different ethnic groups from this region use different types of techniques to catch these fish. To study different aspects of fish, the study of fishing gears is prerequisite. People of Assam use different types of indigenous fishing gears to catch fish. Most of these fishing gears are made of bamboo. In the current study, attempts were made to analyse the ichthyofaunal biodiversity along with indigenous tools used to catch fish in the wetlands areas nearby Nimati Ghat in Jorhat. A study was conducted to record the traditional fishing techniques used in these places, and it had been discovered that there were ten various kinds of traps, nets, and hooks used for fishing. Many synthetic nets replace the traditional fishing gears. During the study, different kinds of fish were recorded from the study areas.
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Seslavinsky, Vyacheslav I. "Hydrodynamically effective area for traps and nets." Izvestiya TINRO 183, no. 4 (December 30, 2015): 278–83. http://dx.doi.org/10.26428/1606-9919-2015-183-278-283.
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Method for estimation of hydrodynamically effective area for fishing traps and nets is presented. Fish can detect hydrodynamic excessive pressure and water flow turbulence on the distance that depends on its lateral line sensitivity and swiftness of perception, but also on the flow velocity, drag resistance of fishing gear, fit coefficients for its covering, and type of the covering. The latter dependencies are considered. Algorithm for calculation of the effective area for flat netting gears is derived.
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Balagizi, Akonkwa, Ahouansou Montcho Simon, Nshombo Muderhwa, and Lalèyè Philippe. "Caractérisation De La Pêche Au Lac Kivu." European Scientific Journal, ESJ 13, no. 21 (July 31, 2017): 269. http://dx.doi.org/10.19044/esj.2017.v13n21p269.
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This study was focused on the description of fishing gears on Lake Kivu. Data were collected from March 2012 to February 2014 in Goma, Bukavu, and Kibuye fishing stations. The study findings indicate that gill nets, beach seine, lift net, trammel net composed of two panels of small and larger meshes (mosquito net attached to lift net parts), mosquito net, longline, single line, pots, and cast net were identified as fishing gears used on Lake Kivu. Longline was more selective (2 species) in terms of species selection. The lift net presented the best catch (19.4 ± 11 kg), while the trammel net showed the highest CPUE (7.9 ± 6.1 kg/h). The large dimensions of gears and the long netting duration characterized gillnets (1023.2 ± 620.1 m2 ) and longline (10.3 ± 4.6 hours) respectively. Cast-nets (20mm) showed the largest mesh size, while mosquito nets (1 ± 0.3 mm) were the smallest.
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Situngkir, Mariono, Alit Hindri Yani, and Jonny Zain. "Productivity of fourfinger threadfin (Eleutheronema tertadactylum) capture fishery in Bungur Village Rangsang Pesisir Sub-District Meranti Islands District, Riau Province." South East Asian Marine Sciences Journal 1, no. 1 (October 3, 2023): 22–28. http://dx.doi.org/10.61761/seamas.1.1.22-28.
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This study aimed to determine the productivity value of turtle catching in Bungur Village, Rangsang Pesisir District, Meranti District, Riau Province. The production of kurau nets for five years shows that fourfinger threadfin fishing effort and production fluctuate yearly. In the period from 2017-2021, 2018 was the year with the most production of kurau nets, with a total catch of kurau nets totaling 7205 kg/year, and the highest catch occurred in March, namely 867.7 kg while the lowest catch occurred in July, namely 166.6 kg. Based on the results of the calculation of the fishing season index, it is known that the fish catch is abundant from January to March. In these months, fishing is excellent, and the peak season is in February. From April to September, the fish catch is minimal, and this month is the wrong time to catch fish.
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Hasmawati, Hasmawati, Adam Adam, Muhammad Aras, and Salman Salman. "Composition of types fishing gear in Barru regency waters in the pandemic time of Covid-19." Akuatikisle: Jurnal Akuakultur, Pesisir dan Pulau-Pulau Kecil 5, no. 1 (May 29, 2021): 21–25. http://dx.doi.org/10.29239/j.akuatikisle.5.1.21-24.
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The potential of marine fish resources in Districts Barru is multi-species, especially pelagic fish. Therefore, in the management and utilization of fishery resources it is very possible for the community to be able to operate various fishing gear. This study aims to determine the composition of the types of fishing gear operated by fishermen in Barru Districts waters of during the pandemic Covid 19. Data collection was carried out from September to October 2020 in around the waters and coastal areas in Barru Districts. This study used a descriptive survey method, by collecting available data (secondary data) in the form of: categories of types and numbers of fishing gears. besides that, field observations will also be carried out. During the pandemic Covid-19, the operation of fishing gear in Barru Districts waters was 13 types of fishing gear, with a composition consisting of four types of fishing gears that were predominantly used, namely 622 drifting gill nets (28.4%), hand lines (21, 7%), Bottom gill nets (19.9%), trolling line (9.6%). Meanwhile, the least used fishing gear was 8 Bagan Tancap (lift net) (0.4%).
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Srivastava, PK, and SJ Srivastava. "Indigenous fishing gears in Suraha Lake, Ballia, Uttar Pradesh, India." Journal of Wetlands Ecology 5 (December 28, 2011): 73–78. http://dx.doi.org/10.3126/jowe.v5i0.5156.
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The study aimed at assessing the indigenous fishing methods adopted by the fishermen in Suraha Lake. Survey was conducted during August 2002 - July 2004. Information was collected through participatory rapid appraisal covering the entire lake and four fishermen villages viz Mairitar, Surajpura, Kaithauli and Basantpur. Study indicated that various types of local indigenous traditional fishing gears are used by fishers for commercial exploitation of the lake. Plank-built boats (Dingi) were used in the fishing. These boats are small and light and prepared locally by fishers. Gill net and cast net were the main gears and contributed more then 80% of the total fish catch of the lake. Indigenous fishing gears comprising gill nets, cast nets, traps, etc., have been discussed showing their modus operandi. Key words: Indigenous fishing methods; suraha lake DOI: http://dx.doi.org/10.3126/jowe.v5i0.5156 J Wet Eco 2011 (5): 73-78
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Mandal, Basudev. "A Study on the Selectivity of Different Fishing Gear." Indian Journal of Pure & Applied Biosciences 12, no. 2 (April 30, 2024): 8–19. http://dx.doi.org/10.18782/2582-2845.9072.
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The selectivity of fishing gears plays a pivotal role in shaping the dynamics of aquatic ecosystems and fisheries sustainability. Through a comprehensive examination of trawl nets, gill nets, and longlines, this paper delves into the factors influencing selectivity, including gear design, selectivity criteria, selectivity terminologies, selection curves, and impacts. Drawing upon scientific research, empirical evidence, and case studies from around the world, this paper highlights the effectiveness of different selectivity measures in balancing the extraction of target species with the conservation of non-target species and habitat integrity. By synthesizing current knowledge and emerging trends in fishing gear selectivity, this review paper offers valuable insights for policymakers, fishers, scientists, and conservationists striving to navigate the complex interplay between human exploitation and ecological resilience in aquatic environments.
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Azkia, Lana Izzul, Muhammad Reza, and Septi Malidda Eka Putri. "PROPORTION OF LEGALLY SIZE BLUE SWIMMING CRABS CAUGHT BY FISHERMEN IN BETAHWALANG VILLAGE." Journal of Aquatropica Asia 7, no. 2 (November 7, 2022): 69–77. http://dx.doi.org/10.33019/joaa.v7i2.3421.
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Blue swimming crab is a fishery product with high economic value in Indonesia. Betahwalang Village, Demak, is one of the crab fisheries locations in the province of Central Java. High selling prices and processing industry demand encourages fishing activities. One issue brought on by increased fishing activity is the smaller crab size. It will impact the crab fishing industry in Betahwalang. The majority of the fisherman in Betahwalang Village catch crabs using arad nets, simple gill nets, and traps. This study aims to evaluate the size of crab catch results on fishing gear used by fishermen and recommend proper fishing gear for catching crabs. This research was conducted in April 2019. The catch size of crab was the primary data collected for this study, also with data on fishing grounds, methods, and characteristics of fishing gear. Data were collected by observation, interviews, and measurements of fishing gear and the carapace width of the crab. The results of data collection and processing were analyzed descriptively. The results showed that the highest proportion of legal size crabs (carapace width ≥10 cm) was caught in traps, while the proportion of unlegal size crabs caught was mostly in bottom gillnets and mini trawl.
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Rijkure, Astrida, and Janis Megnis. "TECHNICAL METHODS OF CLEANING SHIPWRECKS FROM GHOST NETS." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 22, 2024): 253–56. http://dx.doi.org/10.17770/etr2024vol3.8160.
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Ghost nets are fishing gear lost and left in bodies of water that continue to be fished. Most of the fishing gear that is lost is made of synthetic materials that break down very slowly or not at all in nature and continue to work long after the net is lost. A ghost net drifts in the sea until it catches on an object, most often a shipwreck. This harms both nature and people's economic interests. Currently, the release of shipwrecks and other sunken objects from fragments of lost nets is mainly done by human hands, resp. divers dive to the wreck and use hand tools to free the wreck from fragments of fishing gear. There are innovative robotic systems in the world that can partially replace the work of divers.
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Chaves, Paulo de Tarso, and Beatriz Ern da Silveira. "Artisanal fishing net float loss and a proposal for a float design solution." Brazilian Journal of Oceanography 64, no. 1 (March 2016): 89–94. http://dx.doi.org/10.1590/s1679-87592016114306401.
Full textAbstract:
Abstract Plastic floats from fishing nets are commonly found washed up on beaches in southern Brazil. They are usually broken and show signs of having been repaired. Characteristics of floats and interviews with fishermen suggest two main causes of float loss. First, collisions between active gear, bottom trawl nets for shrimp, and passive gear, drift nets for fish, destroy nets and release fragments of them, including floats. Second, the difficulty with which floats are inserted on the float rope of the nets when they are used near the surface. Floats are inserted to replace damaged or lost floats, or they may be removed if it is desired that the nets be used in deeper waters. Floats may thus be poorly fixed to the cables and lost. Here a new float design that offers greater safety in use and for the replacement of floats is described and tested.