Relevant bibliographies by topics / Fish aggregation

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Fish aggregation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Fish aggregation"

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Hosn, Wafa Aboul, and John A. Downing. "Influence of Cover on the Spatial Distribution of Littoral-zone Fishes." Canadian Journal of Fisheries and Aquatic Sciences 51, no. 8 (August 1, 1994): 1832–38. http://dx.doi.org/10.1139/f94-185.

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Littoral-zone fish are thought to reduce predation pressure by seeking refuge within macrophyte beds or near the lake bottom, or by aggregating. We used underwater video to measure the spatial aggregation of prey fishes in the littoral habitat. At low density, fish were more aggregated off the bottom in open habitats than when found off the bottom within macrophyte beds. At high densities, fish were primarily observed near the lake bottom, and the presence or absence of macrophyte beds had little influence on spatial behavior. No difference could be detected in the degree of aggregation seen in fish on the lake bottom inside or outside macrophyte beds. Our results lend field support to theoretical and laboratory research that suggests aggregative behavior in littoral-zone fish is strongly influenced by fish density and by habitat structure.
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Archer, Stephanie K., Scott A. Heppell, Brice X. Semmens, Christy V. Pattengill-Semmens, Phillippe G. Bush, Croy M. Mccoy, and Bradley C. Johnson. "Patterns of color phase indicate spawn timing at a Nassau grouper Epinephelus striatus spawning aggregation." Current Zoology 58, no. 1 (February 1, 2012): 73–83. http://dx.doi.org/10.1093/czoolo/58.1.73.

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Abstract Nassau grouper Epinephelus striatus are a large bodied, top level predator that is ecologically important throughout the Caribbean. Although typically solitary, Nassau grouper form large annual spawning aggregations at predictable times in specific locations. In 2003, The Cayman Islands Marine Conservation Board established protection for a newly rediscovered Nassau grouper spawning aggregation on Little Cayman, British West Indies. The large size of this aggregation provides a unique opportunity to study the behavior of Nassau grouper on a relatively intact spawning aggregation. During non-spawning periods Nassau grouper display a reddish-brown-and-white barred coloration. However, while aggregating they exhibit three additional color phases: “bicolor”, “dark”, and “white belly”. We video sampled the population on multiple days leading up to spawning across five spawning years. Divers focused a laser caliper equipped video camera on individual fish at the aggregation. We later analyzed the video to determine the length of the fish and record the color phase. Our observations show that the relative proportion of fish in the bicolor color phase increases significantly on the day leading up to the primary night of spawning. The increase in the proportion of the bicolor color phase from 0.05 early in the aggregation to 0.40 on the day of spawning suggests that this color phase conveys that a fish is behaviorally and physiologically prepared to spawn. Additionally, 82.7% of fish exhibiting dark or white belly coloration early in the aggregation period suggests that these color phases are not only shown by female fish as was previously posited.
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Ibrahim, Sakri, Julaihi Matusin, and Sukree Hajisamae. "Natural and Combination Fish Aggregating Devices (FADS) as Tools for Fish Aggregation in Lake Kenyir, Trengganu, Malaysia." ASEAN Journal on Science and Technology for Development 17, no. 2 (November 1, 2000): 39. http://dx.doi.org/10.29037/ajstd.114.

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Castro, J. J., J. A. Santiago, and V. Hernández-García. "Fish associated with fish aggregation devices off the Canary Islands (Central-East Atlantic)." Scientia Marina 63, no. 3-4 (December 30, 1999): 191–98. http://dx.doi.org/10.3989/scimar.1999.63n3-4191.

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Amarante, Cristina Fernandes do, Wagner de Souza Tassinari, José Luis Luque, and Maria Julia Salim Pereira. "Factors associated with parasite aggregation levels in fishes from Brazil." Revista Brasileira de Parasitologia Veterinária 24, no. 2 (June 12, 2015): 174–82. http://dx.doi.org/10.1590/s1984-29612015031.

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The degree of parasite aggregation is determined by a number of factors that are not well understood. In total, 3,746 fish from 73 species and their parasites were analyzed to determine associations between the degree of aggregation by taxon and specific characteristics of the fish. A multiple linear regression (95% confidence interval - CI) was used to show that in most taxa, the degree of parasite aggregation was significantly higher in freshwater fish and schooling fish but varied according to taxon in relation to gender, habitat and feeding habits. Parasite aggregations were also significantly increased in fish with a large number of parasitic larvae and greater body length in all evaluated taxa. Because the coefficients of determination of the models were lower than 60% for all taxa, other factors may be involved in parasite aggregation. Conversely, marked significance was observed for the tested variables in relation to taxon dependence, which indicates that additional studies should be performed for these factors using comprehensive databases with larger samples per parasite species.
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Hordyk, Adrian R., Neil R. Loneragan, Geoff Diver, and Jeremy D. Prince. "A cost-effective alternative for assessing the size of deep-water fish aggregations." Marine and Freshwater Research 62, no. 5 (2011): 480. http://dx.doi.org/10.1071/mf10260.

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Acoustic methodologies are important tools for monitoring deep-water fish and have the potential to provide high-precision estimates of aggregation size. However, they can be costly to design and implement for monitoring fish. Data from 2 years of scientific surveys of the spawning aggregations of orange roughy (Hoplostethus atlanticus, Collett, 1889) on the Cascade Plateau, Tasmania, collected using commercial fishing vessels and echosounders, were used to develop a cost-effective approach for estimating the size of deep-water aggregations. Criteria were developed to standardise the identification of orange roughy echo-traces from acoustic data from 23 surveys in 2001 and 19 in 2005. The spawning condition of the fish was monitored simultaneously with the acoustics in each year (n = 29 trawls each year). The volumes of the aggregations were estimated throughout the survey period. Although the precision of the estimated aggregation size is low, large amounts of data can be collected over extended periods by using this approach and the equipment on standard commercial fishing echosounders. Aggregation volumes varied markedly during each spawning season and changes in volume appear to be linked to the spawning biology. Monitoring the spawning biology, therefore, provides crucial complementary information for interpreting estimates of aggregation size from acoustic surveys.
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Johannes, Mark R. S. "Prey Aggregation Is Correlated with Increased Predation Pressure in Lake Fish Communities." Canadian Journal of Fisheries and Aquatic Sciences 50, no. 1 (January 1, 1993): 66–73. http://dx.doi.org/10.1139/f93-008.

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Aggregations of prey fish, golden shiner (Notemigonus crysoleucas), were examined during 7 yr of predator manipulations in two lakes to determine whether they responded to changes in predation pressure and varied with time-of-day, age, and habitat. Regression analysis was used to examine aggregation in 12 replicate prey densities from two time periods, two ages, two habitats, three sample series, and seven predator densities. Aggregation was assessed as the variance of mean densities for each treatment combination. Multiple regression and ANCOVA analyses indicated that (1) golden shiner aggregated more during day than night, (2) their aggregation was positively related to predator density, (3) young shiner aggregated more than older ones at low predator densities, and (4) aggregation in older shiner was more responsive to increased predator densities than aggregation in younger shiner. These results provide empirical evidence that golden shiner aggregation patterns respond to predation pressure and the response varies with time and age. These results also suggest that variance in net catches can provide an index of fish aggregation and that aggregation observed at the population level is not solely dependent on species and density, but is a behavioural response mediated by several factors including predators.
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Mangubhai, Sangeeta, Muhammad Saleh, Suprayitno, Andreas Muljadi, Purwanto, Kevin L. Rhodes, and Katherina Tjandra. "Do Not Stop: The Importance of Seamless Monitoring and Enforcement in an Indonesian Marine Protected Area." Journal of Marine Biology 2011 (2011): 1–11. http://dx.doi.org/10.1155/2011/501465.

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The harvesting of groupers (Serranidae) in Indonesia for the live reef food fish trade (LRFFT) has been ongoing since the late 1980s. Eight sites in Komodo National Park that included two fish spawning aggregation (FSA) sites were monitored for groupers and humphead wrasse,Cheilinus undulatus, from 1998 to 2003 and from 2005 to 2008 to examine temporal changes in abundance and assess the effectiveness of conservation and management efforts. Monitoring identified FSA sites for squaretail coralgrouper,Plectropomus areolatus, and brown-marbled grouper,Epinephelus fuscoguttatus. Both species formed aggregations before and during full moon from September to December, prior to lapses in monitoring (2003–2005) and in enforcement (2004-2005). Following these lapses, data reveal substantial declines inP. areolatusabundance and the apparent extirpation of one aggregation at one site. Other non-aggregating species targeted by the LRFFT showed similar declines at three of eight monitored sites. This paper highlights the impact of FSA fishing and the need for a seamless monitoring and enforcement protocol in areas where aggregation fishing pressure is high. Within Komodo National Park, local fishers, particularly those operating on behalf of the LRFFT, pose a serious threat to population persistence of species targeted by this trade.
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Smith, Barry D., Mark W. Saunders, and Gordon A. McFarlane. "Use of a Binomial–Normal Functional Model to Demonstrate that the Sex and Age Composition of Pacific Hake (Merluccius productus) Aggregations Affects Estimates of Mean Lengths-at-Age." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 8 (August 1, 1992): 1657–69. http://dx.doi.org/10.1139/f92-185.

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We present statistical evidence that estimates of mean length-at-age from a single aggregation of Pacific hake (Merluccius productus) are unlikely to represent those for the entire local population because fish length varies with age and sex, and fish aggregations are probably structured by fish size. We present series of simple linear relationships between estimates of mean length-at-age from hake sample sets and both the proportion of males and the proportions-at-age in those sample sets. To determine these relationships, we developed a likelihood-based model which incorporated model and sampling uncertainty in estimates of mean lengths-at-age, and sampling uncertainty in the estimated proportions of males or proportions-at-age. The results show that if fish length varies with sex or age, then the mean lengths-at-age estimated from a single sample set will be predictably, although perhaps modestly, influenced by the age and sex composition of the sample set. Thus, estimates of population mean lengths-at-age, and other sex–age–size statistics of fish that form aggregations, should be based on the premise that an aggregation of fish, not an individual fish, is the basic sampling unit.
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NAKASHIMA, TOSHIKO, and TATSURO MATSUOKA. "Ghost-fishing mortality and fish aggregation by lost bottom-gillnet tangled around fish aggregation device." NIPPON SUISAN GAKKAISHI 71, no. 2 (2005): 178–87. http://dx.doi.org/10.2331/suisan.71.178.

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Dissertations / Theses on the topic "Fish aggregation"

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Bijoux, Jude peter. "Reef fish spawning aggregation sites : the ecology of aggregating and resident species." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4013.

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Les sites d'agrégation de ponte (AP) sont des zones où des poissons d'une même espèce se rassemblent pour frayer. En dépit de leur importance dans la reproduction de nombreuses espèces de poissons des récifs coralliens, bien peu de sites d'AP sont gérés. Le but de cette étude est d'améliorer la compréhension générale sur l'écologie des sites d'AP en vue de faciliter la gestion. L'étude, réalisée aux Seychelles, se concentre sur les individus regroupant sur les sites d'AP pour frayer et aussi sur ceux résidant sur ces sites. La télémétrie acoustique et le recensement visuel sous-marin ont, ici, été employé comme principaux outils d'observation des espèces formant des agrégations de reproduction (cordonnier (Siganus sutor), mérou camouflage (Epinephelus polyphekadion) et mérou marbré (E. fuscoguttatus)) et des espèces résidant sur les sites d'AP. Les détections acoustiques ont montré que les individus de S. sutor présentent une grande fidélité à leur site de ponte et une périodicité liée à la période de pleine lune. Par ailleurs, les agrégations de ponte d'E. fuscoguttatus et E. polyphekadion se chevauchent spatialement et temporellement avec une forte périodicité liée à la nouvelle lune. La formation d'AP de E. fuscoguttatus et E. polyphekadion provoque des changements complexes dans l'assemblage de poissons résidents sur le site. L'effet de la phase lunaire sur les assemblages de poissons résidant sur les sites d'AP de S. Sutor apparait être dépendant de l'échelle considérée. Les informations sur la dynamique spatiale et temporelle des espèces étudiée sont utilisées pour proposer des mesures de gestion susceptibles d'améliorer la protection des sites d'AP
Fish spawning aggregation (FSA) sites are areas where repeated concentration of conspecific fish gathers for the purpose of spawning. Despite of their importance in the reproduction of many coral reef fishes, few FSA sites are actively managed. The aim of this study, conducted in the Seychelles, was to improve general understanding on the ecology of FSA sites to facilitate their management. It focuses on both the individuals that aggregate at FSA sites to spawn and those that are resident at FSA sites. Acoustic telemetry and underwater visual census were used to study three species that form spawning aggregations (spinefoot shoemaker (Siganus sutor), Camouflage grouper (Epinephelus polyphekadion) and Brown-marbled grouper (E. fuscoguttatus)) and the resident fish assemblages at FSA sites. Acoustic detections found individual S. sutor to have high fidelity to individual FSA sites and to show significant periodicity with the full moon period in the timing of their arrival and departure from FSA sites. Conversely, spawning aggregations of E. fuscoguttatus and E. polyphekadion overlapped spatially and temporally, with strong periodicity for spawning aggregation to form with the new moon period. The formation of E. fuscoguttatus and E. polyphekadion FSAs caused complex changes in the fish assemblage that is resident at the FSA site. The effect of lunar phase on the resident fish assemblages at S. sutor FSA sites appeared to be scale-dependent, having greater impact at the larger than the smaller FSA site. Information on the spatial and temporal dynamics of aggregating and resident fish species is used to propose management actions to improve the protection of FSA sites
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Markovsky, W. Coult. "The role of the Cape Fear River discharge plume in fisheries production : aggregation and trophic enhancement /." Electronic version (Microsoft Word), 2004. http://dl.uncw.edu/etd/2004/markovskyw/wcoultmarkovsky.doc.

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DeWitte-Orr, Stephanie. "A study of innate antiviral mechanisms using fish cell lines." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/1272.

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Understanding basic antiviral mechanisms in vertebrates is essential for developing methods to enhance antiviral responses and promote human and animal health. In fish these antiviral mechanisms are poorly understood, but are important to understand because of the devastating impact of viral diseases on aquaculture. Therefore, the antiviral responses of a rainbow trout macrophage-like cell line, RTS11, and two non-immune cell lines, the rainbow trout fibroblast RTG-2 and Chinook salmon embryo CHSE-214 were studied. Three antiviral responses were first characterized using the viral mimic, synthetic double-stranded RNA (poly IC), and then their induction was investigated using Chum salmon reovirus (CSV). The responses were: 1) apoptosis, which is programmed cell death and a primitive antiviral defense; 2) homotypic aggregation (HA), which is clustering of like immune cells; and 3) expression of Mxs, which are antiviral proteins belonging to GTPase super-family. Some of these antiviral mechanisms were investigated using a novel continuous cell line, PBLE, developed from a peripheral blood leukocyte preparation of the American eel, Anguilla rostrata.

RTS11 was exceptionally susceptible to apoptosis. The cells died at lower concentrations of poly IC and other agents, including the translation inhibitor, cycloheximide (CHX), and fungal metabolite, gliotoxin. Death was predominantly by apoptosis, as judged by DNA ladders, nuclear fragmentation, and protection by caspase inhibitors. By contrast, the other two cell lines died most commonly by necrosis, when death did occur. Co-treating RTS11 with CHX greatly sensitized the cells to poly IC. Based on the protection afforded by inhibitors of dsRNA-dependent protein kinase (PKR), RTS11 apoptosis induced by poly IC with CHX co-treatment but not gliotoxin was mediated by PKR. As macrophages are likely among the first cells to contact viruses during an infection in vivo and are mobile, the sensitivity of RTS11 to dsRNA killing could reflect a protective mechanism by which virus spread is limited by the early death of these first responders.

HA of RTS11 was induced by poly IC. HA required divalent cations and was blocked by CHX and by PKR inhibitors. This suggested that HA induction was PKR-mediated and involved the synthesis of new cell surface molecule(s), possibly galectins. As an antiviral mechanism, HA induction by dsRNA could be interpreted as an initial protective response, allowing cell localization at the site of infection, but once translation becomes inhibited, apoptosis ensues.

Mx was induced by poly IC in RTS11 and RTG-2 as judged by RT-PCR. Western blotting revealed constitutive Mx expression more consistantly in RTS11, but induction by poly IC in both cell lines. Medium conditioned by cells previously exposed to poly IC and assumed to contain interferon also induced Mx transcripts in RTS11 but not RTG-2. In RTS11, poly IC activated PKR activity, and PKR inhibitors blocked Mx induction, which is the first demonstration of PKR mediating Mx expression.

The dsRNA virus, CSV, also induced apoptosis, HA, and Mx expression, but in some cases contrasting with poly IC experiments. CSV induced apoptosis in RTG-2 and CHSE-214 but not in RTS11, and HA induction by CSV in RTS11 was not dependent on PKR. Mx induction was sustained in RTG-2 and transitory in RTS11; however, both cell lines supported CSV replication.

The novel cell line, PBLE, was also characterized in this study. PBLE was derived from an adherent culture of peripheral blood leukocytes from the American eel, Anguilla rostrata. PBLE were found to grow over a wide range of temperatures and fetal bovine serum (FBS) concentrations. This cell line was able to undergo apoptosis in response to gliotoxin. PBLE was also susceptible to a number of viruses, including CSV; however, CSV infection did not lead to apoptosis.

This study suggests that antiviral responses are likely numerous and overlapping and depend on cell type and virus. Understanding them should lead to novel methods for protecting fish from viral diseases. More specifically, using cell lines such as PBLE may aid in the understanding of species specific and perhaps even cell type specific antiviral mechanisms.
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Cobain, Matthew Robert David. "Fish and their scales : on the power laws of aggregation, size distribution and trophic interaction." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/424756/.

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Power law relationships are ubiquitous in ecology, and complex systems in general, and can be used as metrics to describe many aspects of ecosystem structure and function. While ecological interactions and processes predominantly occur at the individual level of biological organisation, currently, most ecological studies aim to estimate “typical” ecosystem behaviour over large spatial and temporal scales. This disconnect results in the under- appreciation of ecosystem dynamics that are potentially important for developing ecological theory and ecosystem modelling. The research presented herein aims to estimate within-ecosystem dynamics, as quantified by power law relationships, to test whether expected ecological dynamics can be captured effectively at smaller scales. I show that Taylor’s power law, a metric of aggregation, varies systematically, both spatially and temporally within the North Sea fish community, with the abiotic environment when populations were considered as cohorts of individual body sizes. By combining estimates of the power law distribution of body size in fish with stable isotopes that can be used to infer trophic interactions, I show that seasonal trends in fish movement patterns and the incorporation of pulsed phytoplankton production can be quantified in a highly dynamic estuarine environment. Estimates of the in situ community predator-prey mass ratio, which describes trophic behaviour, and the apparent trophic transfer efficiency are then derived and shown to exhibit strong seasonal variation, indicative of an estuarine food web that is temporally variable. Finally, I quantify the degree of individual specialisation, a mechanism by which intraspecific competition is modulated, in the diet of a commercially important but over-exploited fish species to inform conservation efforts. This work shows that ecological dynamics can be captured by a range of ecosystem metrics and that, therefore, small scale behaviours can be tested for empirically to direct ecosystem models and theory.
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Ciftci, Nilhan. "Determination Of Potential Favorable Zones For Pelagic Fish Aggregation (anchovy) In The Black Sea Using Rs And Gis." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606160/index.pdf.

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Fishing is a significant source of food, and constitutes an important source of income in Turkey. Due to the large extent required to analyse the distribution of fish stocks, information derived from satellites play an important role in fisheries applications. Chlorophyll concentration and sea surface temperature (SST) are the most significant parameters which define the fish habitat. The accuracy of these parameters in the Black Sea taken from two different satellites, namely Sea-viewing Wide Field-of-views Sensor (SeaWIFS) and Moderate Resolution Imaging Spectroradiometer (MODIS) are evaluated. Results indicate that both satellites give good estimates of SST but the algorithms overestimate the chlorophyll concentration values. MODIS products are used in the subsequent analyses due to their high correlation with in-situ measurements relative to SeaWIFS products. The cause of the overestimation of chlorophyll concentration is further examined and a general description of environmental variability in Black Sea is done using MODIS products. Anchovy, the most important commercial fish in Turkey, has been selected as the target specie of the study. Level 3 weekly average MODIS chlorophyll and SST products are processed using remote sensing (RS) and geographic information systems (GIS) integration to estimate potential favorable zones for pelagic fish aggregations. Two different decision rules are employed to generate fish stock maps, simple additive weigthing (SAW) and fuzzy additive weigthing (FSAW). The resultant maps are used to visualize the general distribution of Anchovy in Turkish Seas from May 2000 to May 2001. The resultant thematic fish stock maps generated by FSAW analysis represents the uncertainity in the environment better than the ones generated by SAW analysis.
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au, andrew@recfishwest org, and Andrew Jay Rowland. "The biology of Samson Fish Seriola hippos with emphasis on the sportfishery in Western Australia." Murdoch University, 2009. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20091120.110541.

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This thesis had two overriding aims. The first was to describe the biology of Samson Fish Seriola hippos and therefore extend the knowledge and understanding of the genus Seriola. The second was to uses these data to develop strategies to better manage the fishery and, if appropriate, develop catch-and-release protocols for the S. hippos sportfishery. Trends exhibited by marginal increment analysis in the opaque zones of sectioned S. hippos otoliths, together with an otolith of a recaptured calcein injected fish, demonstrated that these opaque zones represent annual features. Thus, as with some other members of the genus, the number of opaque zones in sectioned otoliths of S. hippos are appropriate for determining age and growth parameters of this species. Seriola hippos displayed similar growth trajectories to other members of the genus. Early growth in S. hippos is rapid with this species reaching minimum legal length for retention (MML) of 600mm TL within the second year of life. After the first 5 years of life growth rates of each sex differ, with females growing faster and reaching a larger size at age than males. Thus, by 10, 15 and 20 years of age, the predicted fork lengths (and weights) for females were 1088 (17 kg), 1221 (24 kg) and 1311 mm (30 kg), respectively, compared with 1035 (15 kg), 1124 (19 kg) and 1167 mm (21 kg), respectively for males. Despite these differences, female and male S. hippos attained similar maximum age, i.e. 29 (1470 mm FL) and 28 years (1280 mm FL), respectively. The maximum age determined for S. hippos is greater than that recorded for any other Seriola spp. The largest female and male S. hippos recorded during this study were encountered during the tagging component and had fork lengths of 1600 mm and 1380 mm, respectively. Seriola hippos has a protracted spawning period, ca four months, which starts in late spring and continues through summer into early autumn during which time many individuals engage in large spawning aggregations on the lower west coast of Australia. The length at which 50 % of the females in the population reached maturity was 831 mm FL (888 mm TL) and approximately 4 years of age, whilst all females over 950 mm FL were mature. Whilst aggregated for spawning S. hippos ceases feeding, however, during the non-spawning period this species can best be described as an opportunistic carnivore which feeds on a variety of pelagic and demersal prey. This study has greatly increased our understanding of S. hippos movement on the west and south coasts of Australia and has documented, for the first time, the migratory behaviour of a carangid in these waters. Many S. hippos individuals undertake long distance migrations to join spawning aggregation sites near Rottnest Island. Individuals tagged at these aggregation sites where recaptured throughout this species distribution along the south coast of Australia, some after travelling distances of over 2400 km. Many S. hippos individuals displayed strong temporal and spatial spawning ground fidelity as numerous fish released at the spawning aggregations were recaptured at the exact same spawning site at similar times in subsequent years. Tagging data suggest that on the completion of spawning S. hippos individuals return to a resident location and remain in that general vicinity over the winter months. This study has developed a hypothesis describing larval dispersal associated with the S. hippos spawning behaviour exhibited near Rottnest Island. It is proposed that variations in the prevailing ocean currents, at this important spawning location throughout the protracted spawning period, leads to high intra and inter-annual variation in larval distribution and survival. The affect of this variation on the evolution of the spawning and migratory behaviour displayed by S. hippos is discussed. A recent increase in the popularity of S. hippos as a catch-and-release sportfish has led to concerns by some anglers about post release survival of this species, particularly due to the depth of capture. Short term mortality of S. hippos capture at the sportfishing sites was assessed by monitoring fish held within an enclosure near the site of capture for up to 31 hours post release. The total hooking mortality of S. hippos subjected to catch-and-release angling within the Rottnest Island sportfishery is approximately 8%. Most of this observed mortality is delayed and occurs sometime after release. Although best handling practises require ongoing development, the current level of mortality associated with this catch-and-release fishery is considered acceptable. Furthermore, this mortality is likely to have little effect on the S. hippos population due to the high abundance of this species and the fact that even the highest fishing effort yields a relatively low catch. Seriola hippos exhibits a typical teleost neuroendocrine stress response associated with catch-and-release. The physiological dysfunction associated with the stress of capture in this species does not appear to cause any post release mortality. Instead, most mortality was attributable to barotrauma, however, although mortality in S. hippos increases with capture depth, this species is much less susceptible to depth induced mortality than other commonly targeted species in which barotrauma has been observed. This study developed key handling protocols for fishers who catch-and-release S. hippos at the Rottnest Island aggregation sites. These protocols cover aspects of catch-and-release fishing such as hook type, water depth, time at surface, release method and shark predation. Almost all S. hippos observed during capture from deep water released large quantities of gas from the opercular region, particularly during the last 10 to 20 m before reaching the surface. This phenomenon has also been witnessed by divers and fishers to occur under natural conditions. Investigations into this release of gas revealed this physoclistous species to exhibit unique swim bladder characteristics. Seriola hippos possess a membranous tube that connects the posterior-dorsal surface of the swim bladder internally to a region under each operculum externally. This connection, termed the swim bladder vent, allows the escape of expanding swim bladder gases on rapid ascent. The presence of the swim bladder vent provides an explanation as to why the incidence of external barotrauma symptoms in S. hippos captured from the deepwater was low. The ability to expel excess swim bladder gases during rapid ascent whilst retaining full swim bladder function is likely to offer this semi-pelagic species considerable advantages when hunting prey, avoiding predators and engaging in spawning activities. Preliminary estimates of total mortality indicated that S. hippos is not currently subjected to a high level of fishing pressure. However, managers must remain mindful of the fact that the size at which females reach sexual maturity, i.e. 888 mm TL, is greater than the current minimum legal length, i.e. 600 mm, and thus fishers are currently allowed to harvest sexually immature fish. Furthermore, the effectiveness of future conservation measures must consider the large scale migration and spawning strategy undertaken by this species in order to ensure its protection. The collaborative research approach undertaken during this study demonstrated that a high level of community engagement produced a large amount of research interest, increased stakeholder satisfaction from project input, improved understanding of research outcomes, and increased research uptake, all of which has led to increased stewardship and conservation of the S. hippos fishery and fisheries resources in general. Indeed, projects of this nature would not be possible without this type of approach.
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Filmalter, John David. "The associative behaviour of silky sharks, Carcharhinus falciformis, with floating objects in the open ocean." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018177.

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The silky shark Carcharhinus falciformis forms the primary elasmobranch bycatch in tuna purse seine fisheries using fish aggregating devices (FADs) in all of the world’s tropical oceans. Its life-history traits of slow growth, late maturation and low fecundity make it vulnerable to over exploitation, as is apparent from historical bycatch trends. Very little is known about the associative behaviour of this species with floating objects, information which is essential in formulating effective mitigation and management measures. This study aims to address this knowledge gap through the use of various electronic tagging techniques in conjunction with dietary analysis. Dietary data were collected from 323 silky sharks incidentally caught at FADs. Approximately 40 percent of the diet consisted of prey associated with FADs while the remaining 60 percent were non-associated species of crustaceans, cephalopods and fishes. These results suggest that the associative behaviour is not primarily driven by trophic enhancement, but is likely a combination of predator avoidance, social interactions and feeding. Fine-scale behavioural data from silky sharks associated with drifting FADs were collected through the use of acoustic telemetry techniques. Acoustic tags were implanted into 38 silky sharks (69- 116 cm TL) at eight FADs. FADs were equipped with satellite linked acoustic receivers and abandoned to drift freely. Presence/absence and swimming depth data were telemetered via the Iridium satellite system. A total of 300 d of behavioural data were collected from 20 tagged individuals. Individuals remain associated with the same FAD for extended periods (min = 2.84 d, max = 30.60 d, mean = 15.69 d). Strong diel patterns were observed in both association and swimming depth. Typically individuals moved away from FADs after sunset and return later during the night, then remain closely associated until the following evening. Vertical behaviour also changed around sunset with sharks using fairly constant depths, within the upper 25 m, during the day and switching to rapid vertical movements during the night, with dives in excess of 250 m recoded. Broader scale movement behaviour was investigated using pop-up archival satellite tags (PSATs). Tags were deployed on 46 silky sharks (86-224.5 cm TL) for a total of 1495 d. Light data were used to calculate geolocation estimates and reconstruct the sharks’ trajectories. Movement patterns differed between animals and according to deployment duration. Several extensive horizontal movements were observed, with an average track length of 3240 km during an average tag deployment of 44.02 d. Horizontal movement patterns were found to correlate very closely with drift patterns of FADs. Consequently, it appears that the movement behaviour of juvenile silky sharks is strongly influenced by the movement of drifting FADs in this region. Ghost fishing of silky sharks through entanglement in FADs was also investigated using data derived from PSATs as well as underwater visual censuses. Thirteen per cent of the tagged sharks became entangled in FADs and entangled sharks were observed in 35 percent of the 51 FADs surveyed. Using this information in conjunction with estimated time that sharks remained entangled in the FAD (from depth data from PSATs), and scaling up according to estimates of FAD numbers, it was found that between 480 000 and 960 000 silky sharks are killed annually in this manner in the Indian Ocean. Subsequent management measures in this region prevent the deployment of FADs with netting that could lead to entanglement. Overall, floating objects appear to play a significant role in the juvenile life stages of silky sharks in this region. While their association with floating objects is clearly advantageous in an evolutionary sense, under current tuna fishery trends, this behaviour is certainly detrimental for the population.
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Manoukian, Sarine. "Impacts of Artificial Reefs on Surrounding Ecosystems." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3223.

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Artificial reefs are becoming a popular biological and management component in shallow water environments characterized by soft seabed, representing both important marine habitats and tools to manage coastal fisheries and resources. An artificial reef in the marine environment acts as an open system with exchange of material and energy, altering the physical and biological characteristics of the surrounding area. Reef stability will depend on the balance of scour, settlement, and burial resulting from ocean conditions over time. Because of the unstable nature of sediments, they require a detailed and systematic investigation. Acoustic systems like high-frequency multibeam sonar are efficient tools in monitoring the environmental evolution around artificial reefs, whereas water turbidity can limit visual dive and ROV inspections. A high-frequency multibeam echo sounder offers the potential of detecting fine-scale distribution of reef units, providing an unprecedented level of resolution, coverage, and spatial definition. How do artificial reefs change over time in relation to the coastal processes? How accurately does multibeam technology map different typologies of artificial modules of known size and shape? How do artificial reefs affect fish school behavior? What are the limitations of multibeam technology for investigating fish school distribution as well as spatial and temporal changes? This study addresses the above questions and presents results of a new approach for artificial reef seafloor mapping over time, based upon an integrated analysis of multibeam swath bathymetry data and geoscientific information (backscatter data analysis, SCUBA observations, physical oceanographic data, and previous findings on the geology and sedimentation processes, integrated with unpublished data) from Senigallia artificial reef, northwestern Adriatic Sea (Italy) and St. Petersburg Beach Reef, west-central Florida continental shelf. A new approach for observation of fish aggregations associated with Senigallia reef based on the analysis of multibeam backscatter data in the water column is also explored. The settlement of the reefs and any terrain change are investigated over time providing a useful description of the local hydrodynamics and geological processes. All the artificial structures (made up by water-based concrete for Senigallia reef and mainly steel for St. Petersburg Beach reef) are identified and those showing substantial horizontal and/or vertical movements are analyzed in detail. Most artificial modules of Senigallia reef are not intact and scour signatures are well depicted around them, indicating reversals of the local current. This is due to both the wind pattern and to the quite close arrangement of the reef units that tend to deflect the bottom flow. As regards to the St. Petersburg Beach reef, all the man-made steel units are still in their upright position. Only a large barge shows a gradual collapse of its south side, and presents well-developed scouring at its east-northeast side, indicating dominant bottom flow from west-southwest to east-northeast. While an overall seafloor depth shallowing of about 0.30 m from down-current deposits was observed for Senigallia reef, an overall deepening of about 0.08 m due to scour was observed at the St. Petersburg Beach reef. Based on the backscatter data interpretation, surficial sediments are coarser in the vicinities of both artificial reefs than corresponding surrounding sediments. Scouring reveals this coarser layer underneath the prevalent mud sediment at Senigallia reef, and the predominant silt sediment at St. Petersburg Beach reef. In the ten years of Senigalia reef study, large-scale variations between clay and silt appear to be directly linked to large flood events that have occurred just prior to the change. As regards the water column investigation, acoustic backscatter from fish aggregations gives detailed information on their morphology and spatial distribution. In addition, relative fish biomass estimates can be extrapolated. Results suggest that most of the fish aggregations are generally associated with the artificial modules showing a tendency for mid- and bottom-water depth distribution than for the surface waters. This study contributes to understanding the changes in artificial reefs over time in relation to coastal processes. Moreover, the preliminary results concerning the water column backscatter data represents progress in fisheries acoustics research as a result of three-dimensional acoustics. They demonstrate the benefits of multibeam sonar as a tool to investigate and quantify size distribution and geometry of fish aggregations associated with shallow marine habitats.
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Haimeur, Adil. "Etude comparative de l’effet des microalgues marines et des huiles d’argan et de poisson sur le métabolisme lipidique et la fonction plaquettaire chez le rat et chez des patients dyslipidémiques : recherche de l'effet antiagrégant et exploration du mécanisme d'action dans le but de prévenir les maladies cardiovasculaires." Thesis, Le Mans, 2014. http://www.theses.fr/2014LEMA1033/document.

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Certains facteurs de risque, comme l’hyperlipidémie, l’hyper-agrégabilité des plaquettes sanguines et le stress oxydant favorisent la progression des maladies cardiovasculaires. L’objectif de ce travail est de comparer les effets des AGPI-LC issus de sources différentes (microalgue marine, huile d’argan et de poisson) sur l’installation du syndrome métabolique chez des rats soumis à un régime hyperlipidique. Les effets de l’huile d’argan sur la fonction plaquettaire et sur le bilan lipidique ont aussi été testés chez des patients dyslipidémiques. Une étude préliminaire sur des rats a été réalisée afin de rechercher la dose minimale de la microalgue (Odontella aurita) à incorporer dans le régime pour obtenir un effet positif sur les différents paramètres mesurés. Nous avons ensuite étudié l’effet du lyophilisat d’O. aurita sur les facteurs de risque cardiovasculaire induits par un régime hyperlipidique chez le rat. Les résultats ont montré, que l'apport d'O. aurita induit une diminution de la glycémie et des teneurs en lipides plasmatiques ainsi qu’une réduction de l'agrégation plaquettaire. Nous avons ensuite comparé les effets de cette microalgue avec l’huile de poisson. Pour cela une étude nutritionnelle a été réalisée chez des rats soumis à un régime hyperlipidique supplémenté ou non avec du lyophilisat d’O. aurita ou de l’huile de poisson. Il a ainsi été montré que la supplémentation en lyophilisat d’O. aurita et en huile de poisson diminue l’agrégation plaquettaire et le stress oxydatif. Nous avons par la suite comparé les effets de l’huile de poisson riche en oméga-3, et de l’huile d’argan riche en oméga-6 et oméga-9. Nos résultats montrent que les 2 sources diminuent l’agrégation plaquettaire et les facteurs de risque du syndrome métabolique mais leurs mécanismes d’action semblent être différent. En complément Nous avons sur l’huile d’argan, réalisé au Maroc une étude clinique pour rechercher l’effet antiagrégant et hypolipémiant chez des patients dyslipidémiques. Les résultats obtenus montrent une amélioration significative des lipides athérogènes chez les patients consommant de l'huile d’argan. Cette amélioration consiste en une baisse très significative des taux de cholestérol total et de LDL-cholestérol sériques auxquels s'ajoutent une diminution de l’agrégation plaquettaire et du stress oxydatif chez les patients consommant de l'huile d’argan
Some risk factors, such as hyperlipidemia, hyperaggregability of blood platelets and oxidative stress promotes the progression of cardiovascular disease. The objective of this study was to compare the effects of LC-PUFA from different sources (marine microalgae, argan oil and fish oil) on installing the metabolic syndrome in rats fed high fat diet. The effects of argan oil on platelet function and lipid profiles were also tested in dyslipidemic patients. A preliminary study was conducted to find the minimum dose of microalgae (Odontella aurita) to be incorporated in the diet for a positive effect on the different parameters measured. We then studied the effect of lyophilized O. aurita on cardiovascular risk factors induced by a high fat diet in rats. The results showed that the addition of O. aurita induces a reduction in blood glucose and plasma lipid levels and a reduction in platelet aggregation. We then compare the effects of microalgae with fish oil. For this, a nutritional study was conducted in rats subjected to a high fat diet (HF) supplemented or not with the freeze-dried O. aurita (HFOA) or fish oil (HFFO). Supplementation lyophilized O. aurita and fish oil decreases platelet aggregation and oxidative stress.We subsequently compared the effects of fish oil rich in omega-3, and argan oil which is rich in omega-6 and omega-9. Our results show that 2 sources of LC-PUFA decrease platelet aggregation and the risk factors of metabolic syndrome, but their mechanism of action appears to be different.We have also conducted a clinical study in Morocco to investigate the antiplatelet and lipid lowering effect of argan oil in patients with dyslipidemia. The results show a significant improvement in atherogenic lipids in patients consuming argan oil for 3 weeks. This improvement consists in a very significant reduction in total cholesterol and serum LDL cholesterol, with a decreased platelet aggregation and oxidative stress in patients consuming argan oil
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Sherman, Krista Danielle. "Integrative approaches for conservation management of critically endangered Nassau grouper (Epinephelus striatus) in The Bahamas." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/33061.

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Species conservation is typically founded upon a range of management strategies, which integrate both biological and socioeconomic data. In this thesis, population genetics, acoustic telemetry, spawning aggregation surveys and stakeholder assessments were used to address key knowledge gaps limiting effective conservation management for critically endangered Nassau grouper (Epinephelus striatus) stocks in The Bahamas. A panel of polymorphic microsatellite markers was optimised to assess the genetic population dynamics of more than 400 Nassau grouper sampled throughout the country. Microsatellite data indicate that contemporary Nassau grouper populations in The Bahamas are predominantly genetically diverse and weakly differentiated, but lack geographic population structure. Assessments of changes in effective population size (Ne) show substantive reductions in Ne within The Bahamas compared to historic values that are likely due to natural disturbances. Evidence for recent bottlenecks occurring in three islands as well as an active spawning site, along with higher inbreeding coefficients in two islands were also found, and can be attributed to more recent anthropogenic activities. Collapse of a historically important Nassau grouper fish spawning aggregation (FSA) was supported by both acoustic telemetry and spawning aggregation survey dives. Restriction-site-associated DNA sequencing (RAD-seq) of 94 Nassau grouper was used to explore intraspecific population dynamics, loci under selection and patterns of gene flow in The Bahamas. Genomic assessments of diversity were in accord with microsatellite data and examinations of gene flow support higher levels of connectivity in The Bahamas than was previously suggested. The increased resolution gained from assessments of genomic data support intraspecific population structuring that may be driven by differences in gene flow and putative loci under divergent selection. Telemetry data were successfully used to identify the origins of spawning adults, and support demographic connectivity through migrations between an active FSA in the central Bahamas and home reef habitats within the Exumas and a no-take marine protected area. Stakeholder assessments highlight the complexities of fisheries management within The Bahamas, with key stakeholders often exhibiting conflicting opinions regarding the status of Nassau grouper and the efficacy of management options. However, these groups mutually agree upon the need to better manage remaining Nassau grouper stocks within The Bahamas through science-grounded policies. Synthesis of these studies along with a review of fisheries governance in The Bahamas was used to develop a comprehensive national management plan for Nassau grouper to facilitate better conservation for remaining populations of this ecologically important marine species.
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Books on the topic "Fish aggregation"

1

Weerasooriya, K. T. Experiences with fish aggregating devices in Sri Lanka. Madras: Development of Small-Scale Fisheries in the Bay of Bengal, 1987.

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Beverly, S. Report of a pilot fish aggregation device (FAD) deployment off Port Moresby, Papua New Guinea, 27 June-8 August 1992. Noumea, New Caledonia: South Pacific Commission, 1993.

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Desurmont, Aymeric. Fish aggregation device (FAD) assistance programme: Report of visit to the Cook Islands, 23 November to 21 December 1990. Noumea, New Caledonia: South Pacific Commission, 1992.

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Petaia, S. Capture Section report of fish aggregating device (FAD) site survey, construction, and deployment assistance to the Fisheries Department of Tuvalu: Phase I, 7-24 October 1995 and Phase II, 17 May-7 June 1996. Noumea, New Caledonia: South Pacific Commission, Coastal Fisheries Programme, 1997.

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Chapman, L. B. Manual on fish aggregating devices (FADs). Noumea, New Caledonia: Secretariat of the Pacific Community, 2005.

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WECAFC Ad Hoc Working Group on the Development of Sustainable Moored Fish Aggregating Device Fishing in the Lesser Antilles. Meeting. Report of the Second Meeting of the WECAFC Ad Hoc Working Group on the Development of Sustainable Moored Fish Aggregating Device Fishing in the Lesser Antilles: Le Robert, Martinique, 8-11 October 2004. Rome: Food and Agriculture Organization of the United Nations, 2007.

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International Workshop on the Ecology and Fisheries for Tunas Associated with Floating Objects (1992 La Jolla, San Diego, Calif.). Proceedings of the International Workshop on the Ecology and Fisheries for Tunas Associated with Floating Objects, February 11-13, 1992. La Jolla, Calif: Inter-American Tropical Tuna Commission, 1999.

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Western Central Atlantic Fishery Commission. Ad Hoc Working Group on the Development of Sustainable Moored Fish Aggregating Device Fishing in the Lesser Antilles. Meeting. Report of the First Meeting of the WECAFC Ad Hoc Working Group on the Development of Sustainable Moored Fish Aggregating Device Fishing in the Lesser Antilles: Le Robert, Martinique, 8-11 October 2001. Rome: Food and Agriculture Organization of the United Nations, 2002.

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Beverly, S. Capture Section report of Wallis and Futuna fish aggregating device (FAD): Technical assistance projects : 25 August to 15 September 1992, 7-11 November 1992, and 23-29 July 1995. Noumea, New Caledonia: Secretariat of the Pacific Community, 1999.

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Benson, Brian L. Application and evaluation of habitat enhancement and fish aggregation technologies in Washington's developing coastal recreational fisheries. Olympia, WA: State of Washington, Dept. of Fisheries, Marine Fish Program, 1986.

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Book chapters on the topic "Fish aggregation"

1

Baudena, Alberto, Francesco d’Ovidio, Guido Boffetta, and Silvia De Monte. "Frontal Systems as Mechanisms of Fish Aggregation." In First Complex Systems Digital Campus World E-Conference 2015, 183–86. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45901-1_19.

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Colin, Patrick L. "Aggregation Spawning: Biological Aspects of the Early Life History." In Reef Fish Spawning Aggregations: Biology, Research and Management, 191–224. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1980-4_7.

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Colin, Patrick L. "Timing and Location of Aggregation and Spawning in Reef Fishes." In Reef Fish Spawning Aggregations: Biology, Research and Management, 117–58. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1980-4_5.

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Hamner, William Marion, and John Louis Largier. "Oceanography of the Planktonic Stages of Aggregation Spawning Reef Fishes." In Reef Fish Spawning Aggregations: Biology, Research and Management, 159–90. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1980-4_6.

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Russell, Martin W., Brian E. Luckhurst, and Kenyon C. Lindeman. "Management of Spawning Aggregations." In Reef Fish Spawning Aggregations: Biology, Research and Management, 371–404. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1980-4_11.

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Molloy, Philip Patrick, Isabelle M. Côté, and John D. Reynolds. "Why Spawn in Aggregations?" In Reef Fish Spawning Aggregations: Biology, Research and Management, 57–83. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1980-4_3.

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de Mitcheson, Yvonne Sadovy, and Brad Erisman. "Fishery and Biological Implications of Fishing Spawning Aggregations, and the Social and Economic Importance of Aggregating Fishes." In Reef Fish Spawning Aggregations: Biology, Research and Management, 225–84. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1980-4_8.

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Domeier, Michael L. "Revisiting Spawning Aggregations: Definitions and Challenges." In Reef Fish Spawning Aggregations: Biology, Research and Management, 1–20. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1980-4_1.

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Colin, Patrick L. "Studying and Monitoring Aggregating Species." In Reef Fish Spawning Aggregations: Biology, Research and Management, 285–329. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1980-4_9.

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Hamilton, Richard, Yvonne Sadovy de Mitcheson, and Alfonso Aguilar-Perera. "The Role of Local Ecological Knowledge in the Conservation and Management of Reef Fish Spawning Aggregations." In Reef Fish Spawning Aggregations: Biology, Research and Management, 331–69. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1980-4_10.

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Conference papers on the topic "Fish aggregation"

1

Sprague, Mark, and Joseph Luczkovich. "Modeling fish aggregation sounds in very shallow water to estimate numbers of calling fish in aggregations." In 161st Meeting Acoustical Society of America. Acoustical Society of America, 2012. http://dx.doi.org/10.1121/1.4730158.

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VREEKEN, J., and M. R. HARDEMAN. "FISH AND PLATELETS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643404.

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The effect of two different amounts of a fish oil, corresponding to 0.75 g (2.5 mmol) and 1.5 g (5 mmol) of eicosapentaenoic acid respectively, added in a cross-over design to the normal diet of 16 healthy male volunteers, was studied. Of the various parameters investigated, the most important appeared to be a new test: “Transient Aggregation Resistance” (TAR) of platelets, a phenomenon which, due to its short half life, is hardly measured when platelet aggregation is studied according to the classic method (see M.R.Hardeman, TAR determination, this congress). Under the influence of fish oil, the half life of TAR was found significantly prolonged. This prolongation, however, was not related to the amount of fish oil used. A highly significant decrease of triglycerides was found, the effect being most pronounced in subjects with triglycerides starting values >1.0 uM. This decrease was related to the amount of fish oil used. These.results may cast light on controversies found in literature concerning the effect of fish oil on platelet aggregation . They can also help to clarify controversies about the effect of fish consumption on cardiac mortality.
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Yongming Yang and Yantao Tian. "Swarm robots aggregation formation control inspired by fish school." In 2007 IEEE International Conference on Robotics and biomimetics (ROBIO). IEEE, 2007. http://dx.doi.org/10.1109/robio.2007.4522266.

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Houwelingen, A. C. V., A. Hennissen, F. Verbeek-Schlppers, T. Simonson, S. Fischer, and G. Hornstra. "INFLUENCE OF DIETARY FISH ON PLATELET FUNCTION AND THROMBOXANE FORMATION." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643803.

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Many studies have been performed with respect to the effects of fish (products) on the possible prevention of ischemic cardiovascular disease in man. Most of the trials, however, were poorly designed without a proper control group, and their results are equivocal. We, therefore, performed a well- controlled intervention trial to investigate the effect of a reasonable amount of dietary fish on certain risk indicators of arterial thrombogenesis. In Tromstf, Maastricht and Zeist, healthy male volunteers were given a dietary supplement consisting of 135 g of canned mackerel (n=40) or meat paste (control, n=42) per day for a period of 6 weeks. Compliance was monitored on the basis of the urinary excretion of lithium, added to the supplements. Average compliance was about80% and decreased slightly with time. Bleeding time was significantly prolonged and platelet number decreased in the mackerel group.Platelet aggregation inPRP induced by thrombin decreased only at a low dose.Collagen-induced platelet aggregation in PRP decreased significantly. This was associated with a 50% reduction of the collagen-induced TxB2 formation in PRP(P < 0.001). TxB3 synthesis increased significantly in the mackerel group from 0.9 to 7.8% of the TxB2 production (GC/MS). Collagen- induced platelet aggregation and ATP release in whole blood were measured with the Chronolog whole blood lumiaggregometer (Maastricht only). In the same samples TxB2 formtion was measured (RIA) and although a significant reduction was seen in the mackerel group, platelet functionswere not significantly altered. However, platelet release (but not aggregation) was significantly related to the compliance and a decreasing effect of the mackerel supplement was observed in those 50% of the volunteers having the highest compliance. This demonstrates the necessity of monitoring compliance by objective means. Acknowledgements: Financial support was obtained from the Dutch Heart Foundation. The International Association of Fish Meal Manufactures (Potters Bar, Herts, England) provided the mackerel.
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Du, Nan, Supriya D. Mahajan, Bindukumar B. Nair, Stanley A. Schwartz, Chiu B. Hsiao, and Aidong Zhang. "An Artificial Fish Swarm based Supervised Gene Rank Aggregation Algorithm for Informative Genes Studies." In Computational Intelligence and Bioinformatics / Modelling, Simulation, and Identification. Calgary,AB,Canada: ACTAPRESS, 2011. http://dx.doi.org/10.2316/p.2011.753-019.

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Du, Nan, Supriya D. Mahajan, Bindukumar B. Nair, Stanley A. Schwartz, Chiu B. Hsiao, and Aidong Zhang. "An Artificial Fish Swarm based Supervised Gene Rank Aggregation Algorithm for Informative Genes Studies." In Computational Intelligence and Bioinformatics / Modelling, Simulation, and Identification. Calgary,AB,Canada: ACTAPRESS, 2012. http://dx.doi.org/10.2316/p.2012.753-019.

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Simonsen, T., Å. Vårtun, V. Lyngmo, G. Hornstra, and A. Nordøy. "SERUM PREPARED AFTER DAILY INTAKE OF FISH INHIBITS PGI-2 PRODUCTION BUT NOT PLATELET INHIBITORY ACTIVITY OF ENDOTHELIAL CELLS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643401.

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Healthy males were given dietary supplement of 100 g mackerelpasta for six weeks. Controlls were given meatpasta. Blood were collected before and at the end of the dietary intervention. Fatty acid composition of total phospholipids in serum and free fatty acids were measured by GLCHuman endothelium cells were grown in medium supplemented with 10% serum prepared from blood of the mackerel and controll groups. The medium was then examined for PGI-2 by RIA of 6-Keto-PGFIα , and for platelet aggregation inhibitory activity (PAIA) measured as inhibition of collagen induced platelet aggregation in platelet rich plasma.Fatty acids of total phospholipids and FFA of serum showed a significant decrease in the ratio of Arachidonic acid (20:4 n-6) to Eicosapentaenoic acid (20:5 n-3) in the mackerel group.The 6-Keto-PGFlα was significantly lower in the medium added serum from the mackerel group at the end of the period than at start. PAIA was not reduced by serum collected after fish consumption.We conclude that dietary fish contribute to factors in serum, inhibiting PGI-2 production in endothelial cells in vitro. However, the ability of endothelial cells to inhibit platelet aggregation was not affected
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8

Aureli, Matteo, Francesca Fiorilli, and Maurizio Porfiri. "Interactions Between Fish and Robots: An Experimental Study." In ASME 2010 Dynamic Systems and Control Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/dscc2010-4098.

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In this paper, we present an experimental study of gregarious fish collective behavior in the presence or absence of biomimetic vehicles. This study is aimed at developing a first understanding of fish shoal controllability using robotic exogenous mates. Macroscopic features of the group schooling are identified through laboratory experiments, conducted in a controlled environment. Experimental evidence proves the existence of qualitatively different shoal collective responses to the exogenous mate. We adapt global observables from statistical mechanics to capture the main features of the shoal collective motion, and identify possible distinct states of aggregation. Further, we investigate the effect of the exogenous mate on the shoal by using a diffusion mapping analysis performed on the global observables. The analysis shows that the exogenous mate is able to exert organizing control actions on the schooling behavior that generally result into a higher cohesion for the shoal.
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9

Simonsen, T., Å. Vårtun, V. Lyngmo, and A. Nordθy. "CORNARY HEART DISEASE, DIET, SERUM LIPIDS, PLATELET FUNCTION AND PLATELET FATTY ACIDS IN TWO POPULATIONS WITH A HIGH AND A LOW INTAKE OF DIETARY FISH." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643806.

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In the coastal areas of Northern Norway the intake of fish is by tradition high whereas in the inland area it is low. We have examined the mortality of CHD in the period 1975-84 in a coastal community (C) and an inland community (I). In addition we have examined 30 healthy male subjects aged 30-year, selected by random in the two communities. The examination included a dietary survey based on registration and weighing of all dietary items for one week, blood pressure, serum lipids, primary bleeding time, platelet aggregation induced by collagen and fatty acid composition of platelet total phospholipids.The age-adjusted mortality of CHD was significantly higher for age groups 30-70 year in C whereas the opposite was found above 70 years of age. The mean intake of fish per day was 134 g (0.9 g eicosapentaenoic acid-EPA) in C and 53 g (0.25 g EPA) in I. Serum triglycerides was higher in C (p<0.05) whereas totalcholesterol was similar. The primary bleeding time was not different in the two areas. Significantly lower concentrations of collagen was needed to induce 30 and 60% aggregation in platelet rich plasma in C than in I. No significant differences in the content of eicosapentaenoicacid (EPA) was observed in platelet total phospholipid fatty acids. This study has not confirmed that a high intake of fish as a singledietary variant, is associated with a low mortality of CHD. The lack of changes in plasma lipids, platelet fatty acid composition between representative groups from the two populationsindicate that other factors mask the possible beneficial effects of a high fish diet. Furthermore, the daily intake of large amounts of lean fish give only a very moderate increase in dietary intake of EPA.
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10

Matsumi, Yoshiharu, and Akira Seyama. "The Fundamental Study to Reduce the Settled Area of the Fish Aggregation Devices on the Sea Floor Thrown from a Ship." In 21st International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1989. http://dx.doi.org/10.1061/9780872626874.219.

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Reports on the topic "Fish aggregation"

1

Love, Richard H. Broadband Clutter due to Aggregations of Fish. Fort Belvoir, VA: Defense Technical Information Center, January 2015. http://dx.doi.org/10.21236/ada616041.

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2

Horne, John K., and J. M. Jech. Modeling and Measuring Acoustic Backscatter from Fish Aggregations. Fort Belvoir, VA: Defense Technical Information Center, September 1999. http://dx.doi.org/10.21236/ada629870.

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3

Gauss, Roger C., and Richard H. Love. Moment-Based Physical Models of Broadband Clutter due to Aggregations of Fish. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada598811.

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Kramer, Sharon H., Christine D. Hamilton, Gregory C. Spencer, and Heather O. Ogston. Evaluating the Potential for Marine and Hydrokinetic Devices to Act as Artificial Reefs or Fish Aggregating Devices. Based on Analysis of Surrogates in Tropical, Subtropical, and Temperate U.S. West Coast and Hawaiian Coastal Waters. Office of Scientific and Technical Information (OSTI), May 2015. http://dx.doi.org/10.2172/1179455.

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