Species Of Fish Caught Research Articles

자연산 어류의 시장 통합성 분석

This study is aimed to estimate market integration of wild caught fish species on the Korean market, using both multivariate and bivariate cointegration analysis. For the analysis of market integration between wild caught fish species, major four fish species those are most popular fish in the market and caught by the large purse seine fishery-chub mackerel, jack mackerel, hairtail and spanish mackerel-were selected as analytical target fish species. And their real monthly price data from January 2000 to December 2011 were used in the analysis. The results of the multivariate cointegration test for four wild caught fish species showed that there would be long-term equilibrium relationships among prices of four wild caught fish species, and consequently, the markets for wild caught fish species were estimated to be integrated. The results of exclusion test and bivariate cointegration test also supported that there would be a clear evidence to suggest that all target wild caught fish species were cointegrated each other.

A brief introduction to the issue of climate and marine fisheries

Climatic variability has profound effects on the distribution, abundance and catch of oceanic fish species around the world. The major modes of this climate variability include the El Nino-Southern Oscillation (ENSO) events, the Pacific Decadal Oscillation (PDO) also referred to as the Interdecadal Pacific Oscillation (IPO), the Indian Ocean Dipole (IOD), the Southern Annular Mode (SAM) and the North Atlantic Oscillation (NAO). Other modes of climate variability include the North Pacific Gyre Oscillation (NPGO), the Atlantic Multidecadal Oscillation (AMO) and the Arctic Oscillation (AO). ENSO events are the principle source of interannual global climate variability, centred in the ocean–atmosphere circulations of the tropical Pacific Ocean and operating on seasonal to interannual time scales. ENSO and the strength of its climate teleconnections are modulated on decadal timescales by the IPO. The time scale of the IOD is seasonal to interannual. The SAM in the mid to high latitudes of the Southern Hemisphere operates in the range of 50–60 days. A prominent teleconnection pattern throughout the year in the Northern Hemisphere is the North Atlantic Oscillation (NAO) which modulates the strength of the westerlies across the North Atlantic in winter, has an impact on the catches of marine fisheries. ENSO events affect the distribution of tuna species in the equatorial Pacific, especially skipjack tuna as well as the abundance and distribution of fish along the western coasts of the Americas. The IOD modulates the distribution of tuna populations and catches in the Indian Ocean, whilst the NAO affects cod stocks heavily exploited in the Atlantic Ocean. The SAM, and its effects on sea surface temperatures influence krill biomass and fisheries catches in the Southern Ocean. The response of oceanic fish stocks to these sources of climatic variability can be used as a guide to the likely effects of climate change on these valuable resources.

A step-by-step framework to assess benefits of established temperate marine protected areas

Marine protected areas (MPAs) have been advocated as a solution to the challenges of both conservation and modern fishery management, but their application remains controversial, partly because there are only general guidelines for evaluating their effectiveness. We propose a framework to specifically evaluate established MPAs in six steps. We tested the approach by reviewing published research and unpublished information on the Goukamma MPA in the centre of the South African temperate south coast. Information reviewed included effects on the structure of fish populations, catch and abundance indices of fish species, and ecosystem effects. We investigated factors that determine the usefulness of a MPA in fisheries management, including the movement behaviour of adult fishes, larval dispersal and fisher-displacement patterns. We found that differences in the rates of exploitation across the MPA border resulted in differences in abundance, size and condition of the main target species, roman (Chrysoblephus laticeps). The diversity and abundance of non-target fish species, and the composition of the benthic invertebrate community, were affected by the cessation of fishing. The potential for ‘spillover’ of adult roman might be limited to the vicinity of the MPA by their small home range, but there is potential for self-seeding and dispersal of roman eggs and larvae over wider areas. These theoretical considerations were confirmed by an analysis of catch data from before and after MPA implementation. The framework presented here may help to identify and fill gaps in the knowledge of established MPAs along South Africa’s temperate south coast.

34 years of investigation in the Rhine River at Ludwigshafen, Germany – trends in Rhine fish populations

BackgroundThe Rhine-Neckar region is one of the most urbanised areas along the Rhine River and the world's largest industrial site, BASF SE, is located here at Ludwigshafen am Rhein. When the water quality dropped to its lowest values in the 1970s, BASF SE implemented a sewage treatment plant at its production site. In addition, electrofishing at this site has been carried out at regular intervals since 1976 in order to monitor changes in the fish population, whereby clear trends in both fish diversity as well as abundance have been noted.ResultsEspecially rheophilic fish species such as asp Aspius aspius (L.), barbel Barbus barbus (L.) and nase Chondrostoma nasus (L.) which were rarely found during the first catching period (1976 – 1980) were then caught in increasing numbers and abundance. Starting with 6 to 8 fish species per catch in the 1970s, the number has raised to 25 fish species (including 4 neozoans) in recent catches. Overall 31 species have been monitored in the last 34 years.ConclusionsThis indicates good river water quality and an increase in fish biodiversity along the BASF site at Ludwigshafen over the last three decades. However, focussing on the past decade, new invasive fish species such as the sunfish Lepomis gibbosus (L.) and three gobies have been found in high densities along the river banks which might have an impact on the fish population in this area in the future.

Dynamics of biological parameters of nonmigratory and invader fish in the basin of the lower Tom’ River

The species composition and dominating complexes of fish in catches are considered. The fraction of mass fish species in catches is shown (for small rivers and the channel zone). The structural (size and age) and functional (fertility) parameters of some nonmigratory and invader fish species are characterized. Main biological parameters are considered in the time-space aspect over the widespread and numerous fish species.

Assessing the roles of environmental factors in coastal fish production in the northern Baltic Sea: A Bayesian network application

Environmental conditions play a crucial role in the distribution and abundance of fish species in any area. Much research has been attributed to the requirements and tolerance limits of commercially exploited fish species. It is rare, however, that studies have been able to address the relative importance of potentially restrictive environmental factors; extensive enough to allow for estimation of the effect of several environmental factors through the fishes' life span. The coastline of Finland in the northern Baltic Sea offers a unique natural experimental setting that can be used to assess the relative importance of various environmental factors for the species occupying it. The area includes major variations in several crucial environmental factors: salinity, temperature regime, represented by winter ice duration, coastline characteristics, and eutrophic status. Furthermore, Finland has collected extensive and spatially representative data of water quality and environmental factors, as well as a long and extraordinarily spatially detailed data set of commercial catches of several fish species. In this article, we make an attempt to correlate the environmental data to the commercial catches of fish species, assuming that the commercial catches reflect, to some reasonable degree, the productivity of that species in that area (compared to other areas and combinations of environmental factors, not to other species). We use a Bayesian network approach to examine the sensitivity of the species to the environmental factors.

Diet of the harbour seal (Phoca vitulina vitulina) in the west and south-west of Ireland

Although the harbour seal (Phoca vitulina vitulina) is relatively common in coastal waters of the Republic of Ireland, it remains largely unstudied. Issues including potential interactions with coastal fisheries and the occurrence of phocine distemper virus outbreaks in 1988 and 2002 have highlighted the need to increase our knowledge of the ecology of these animals. The diet of harbour seals was investigated using a combination of approaches: hard-part analysis of scat contents and fatty-acid analysis. A total of 102 scat and 13 blubber samples were collected from two locations in Ireland and were analysed following standard methodologies. Results from scat analysis indicate that the seals are opportunistic, generalist feeders, and probably consume prey in relation to its availability. Eighteen prey species were identified, with sandeels (Ammodytidae spp.) constituting 55% of the prey items by number. Biomass of prey was reconstructed using otolith-length regression equations, with and without the application of digestion correction factors and sole (Solea solea) (16.1%), sandeels (15.2%), andTrisopterusspecies (12.4%) were found to be the most important species by weight. Rarefraction curves were used to determine prey species diversity on a sample site basis and we used accumulation curves to ascertain whether sampling was sufficient on a site basis. Sixty-four fatty acids were isolated from the blubber and analysis of the fatty-acid profiles revealed the possible influence of season, seal weight and sex on the seals' long-term diet. Some of the prey species recorded in the diet overlap with commercially and recreationally caught fish species in Ireland; however, there was little overlap with marketed size-ranges.

The Long-term variation of Ruff Catches in the Curonian Lagoon

The paper presents data on some biological indices, i.e. size and age structure, of ruff in the Curonian Lagoon throughout 1993–2006. It analyses year-to-year dynamics of ruff catches, identifies the factors determining their abundances, and examines possible reasons for variation in ruff stocks. The size of ruff spawning shoals was found to have no effect on ruff reproduction. Pikeperch and pike stocks were the most important determinants limiting ruff abundance. Ruff catches increased up to several thousand tons in the years when pikeperch catches were below 50–70 t. Effectiveness of ruff spawning was dependent on the course of spring and water yield in summer. Below-zero temperatures and increased water yield of the Nemunas River in March created favourable conditions for ruff reproduction and abundance. Similar natural conditions for reproduction can explain similar catches of fish species belonging to different ecological groups, such as ruff and smelt.

Aspects of the hematology of fishes caught in contaminated water bodies

A study was carried out to determine aspects the hematological profiles of different species of fish caught in fresh water systems at Bodu and Choba in Rivers State, Nigeria. Cardiac blood was collected from 20 fishes per specie and subjected to hematological analyses which included hemoglobin concentration (Hb), packed cell volume (PCV), white blood cell counts (WBC) and Glutathione-S-tranferase (GST). Catfish had the highest hemoglobin value (14.6 ± 3.5 g/100 ml), while Mudskipper and African Sleeper had the least (3.3 ± 1.3 and 2.9 ± 0.6 g/100 ml respectively). Similarly, the highest PCV value (43.9%) was recorded in Catfish, while the African Sleeper had the least (8.6%). The Mudskipper and African Sleeper on the other hand had the highest white blood cell values of 4.8 ± 0.9 and 4.2 ± 0.8 respectively. Glutathione - S transferase value for the Mudskipper at 24.9 ± 2.1 μl was highest while the 6.3 ± 0.6 μl recorded in Catfish was the least. Keywords : fishes, hematological profile, and glutathione-s- transferase, Nigeria Animal Production Research Advances Vol. 1(2) 2005: 102-103

The Impact of the Extreme Floods in July 1997 on the Ichthyocenosis of the Oder Catchment Area (Czech Republic)

Changes in the ichthyocenosis of five smaller streams of 2nd to 4th order existing in the spring section of the River Odra (Oder) catchment area, in the territory of the Czech Republic, were observed before and after the catastrophic floods of July 1997. Quantitative catches using electro-fishing were performed in June, August, and September 1997, i.e. a month before and 2 months after the floods. The maximum flow of water in the examined sites usually reached or exceeded the limit of the so-called ȁ8once in a century high waterȁ9. Extreme floods did not influence statistically the proven average readings of species diversity of ichthyocenosis in the examined sites (p = 0.5625), species variety (p = 0.7316), abundance per hectare (p = 0.3125), and biomass per hectare (p = 0.4375). A distinctive decline in abundance and also in the biomass of the ichthyocenosis took place in geomorphic reaches. Significant incisions and alterations in the routes of the streams were also observed. Statistical data of catches of key reophilous fish species from the River Oder catchment basin, all of which were affected by the floods, in the periods 1995–1996, 1997, and 1998–1999, were evaluated. Catches of the species of Salmo trutta and Thymallus thymallus in 1997 considerably increased. Only Thymallus thymallus experienced a more pronounced decrease in the years after the floods, when compared with the average readings made in the period 1995–1996. The readings of the adult abundance of Barbus barbus and Chondrostoma nasus did not prove a negative impact of the floods on the adult population of both species in the assessed years. Our findings suggest that the original fish communities may be naturally well adapted to culmination flows.

Do scientists and fishermen collect the same size fish? Possible implications for exposure assessment

Recreational and subsistence fishing plays a major role in the lives of many people, although most Americans obtain their fish from supermarkets or other commercial sources. Fish consumption has generally increased in recent years, largely because of the nutritional benefits. Recent concerns about contaminants in fish have prompted federal and state agencies to analyze fish (especially freshwater fish targeted by recreational anglers) for contaminants, such as mercury and polychlorinated biphenyls (PCBs), and to issue fish consumption advisories to help reduce the public health risks, where warranted. Scientists engaged in environmental sampling collect fish by a variety of means, and analyze the contaminants in those fish. Risk assessors use these levels as the basis for their advisories. Two assumptions of this methodology are that scientists collect the same size (and types) of fish that fishermen catch, and that, for some contaminants (such as methylmercury and PCBs), levels increase with the size and age of the fish. While many studies demonstrate a positive relationship between size and mercury levels in a wide range of different species of fish, the assumption that scientists collect the same size fish as fishermen has not been examined. The assumption that scientists collect the same size fish as those caught (and eaten) by recreationalists or subsistence fishermen is extremely important because contaminant levels are different in different size fish. In this article, we test the null hypothesis that there are no differences in the sizes of fish collected by Aleut fishermen, scientists (including divers), and commercial trawlers in the Bering Sea from Adak to Kiska. Aleut fishermen caught fish using rod-and-reel (fishing rods, hook, and fresh bait) from boats, as they would in their Aleutian villages. The scientists collected fish using rod-and-reel, as well as by scuba divers using spears up to 90 ft depths. A fisheries biologist collected fish from a research/commercial trawler operated under charter to the National Oceanographic and Atmospheric Administration (NOAA). The fish selected for sampling, including those caught commercially in the Bering Sea, represented different trophic levels, and are species regularly caught by Aleuts while fishing near their villages. Not all fish were caught by all three groups. There were no significant differences in length and weight for five species of fish caught by Aleuts, scientists, and fisheries trawls, and for an additional 3 species caught only by the Aleut and scientist teams. There were small, but significant, differences in the sizes of rock greenling ( Hexagrammos lagocephalus) and red Irish lord ( Hemilepidotus hemilepidotus) caught by the scientist and Aleut fishermen. No scientists caught rock greenling using poles; those speared by the divers were significantly smaller than those caught by the Aleuts. Further, there were no differences in the percent of males in the samples as a function of fishing method or type of fishermen, except for rockfish and red Irish lord. These data suggest that if scientists collect fish in the same manner as subsistence fishermen (in this case, using fishing rods from boats), they can collect the same-sized fish. The implications for exposure and risk assessment are that scientists should either engage subsistence and recreational fishermen to collect fish for analysis, or mimic their fishing methods to ensure that the fish collected are similar in size and weight to those being caught and consumed by these groups. Further, total length, standard length, and weight were highly correlated for all species of fish, suggesting that risk assessors could rely on recreational and commercial fishermen to measure total lengths for the purpose of correlating mercury levels with known size/mercury level relationships. Our data generally demonstrate that the scientists and trawlers can collect the same size fish as those caught by Aleuts, making contaminant analysis, and subsequent contaminant analysis, representative of the risks to fish consumers.

Dynamics of the Fish Community Structure in the Lithuanian Coastal Zone of the Baltic Sea on the Basis of the Monitoring Programme

Coastal fish monitoring has been carried out in the Lithuanian zone of the Baltic Sea in the area to the north of Palanga since 1993. Investigations were performed annually using gill net series at fixed sites in July–August. Eighteen fish species were caught according to the monitoring programme. Coastal areas were dominated by diadromous vimba (Vimba vimba (L.)), the marine species Baltic herring (Clupea harengus membras L.) and river flounder (Platichthys flesus (L.)). The comparison of experimental catches of different years revealed considerable changes in fish species composition, abundance and biomass. Catches of typical coastal fish species in experimental gears were considerably higher than those of recent years, e.g. the abundance of turbot (Psetta maxima (L.)) and river flounder in catches was found to be declining. Meanwhile catches of freshwater and diadromous fish species, such as perch (Perca fluviatilis L.), pikeperch (Sander lucioperca (L.)), vimba and twaite shad (Alosa fallax fallax (La...

Sportsfish Consumption Surveys: A Risk Assessment Practitioner's Wish List

ABSTRACT In the United States, risk assessments that include sportsfish consumption often rely on default values derived by the USEPA. However, local, regional, and cultural differences can result in substantial differences in consumption rates, species of fish caught, parts of fish consumed, and fish preparation methods—all of which contribute to the extent of contaminant exposure. Because of these differences, site-specific data are important for the reliable prediction of exposure. This article reviews the types of information important to a risk assessor to enhance the applicability of the exposure assessment to the population being evaluated. It provides a method for setting priorities based on the sensitivity of the exposure assessment to each type of information. Consumption rate and parts of fish consumed are the most important information to obtain. This information should be obtained for each fish species consumed, and should be obtained for both children and adults. Body weight and exposure duration have the next level of priority, and cooking method has the lowest level of priority. Results from surveys should be presented in a manner that allows the reader to understand the variability observed in the data and the survey questions that were asked. Correlations between variables should be evaluated and presented.

Studying species associations from commercial catch data: a Baltic Sea application

Finland has 1100 km coast line with relatively strong environmental gradients. Finland has also gathered exceptionally comprehensive data on commercial catches of several fish species along the coast in relatively small units. Multidimensional scaling was applied to these data to test the hypothesis that the effects of the environmental gradients to the abundance and species composition of fish can be seen in the catches. This analysis divided the species into three groups: marine species, salmonid species and coastal species groups, the reproduction biology being the connecting factor between the species in each group. This implies that the reproduction success in a given environment is the main factor affecting the productivity and distribution of species along the coast of Finland. The commercial catch data proved informative in regard to the ecological similarity of the species.

Long‐term changes in the abundance of Jesogammarus annandalei (Tattersall) in Lake Biwa

Changes in the abundance of an endemic amphipod, Jesogammarus annandalei, that inhabits the profundal zone of Lake Biwa were examined from 1966 to 1999. The abundance of J. annandalei increased suddenly during the mid‐1980s and thereafter stayed at a level that was seven‐fold higher than that before 1980. Compared with the amphipod in the 1960s, both the clutch and body size of the matured individuals decreased during the 1990s, which suggests that per capita food supply decreased. Thus, the increase in the abundance of J. annandalei appeared to be due largely to an increase in their survival rate and not their growth or reproduction rates. In accord with the increase in amphipod abundance, the fishery catch of an endemic gobiid fish species that is dominant in the profundal zone and preys on this amphipod as a major food, decreased dramatically during the mid1980s. These results suggest that long‐term changes in abundance of J. annandalei in Lake Biwa are mainly regulated by fish predation rather than by food supply.

Heavy metals in fish ( Solea vulgaris, Anguilla anguilla and Liza aurata) from salt marshes on the southern Atlantic coast of Spain

Comparisons were made of metal concentrations in water and sediment with those in the muscle and livers of three species of fish caught in four seawater reservoirs (two in the Odiel estuary and two in the Bay of Cádiz). The concentrations of a large number of metals in the water, sediment and fish were higher in the Odiel reservoirs than in those in Cádiz. We found high metal-enrichment factors in the livers as compared to muscle (over 100 for Fe and Cu and around 5 for Zn, Ni, Cd and Pb). The three fish species showed differences in metal content. For example, eels accumulated more metals in muscle and grey mullet in the liver. The metal levels found in muscle in the three species were below the legal limits for human consumption, although Cu in the liver was above the limit in the three species taken from the Odiel reservoirs, and Zn levels in liver were over the maximum in eels from one of the Odiel marshes. Significant correlations ( p<0.05) were obtained for the levels of numerous metals in water, sediment and fish.

Population assessment of sockeye salmon Oncorhynchus nerka caught by recreational angling and commercial fishery in Lake Toya, Japan

We carried out mail and access point surveys to estimate the catch numbers, angling effort of recreational angling and the population of sockeye salmon Oncorhynchus nerka in Lake Toya in 1998 and 1999. The mail survey questions in questionnaires distributed to anglers with a recre- ational angling license included date of angling, caught fish species and size, and catch number. In the access point survey we also asked anglers if they had a license. We measured the fork length and weight of caught fish. The catch rate (catch number in a day by each angler) from both surveys showed no significant difference, suggesting no bias for the catch rate between surveys. The esti- mated total angling effort was 1760 people (1998), and 1516 people (1999). The estimated recre- ational catch was 28 889 (1998) and 5455 (1999), that is, two or three times larger than the commercial catch. The fish population was estimated by using the DeLury method as 60 262 (1998) and 10 806 (1999). The total exploitation rate was 62% (1998) and 78% (1999). The size of caught fish was much larger in 1999 than 1998 because of the difference in age composition.

Catch and Bycatch of Sea Birds and Marine Mammals in the Small‐Scale Fishery of Punta San Juan, Peru

Abstract: Between 1991 and the present, we have had observers stationed at the port of San Juan in southern Peru to interview fishers as they landed their catch. They observed the landings of 922 Humboldt Penguins ( Spheniscus humboldti), 510 dusky dolphins ( Lagenorhynchus obscurus), 214 Burmeister's porpoises ( Phocaena spinnipinnis), and 75 bottlenose dolphins ( Tursiops truncatus) between November 1991 and June 1998, although the retention of penguins and small cetaceans is banned by Peruvian law. Most of these animals were captured in 1992–1994, when the fishers were mainly using surface‐drift gillnets to target a pelagic schooling fish called cojinova ( Seriolella violacea). Capture rates were much lower in 1995–1998, when fishers were mostly using fixed demersal gillnets and shellfish diving, due apparently to a lack of surface‐schooling cojinova in the vicinity. We used generalized linear models to examine the effect of year, gear type, area, and target fish species on the probability of capturing either penguins or dolphins. We found that the probability of a fishing vessel capturing a penguin or a dolphin increased when drift gillnets were used instead of fixed gillnets. Fishing area, year, and the species of fish caught also significantly affected the probability of capture. A population model ( Vortex) applied to Humboldt Penguins showed that the high levels of mortality seen in the early 1990s are not sustainable and could lead to local extinction in a few years. The mortality levels seen in the late 1990s are more likely to be sustainable, but a return to the use of drift gillnets would rapidly result in unsustainable levels of mortality.

A field experiment using acoustic alarms (pingers) to reduce harbour porpoise by-catch in bottom-set gillnets

A field experiment with Dukane NetMark™ 1000 pingers was conducted in the bottom-set gillnet fishery for cod in the Swedish Skagerrak Sea between March and April 1997. The aim of the experiment was to evaluate (i) the effectiveness of pingers to reduce by-catch rate of harbour porpoises, and (ii) the effects of pingers on the catches of the target species in the fishery. The design of the study was based on a statistical power analysis and the results from observer programmes conducted 1995-1996 in the same area, fishery and time of year.The catches of cod, pollack and other fish species were not affected by the sound of the pingers in the active strings. No harbour porpoise was caught in any control or active string, which was a significantly lower by-catch rate than in the two previous years. This could not be explained by a reduction in fishing effort per se, a difference in the total catch of fish for consumption or a shift in the spatial distribution of the sets between the observer programmes and the pinger experiment. However, the spatial analyses demonstrated that the experimental strings were set parallel to the coast and along the 50 m isobath, and that the audible range of the active pingers on average covered 16% of the longitudinal length and 5% of the surface area of the experimental fishing area. A compilation of herring landings by Swedish fishermen operating in the Skagerrak Sea 1995-1997 suggests that herring were more abundant in 1997 than in 1995. Good access to food in other parts of the porpoises' distribution range and an aversive reaction to the ensonification could have caused their displacement in the fishing area.A displacement effect by pingers is likely to be more prominent in coastal waters where access to bodies of water is limited and the consequence may be serious if the area is critical to the survival of the porpoise population.

Characterizing catch variability in a multispecies fishery: implications for fishery management

Exploiting several fish species simultaneously reduces variability in daily catches. The reduction depends on the number of species, the catch-frequency distributions of individual species, and the level of co-occurrence of species in the catch. We explore theoretically the reduction of variability (coefficient of variation; CV) in the total catch by combining the distributions of daily catches of individual fish species, including zero catches, into a total catch frequency distribution. Theoretical findings are tested with an example from a stationary lift-net fishery for schooling small pelagic species around Ambon Island in the Central Moluccas, Indonesia. This fishery catches over 30 species, all with high daily variability (CV = 2.2–13.4). The reduction of variability in the total catch (CV = 1.7) is a result of the dominance and independent occurrence of the three main species. We conclude that in this fishery the information value of the total catch as an indicator of the catches of the individual species is low.