Artykuły w czasopismach: „Fishery Biology”

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HEDGECOCK, D. "Fishery Biology: Population Genetics and Fishery Management." Science 237, nr 4819 (4.09.1987): 1236. http://dx.doi.org/10.1126/science.237.4819.1236.

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Zambrano, Alan, María F. Laguna, Marcelo N. Kuperman, Pedro Laterra, Jorge A. Monjeau i Laura Nahuelhual. "A tragedy of the commons case study: modeling the fishers king crab system in Southern Chile". PeerJ 11 (14.03.2023): e14906. http://dx.doi.org/10.7717/peerj.14906.

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Illegal fishing in small-scale fisheries is a contentious issue and resists a straightforward interpretation. Particularly, there is little knowledge regarding cooperative interactions between legal and illegal fishers and the potential effects on fisheries arising from these interactions. Taking the Chilean king crab (Lithodes santolla; common name centolla) fishery as a case study, our goal is twofold: (i) to model the effect of illegal-legal fishers’ interactions on the fishery and (ii) analyze how management and social behavior affect fishery’s outcomes. We framed the analysis of this problem within game theory combined with network theory to represent the architecture of competitive interactions. The fishers’ system was set to include registered (legal) fishers and unregistered (illegal) fishers. In the presence of unregistered fishers, legal fishers may decide to cooperate (ignoring the presence of illegal fishers) or defect, which involves becoming a “super fisher” and whitewashing the captures of illegal fishers for a gain. The utility of both players, standard fisher and super fisher depend on the strategy chosen by each of them, as well as on the presence of illegal fishers. The nodes of the network represent the legal fishers (both standard and super fishers) and the links between nodes indicate that these fishers compete for the resource, assumed to be finite and evenly distributed across space. The decision to change (or not) the adopted strategy is modeled considering that fishers are subjected to variable levels of temptation to whitewash the illegal capture and to social pressure to stop doing so. To represent the vital dynamics of the king crab, we propose a model that includes the Allee effect and a term accounting for the crab extraction. We found that the super fisher strategy leads to the decrease of the king crab population under a critical threshold as postulated in the tragedy of the commons hypothesis when there are: (i) high net extraction rates of the network composed of non-competing standard fishers, (ii) high values of the extent of the fishing season, and (iii) high density of illegal fishers. The results suggest that even in the presence of super fishers and illegal fishers, the choice of properly distributed fishing/closure cycles or setting an extraction limit per vessel can prevent the king crab population from falling below a critical threshold. This finding, although controversial, reflects the reality of this fishery that, for decades, has operated under a dynamic in which whitewashing and super fishers have become well established within the system.

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Jensen, A. C., J. Humphreys, R. W. G. Caldow, C. Grisley i P. E. J. Dyrynda. "Naturalization of the Manila clam (Tapes philippinarum), an alien species, and establishment of a clam fishery within Poole Harbour, Dorset". Journal of the Marine Biological Association of the United Kingdom 84, nr 5 (październik 2004): 1069–73. http://dx.doi.org/10.1017/s0025315404010446h.

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The first known occurrence of a naturalized population of Manila clam (Tapes philippinarum) in UK waters is reported. Introduced into Poole Harbour for aquaculture in 1988; by 1994 local fishermen and wading birds began to exploit this northernmost naturalized population in Europe. The licensed fishery currently supports 31 local fishers, landing approximately 250 tn. of clams in 2002. The current distribution of the clam in Poole Harbour, the biology of this naturalized population and the ecological impact of its introduction and fishery, is described.

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Suresh, Vettath R., Benoy K. Biswas, Gobi K. Vinci, Krishna Mitra i Ardhendu Mukherjee. "Biology and fishery of barred spiny eel, Macrognathus pancalus Hamilton". Acta Ichthyologica et Piscatoria 36, nr 1 (30.06.2006): 31–37. http://dx.doi.org/10.3750/aip2006.36.1.05.

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Kawaguchi, So, i Stephen Nicol. "Learning about Antarctic krill from the fishery". Antarctic Science 19, nr 2 (22.05.2007): 219–30. http://dx.doi.org/10.1017/s0954102007000296.

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AbstractAntarctic krill has been studied for many decades, but we are still long way from understanding their biology to be able to make reliable predictions about the reaction of their populations to environmental change. This is partly due to certain difficulties in relation to logistics, operations and survey design associated with scientific surveys that have been obstacles for us to better understand krill biology. The krill fishery is the largest fishery in the Southern Ocean, continuously operating since early 1970s. Recent studies revealed its potential to be used as a unique source for scientific discussions to understand krill biology. In this paper, after a brief overview of krill fishery operation and krill biology, we examine how current data collection through the fishery operation could contribute to a greater understanding of krill biology, and then suggest future priorities for fisheries-related research in relation to recent changes in the Southern Ocean environment.

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Simpfendorfer, Colin, i Kevin Donohue. "Keeping the fish in ‘fish and chips’: research and management of the Western Australian shark fishery". Marine and Freshwater Research 49, nr 7 (1998): 593. http://dx.doi.org/10.1071/mf97043.

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The shark fishery in the southern half of Western Australia fishery began in 1941 and developed slowly until the mid 1970s when the fishery began to expand rapidly. A management plan incorporating limited entry, gear specifications and effort controls was introduced in 1988 in response to concerns about the status of the stocks. Research has focused on the assessment of stocks, and has involved the collection of catch-and-effort data since 1975, and tactical research projects to gather data on biology; this has allowed the implementation of stock assessment, modelling and forecasting techniques. The fishing industry is involved in the development of the research projects and in the decision-making process of management. This, together with regular reporting of research results, assists in maintaining industry support and acceptance of results. A potential disadvantage of the involvement of industry is the delay in implementation that may be caused by the complexity of the system of consultation or by the conflict between regulation of the fishery and the present livelihood of fishers. However, this is minimized by the creation of clear quantitative targets for management.

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Amin, Muhammad, Mohammad Shoaib, Ghulam Nabi, Naveed Ahmed i Muhammad Kifayatullah. "A Comprehensive Review on Fishery Biology of Catfishes". Journal of Biology and Life Science 7, nr 1 (13.10.2015): 1. http://dx.doi.org/10.5296/jbls.v7i1.8421.

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Cat fish exploit a large diversity of both plant and animal protein, and adapt harsh environmental conditions as they have the ability to take atmospheric oxygen. Marine catfish tolerate a broad range of salinities between Open Ocean and fresh water. The entire catfishes have soft as well as scaleless body, are greatly appreciated by consumers and maintain healthy in both fresh and dried condition. In this review article various aspects of cat fish has been discussed.

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Boyle, Peter R., i Graham J. Pierce. "Fishery biology of northeast Atlantic squid: an overview". Fisheries Research 21, nr 1-2 (grudzień 1994): 1–15. http://dx.doi.org/10.1016/0165-7836(94)90093-0.

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Binkowski, Fred P., Konrad Dabrowski i Alexis Champiqneulle. "Advances in Fishery Biology: Biology, Exploitation. Rearing and Propagation of Coregonid Fishes". Copeia 1988, nr 2 (18.05.1988): 515. http://dx.doi.org/10.2307/1445907.

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Kennedy, James, Caroline M. F. Durif, Ann-Britt Florin, Alain Fréchet, Johanne Gauthier, Karin Hüssy, Sigurður Þór Jónsson, Halldór Gunnar Ólafsson, Søren Post i Rasmus B. Hedeholm. "A brief history of lumpfishing, assessment, and management across the North Atlantic". ICES Journal of Marine Science 76, nr 1 (16.10.2018): 181–91. http://dx.doi.org/10.1093/icesjms/fsy146.

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Abstract This report documents the fishery, assessment, and management of lumpfish (Cyclopterus lumpus) across its distribution range. Targeting lumpfish for their roe on a large scale began in the 1950s in Iceland and Norway and then in Canada in the 1970s and Greenland in the 1990s. When the fishery began, there were few regulations, but limits on vessel size, mesh size, number of nets, and length of the fishing season were gradually implemented over time. Worldwide landings have varied from ca. 2000 to 8000 tonnes of roe between 1977 and 2016. Iceland and Canada accounted for >80% of the landings until 2000. After 2013, Greenland and Iceland accounted for >94%. All countries except Iceland show a decreasing trend in the number of boats participating in the fishery, which is related to several factors: the monetary value of the roe, changes in the abundance of lumpfish, and increasing age of artisanal fishers. Each country has a different combination of data available for assessment from basic landings and fishing effort data to more detailed fishery independent survey indices of abundance. The management of total catch also differs, with an effort-controlled fishery in Iceland and Canada, a total allowable catch (TAC) per boat in Norway, and TAC per area in Greenland. Population abundance is above management targets in Iceland and Norway, but the status is less clear in Greenland and around Denmark/Sweden and appears to be depleted around Canada. Certification by the Marine Stewardship Council was instrumental in the adoption of a management plan in Greenland; however, benefits to the fishers remain unclear. Aspects surrounding the biology of lumpfish, which is poorly understood and requires investigation, include growth rate, natural mortality, and population differentiation. In addition, there is concern about the potential impacts that the recent escalation in production of lumpfish for use as cleaner fish in the aquaculture industry could have on the wild population.

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Hossain, M. Shahadat, S. M. Sharifuzzaman, Muhammad Abdur Rouf, Robert S. Pomeroy, Md Delwer Hossain, Sayedur R. Chowdhury i Sheikh AftabUddin. "Tropical hilsa shad (Tenualosa ilisha): Biology, fishery and management". Fish and Fisheries 20, nr 1 (24.09.2018): 44–65. http://dx.doi.org/10.1111/faf.12323.

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Harris, David, Danielle Johnston, Errol Sporer, Mervi Kangas, Nieves Felipe i Nick Caputi. "Biology and management of a multi-sector blue swimmer crab fishery in a subtropical embayment - Shark Bay, Western Australia". Marine and Freshwater Research 63, nr 11 (2012): 1165. http://dx.doi.org/10.1071/mf12038.

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Stock assessments to support sustainable management in data-limited fisheries present a challenge to fisheries scientists and managers. This is the case with the Shark Bay Crab Fishery, which has expanded rapidly in the past 10 years, to become Australia’s highest-producing blue swimmer crab fishery. The resource is harvested commercially by two sectors, the Shark Bay crab trap and trawl fisheries (combined catch of ~800 t), as well as supporting a small but important recreational fishery. Commercial catch and effort data have been collected for the fishery since the early 1980s, commercial trap-monitoring data since 1999, and fishery-independent trawl-survey data since 2001. There is conflicting evidence on the impact that significant increases in catch and effort over the past decade has made on this fishery, such as legal catch rates remaining relatively constant, but declines occurring in the abundance of large crabs. There has also been concern over the level of latent effort in the fishery, with the trap sector currently operating at 70–80% of its potential effort and the capacity for further increases in crab landings by the trawl fleet. Since July 2011, the relative abundance of all size classes of crabs declined significantly. The reasons for this unexpected decline are yet to be understood, but are likely to be linked to adverse environmental extremes (flooding and very warm water temperatures) during the summer of 2010–2011, associated with a very strong La Niňa event. Preliminary assessment indicated that the spawning stock that led to the low recruitment was within historic ranges. The current challenge for the research and management of this fishery is to clarify the causes for this recent decline, and establish suitable biological indicators that will determine the appropriate level of catch and harvest strategy to ensure the future sustainability of the stock.

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Taylor, Brett M., i Eric Cruz. "Age-based and reproductive biology of the Pacific Longnose Parrotfish Hipposcarus longiceps from Guam". PeerJ 5 (29.11.2017): e4079. http://dx.doi.org/10.7717/peerj.4079.

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The Pacific longnose parrotfish Hipposcarus longiceps (Valenciennes 1840) represents a prime fishery resource throughout much of the tropical Pacific. In this study, we sampled the species from the Guam commercial fishery market across five consecutive years to characterize reproductive and age-based demographic information imperative for informed fishery management. Compared with other parrotfishes, this species was found to be large-bodied, but has only a moderate life span of 10 + years. Hipposcarus longiceps was confirmed as a diandric protogynous hermaphrodite with highly sex-specific growth patterns and an overall mean asymptotic length of 434 mm fork length (FL). Females were estimated to reach median maturity at 329 mm FL (2.4 years) and have a median length at female-to-male sex change of 401 mm FL. Life-history trait values derived here were used to update previous models relating life history and vulnerability to overexploitation. We found that enhancement of just one species’ trait values improved model fits considerably, which strengthens the conclusion that life-history traits are a strong determinant of species’ vulnerability in the parrotfishes. This information is an imperative complement to other data sources facilitating formal stock assessment of a key fishery target.

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Smirnov, Andrey, Yuri Omelchenko, Yuri Semenov i Julia Elatinceva. "Features of Pacific herring (Clupea pallasii) fishery in January-April 2021 in the northern part of the Sea of Okhotsk". Fisheries 2021, nr 4 (28.07.2021): 38–43. http://dx.doi.org/10.37663/0131-6184-2021-4-38-43.

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Based on the materials collected in 2021, the catch, some features of herring biology and behavior inhabiting the northern part of the Sea of Okhotsk are considered. The problems encountered in the herring fishery are shown, and measures to optimize the fishery are proposed.

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Emmerson, Jack A., Jodie A. Haig, Georgia Robson, Hilmar Hinz, Lewis Le Vay i Michel J. Kaiser. "Size-selective fishing of Palaemon serratus (Decapoda, Palaemonidae) in Wales, UK: implications of sexual dimorphism and reproductive biology for fisheries management and conservation". Journal of the Marine Biological Association of the United Kingdom 97, nr 6 (19.05.2016): 1223–32. http://dx.doi.org/10.1017/s0025315416000722.

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The common prawn (Palaemon serratus) supports a small-scale but economically important seasonal static-gear fishery in Cardigan Bay, Wales (UK). Due to a lack of statutory obligation and scientific evidence, the fishery has operated to date without any harvest-control rules that afford protection from overfishing. In response to fluctuations in landings and in pursuit of increased economic returns for their catch, some members of the fishing industry have adopted a size-selective harvesting regime, which we evaluate here using baseline data. Monthly samples were obtained from fishers operating out of five ports between October 2013 and May 2015 (N = 4233). All prawn were sexed, weighed and measured, whilst the fecundity of females was estimated for 273 (44%) individuals. Peak spawning occurred during the spring and females were estimated to undergo a ‘puberty moult’ at a carapace length (CL) of 7.7 mm, whilst functional maturity was estimated at a CL of 9.9 mm. The sampled population exhibited sexual dimorphism, with females attaining a greater size than males. The current harvesting regime results in a sex bias in landings as even large mature males remained under the recruitment size to the fishery, unlike the large mature females. The temporal trend in sex-ratio indicates a continual decrease in the catchability of female prawn through the fishing season; however, whether this is caused by depletion via fishing mortality or migratory behaviour is yet to be resolved. Here, we provide a comprehensive baseline evaluation of population biology and discuss the implications of our findings for fisheries management.

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Datsky, A. V., A. Yu Sheybak i N. P. Antonov. "Walleye pollock of the Bering Sea: features of distribution and biology, stocks, fishery". Trudy VNIRO 189 (9.12.2022): 73–94. http://dx.doi.org/10.36038/2307-3497-2022-189-73-94.

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The purpose of the work: to identify the features of the distribution and biology of walleye pollock Gadus chalcogrammus, as well as to provide information on the reserves and development of its resources in the Bering Sea.Methods used: to achieve the goal, data on distribution, biology, biomass and fishery of walleye pollock were analyzed.Novelty: elements of novelty are generalized modern materials on the distribution, biology, stocks and fishery of walleye pollock.Practical significance: at the present stage, the East Bering Sea and northwestern pollock populations are at the average long-term level of biomass, their annual changes largely depend on the background conditions of the natural environment and the development of the food supply, which determine the scale of fish migration from the southeastern part of the Bering Sea to the northwestern and back. In the West Bering Sea walleye pollock, there is a trend towards a gradual recovery of stocks after a period of minimum values in the late 1990s — e arly 2000s. In general, the current state of walleye pollock stocks in the Bering Sea is characterized as stable, which maintains the fishery at a relatively high level. The results obtained in this work on the characteristics of the distribution and biology of walleye pollock, the state of its stocks and fishing will improve the efficiency of using the raw material base of marine fish in the Bering Sea.

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Orsi Relini, L., A. Mannini, F. Fiorentino, G. Palandri i G. Relini. "Biology and fishery of Eledone cirrhosa in the Ligurian Sea". Fisheries Research 78, nr 1 (kwiecień 2006): 72–88. http://dx.doi.org/10.1016/j.fishres.2005.12.008.

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Gopalakrishna Pillai, N., i Palanisamy Satheeshkumar. "Biology, fishery, conservation and management of Indian Ocean tuna fisheries". Ocean Science Journal 47, nr 4 (grudzień 2012): 411–33. http://dx.doi.org/10.1007/s12601-012-0038-y.

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Bailey, R. S., D. W. McKay, J. A. Morrison i M. Walsh. "The biology and management of herring and other pelagic fish stocks in the Firth of Clyde". Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences 90 (1986): 407–22. http://dx.doi.org/10.1017/s0269727000005121.

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SynopsisThe herring population inhabiting the Firth of Clyde has supported an important fishery for hundreds of years. The basis for this fishery was until recently a stock of spring-spawning herring which spawn on Ballantrae Bank in the period February-April and which was investigated intensively by means of larval surveys from 1958 to 1979, when it had decreased to a very low level. In the late 1960s there was evidence of a change in the composition of the landings and during the 1970s and in the present decade the majority of fish caught have been of autumn-spawned origin. There is no evidence of significant autumn-spawning in the Firth of Clyde and autumn-spawning herring in advanced stages of maturation appear to leave the Clyde, returning by the time the fishery opens the following spring.The spawning origin of autumn-spawned herring in the Clyde has been investigated by tagging experiments, and recaptures have been made in the Irish Sea, off the northwest Irish coast and further north along the west coast of Scotland. However the spawning area of the majority of the fish is unknown.The herring fisheries in the Clyde, originally carried out by ring-net and anchored drift-net but now mainly by pair-trawl, have been managed by closed seasons and in the past few years by total allowable catch regulations under the control of the European Community.There is also a population of sprats in the Firth of Clyde which supports a small fishery and spawning of this species takes place earlier in the Clyde than elsewhere around Scotland. Mackerel also make annual incursions into the Clyde and support a small summer fishery. Factors affecting the abundance of pelagic fish species in the Clyde are discussed.

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Nilsson, Jessica A., Craig R. Johnson, Elizabeth A. Fulton i Marcus Haward. "Fisheries sustainability relies on biological understanding, evidence-based management, and conducive industry conditions". ICES Journal of Marine Science 76, nr 6 (21.04.2019): 1436–52. http://dx.doi.org/10.1093/icesjms/fsz065.

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Abstract This article recognizes that the impacts and effects of fishing are key to marine ecosystem management and explores the relationship between fisheries exploitation and sustainable harvests, and the collapse and depletion of stocks. A survey of 21 fisheries from around the world assessed key biological, environmental, social, economic, industry, governance, and management variables and associated criteria that potentially affect stock abundance. We developed 51 criteria as potential contributing factors underpinning three main fishery management outcomes: a sustainable fishery, a depleted fishery, or a collapsed fishery. The criteria that scored highest for the 15 sustainable fisheries in the analysis were associated with the broad groupings of biology (characteristics of the species and stock), management (legal and policy frameworks, tools and decision systems), and industry (economic performance and value). This analysis showed that while a fishery might have a high score for management, sustainability is likely to be difficult to achieve without a medium or high score for biological knowledge.

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Neilson, John D., John F. Kearney, Peter Perley i Harry Sampson. "Reproductive Biology of Atlantic Halibut (Hippoglossus hippoglossus) in Canadian Waters". Canadian Journal of Fisheries and Aquatic Sciences 50, nr 3 (1.03.1993): 551–63. http://dx.doi.org/10.1139/f93-064.

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Through examination of commercial fishery samples, surveys conducted from research vessels, and fishery observer programs, the reproductive biology of Atlantic halibut (Hippoglossus hippoglossus) in the Canadian North Atlantic is described. Using data derived from conventional techniques including histology and visual assessment of maturity, and a more novel approach using image analyses equipment, halibut were found to be group-synchronous spawners whose spawning activity peaks in the November–December period, considerably earlier than was previously thought. Our analyses also allowed us to comment on the life history of Atlantic halibut in Canadian waters. The comparative absence of spawners in the continental shelf/slope areas may mean that halibut spawn in comparatively deep water, consistent with the habits of the Pacific member of the genus, H. stenolepis. Immature fish typically occurred on the southwestern Scotian Shelf but rarely off Newfoundland, supporting the view that the former area is an important rearing area for immature halibut.

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Raghavan, Rajeev, Siby Philip, Anvar Ali, Unmesh Katwate i Neelesh Dahanukar. "Fishery, biology, aquaculture and conservation of the threatened Asian Sun catfish". Reviews in Fish Biology and Fisheries 26, nr 2 (2.02.2016): 169–80. http://dx.doi.org/10.1007/s11160-016-9418-1.

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Blaber, Stephen J. M. "The mackerel, its biology, assessment and the management of a fishery". Fisheries Research 8, nr 3 (styczeń 1990): 294–95. http://dx.doi.org/10.1016/0165-7836(90)90030-y.

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Gaspare, Lydia, i Ian Bryceson. "Reproductive Biology and Fishery-Related Characteristics of the Malabar Grouper (Epinephelus malabaricus) Caught in the Coastal Waters of Mafia Island, Tanzania". Journal of Marine Biology 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/786589.

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The reproductive biology and fishery-related characteristics of the Malabar grouper (Epinephelus malabaricus) (Bloch and Schneider, 1801) specimens were investigated. The size of females ranged from 25 to 113 cm total length (LT), with 50% sexually mature at 79 cmLT, and the males (97 cm to 114 cmLT) were larger than the females. Due to the sex ratios and size distribution of the sample, it appeared that the groupers change sex between 97 and 113 cmLT. However, the gonadal histology data lacked specimens in the transitional stage. The spawning peak occurred in November, as defined by the presence of ripe females, and the spawning season lasted from September to February. The size of the fish correlated positively with the water depth at capture, which is also related to oxygen levels in deep water being more favourable for larger fish. Larger specimens (>100 cmLT) were targeted by fishers between December and February, when the northeast monsoon coincides with calmer weather and the spawning season. Fishers were interviewed, and observations were made on fishing gear, vessels, and grounds. There was no indication that small-scale fishers targeted spawning aggregations; therefore, fisheries independent research is recommended in order to verify the time, location, and behaviour of the spawning of Malabar groupers for management and conservation purposes.

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Williams, A. J., C. R. Davies i B. D. Mapstone. "Regional patterns in reproductive biology of Lethrinus miniatus on the Great Barrier Reef". Marine and Freshwater Research 57, nr 4 (2006): 403. http://dx.doi.org/10.1071/mf05127.

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Uniformity in fish population biology is a common assumption in many fishery assessments and management arrangements. Although spatial patterns in population biology are often unknown, ignorance of significant variation within a fished stock has profound implications for fishery assessments and management. In the current paper, the reproductive biology of an exploited reef fish, Lethrinus miniatus, was examined for populations in the northern and southern regions of the Great Barrier Reef (GBR). Significant regional variation was observed in some reproductive parameters, but not others. In the northern region, the proportion of spawning females observed during the spawning season was significantly greater and the size at sex change significantly smaller than in the southern region. However, the spawning season, age at sex change and sex ratios did not differ significantly between the northern and southern regions. Size and age at maturity could not be estimated from either of these regions, but an estimate was obtained from the Capricorn–Bunker region at the southern tip of the GBR. The observed regional patterns in reproductive biology of L. miniatus populations have important implications for specific management arrangements such as size limits and seasonal closures, and for fisheries management in general.

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Bailey, N., F. G. Howard i C. J. Chapman. "Clyde Nephrops: biology and fisheries". Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences 90 (1986): 501–18. http://dx.doi.org/10.1017/s0269727000005194.

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SynopsisThe fishery for Norway lobsters Nephrops norvegicus began in the 1950s and has since become one of the most valuable assets of the Clyde Sea Area. Landings of Nephrops reached a peak of 26001 in 1972. Following a decline in landings up to 1975 there has been a further increase to over 45001 in 1983, valued at £4–5 million. Most of the landings are made by inshore trawlers working from Ayr, Troon, Girvan, Largs, Campbeltown and Tarbert. Recently a small creel fishery has developed in some sea lochs. The abundance of the stock appears to have been maintained; landings per unit of fishing effort have fluctuated without any obvious trend.Since September, 1979. several aspects of the biology of Nephrops have been studied in an area south of the Little Cumbrae at the north end of the east Arran Basin. Data are presented on the density, size composition, growth rate, reproductive biology and feeding of Nephrops in this area. The results are compared with those obtained for other Nephrops populations, revealing some unusual features of Clyde Nephrops. In the Clyde, densities were lower than in a number of other areas, while growth rate was much higher and animals grew to larger sizes. Sexual maturity was attained at a larger size in Clyde Nephrops and studies of ovary development revealed that considerable numbers of large females did not reproduce annually, in contrast to some other areas. Recent observations suggest that the biological characteristics of Nephrops populations in an area may be influenced by features of the local physical environment such as the particle size distribution and organic carbon content of the sediment. Differences between Clyde Nephrops and those from other areas are discussed in relation to this.

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Feekings, Jordan, Valerio Bartolino, Niels Madsen i Tom Catchpole. "Fishery Discards: Factors Affecting Their Variability within a Demersal Trawl Fishery". PLoS ONE 7, nr 4 (30.04.2012): e36409. http://dx.doi.org/10.1371/journal.pone.0036409.

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Herrera, Marcela, Tayler M. Clarke, Beatriz Naranjo-Elizondo, Mario Espinoza i Ingo S. Wehrtmann. "Size at maturity of the Pacific bearded brotula (Ophidiidae: Brotula clarkae): a commercially exploited species in the Pacific of Costa Rica". Latin American Journal of Aquatic Research 44, nr 3 (23.02.2017): 657–61. http://dx.doi.org/10.3856/vol44-issue3-fulltext-25.

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The deep-water shrimp fishery is of great commercial importance along the Pacific coast of Latin America. In Costa Rica, shrimp resources have declined considerably over the last decade. Therefore, fisheries have shifted towards teleost species such as the Pacific bearded brotula Brotula clarkae. Little is known about the biology and life history of this species, which is becoming increasingly valuable to artisanal and semiindustrial fishers in Costa Rica. A sample of 348 B. clarkae was obtained along the Pacific coast of Costa Rica between March 2011 and July 2012 to obtain baseline information of this species. The results revealed that the size at sexual maturity of B. clarkae was 71.9 cm TL, considerably higher than previously reported for South American populations. Since the size at maturity may vary between populations in different geographic locations, detailed information of the reproductive biology of widely distributed species such as B. clarkae is critical for developing effective management approaches.

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WANG, Kai, Shou-yu ZHANG, Zheng-hua WANG, Jing ZHAO i Min XU. "A preliminary study on fishery biology of Johnius belangerii off Ma'an Archipelago". Journal of Fisheries of China 36, nr 2 (2012): 228. http://dx.doi.org/10.3724/sp.j.1231.2012.27691.

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Oliveira, Cicero Diogo, Rosangela Lessa, Zafira Almeida i Francisco Marcante Santana. "Biology and fishery of Acoupa Weakfish Cynoscion acoupa (Lacepède, 1801): a review". Neotropical Biology and Conservation 15, nr 3 (14.08.2020): 333–49. http://dx.doi.org/10.3897/neotropical.15.e55563.

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The present study describes the fishery and biology of Acoupa Weakfish Cynoscion acoupa, an important fishery resource in South America. We found and analyzed 31 articles and 10 publications about the species. Cynoscion acoupa is an estuarine marine species, which has a feeding habit with preference for fish and crustaceans. Its spawning occurs during two periods of the year and the size at maturity of females is 40 to 50 cm, while males mature earlier, with 38–40 cm. Their growth is considered slow to moderate, with growth coefficient k ranging from 0.13 to 0.28, and the species can reach up to 15 years of age. C. acoupa is target of commercial and recreational fisheries in estuarine and marine coastal environments, mainly in the northern region of South America. The fisheries occur throughout the year, with different fishing gear, being more frequent with gillnets. In addition, fishing is more frequent on juveniles, which may compromise the stock. This species is categorized as of Least Concern by the International Union for Conservation of Nature, although it has a high degree of vulnerability to fishing, which, combined with overexploitation, shows that C. acoupa should be listed as under threat of extinction to some degree. The lack of studies on the species makes it difficult to establish management measures. Therefore, further studies should be prioritized, especially on reproductive biology, growth and fishing exploitation.

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Chen, Xinjun, Jianghua Li, Bilin Liu, Gang Li i Huajie Lu. "Fishery biology of jumbo flying squid Dosidicus gigas off Costa Rica Dome". Journal of Ocean University of China 13, nr 3 (10.05.2014): 485–90. http://dx.doi.org/10.1007/s11802-014-2165-9.

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E. Philips, Amal. "Fishery biology of Terapon puta (Cuvier, 1829) from east Egyptian Mediterranean waters". Egyptian Journal of Aquatic Biology and Fisheries 23, nr 1 (5.02.2019): 197–203. http://dx.doi.org/10.21608/ejabf.2019.26580.

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Xinjun, Chen, Liu Bilin, Tian Siquan, Qian Weiguo i Zhao Xiaohu. "Fishery biology of purpleback squid, Sthenoteuthis oualaniensis, in the northwest Indian Ocean". Fisheries Research 83, nr 1 (styczeń 2007): 98–104. http://dx.doi.org/10.1016/j.fishres.2006.09.005.

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García-Flórez, L., i P. Fernández-Rueda. "Reproductive biology of spider crab females (Maja brachydactyla) off the coast of Asturias (north-west Spain)". Journal of the Marine Biological Association of the United Kingdom 80, nr 6 (grudzień 2000): 1071–76. http://dx.doi.org/10.1017/s0025315400003131.

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The first results of the females reproductive cycle of Maja brachydactyla (Braquiura: Majidae) off the coast of Asturias (north-west Spain) are presented. Mean size of mature females was 133·4 mm (N=1022) in 1997 and 125·0 mm (N=942) in 1998. Only one cohort is exploited each fishing season. This cohort passed through the terminal moult the year before and recruited in to the fishery beginning in June. The breeding cycle off the coast of Asturias begins in December and ends in November the following year. Results from this study indicate that females produce 3–4 broods per year in these waters, which is the highest reported number for M. brachydactyla. The results are discussed in terms of their importance for management of the fishery.

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Datsky, A. V., A. Yu Sheybak i V. G. Chikilev. "Chukchi Sea — new walleye pollock fishing area". Trudy VNIRO 189 (9.12.2022): 162–79. http://dx.doi.org/10.36038/2307-3497-2022-189-162-179.

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The purpose: to identification of the features of the distribution and biology of walleye pollock Gadus chalcogrammus, as well as the presentation of information on the stocks of the species and the initial stage of development of its resources in the western part of the Chukchi Sea.Methods used: to achieve this goal, we used materials from nine integrated trawl surveys carried out in 1995– 2020 on research vessels, as well as coastal studies on the Arctic coast of the Chukotka Autonomous Okrug, which analyzed data on the distribution, biology, biomass and fishery of walleye pollock.Novelty: elements of novelty are generalized modern materials on the distribution, biology and for the first time organized pollock fishery.Practical significance: the Chukchi Sea can be attributed to the most favorable areas for studying the variability of the organization of Arctic ecosystems, due to the instability of climatic conditions on Earth during the period of warming. The obtained results of studies on the distribution, biology, stocks and fishery of such a mass indicator species as walleye pollock will increase the efficiency of using the raw material base of marine fish in this reservoir.

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Millar, Colin P., Ernesto Jardim, Finlay Scott, Giacomo Chato Osio, Iago Mosqueira i Nekane Alzorriz. "Model averaging to streamline the stock assessment process". ICES Journal of Marine Science 72, nr 1 (1.04.2014): 93–98. http://dx.doi.org/10.1093/icesjms/fsu043.

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Abstract The current fish stock assessment process in Europe can be very resource- and time-intensive. The scientists involved require a very particular set of skills, acquired over their career, drawing from biology, ecology, statistics, mathematical modelling, oceanography, fishery policy, and computing. There is a particular focus on producing a single “best” stock assessment model, but as fishery science advances, there are clear needs to address a range of hypotheses and uncertainties, from large-scale issues such as climate change to specific ones, such as high observation error on young hake. Key to our discussion is the use of the assessment for all frameworks to translate hypotheses into models. We propose a change to the current stock assessment procedure, driven by the use of model averaging to address a range of plausible hypotheses, where increased collaboration between the varied disciplines within fishery science will result in more robust advice.

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Welcomme, Robin L., Ian G. Cowx, David Coates, Christophe Béné, Simon Funge-Smith, Ashley Halls i Kai Lorenzen. "Inland capture fisheries". Philosophical Transactions of the Royal Society B: Biological Sciences 365, nr 1554 (27.09.2010): 2881–96. http://dx.doi.org/10.1098/rstb.2010.0168.

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The reported annual yield from inland capture fisheries in 2008 was over 10 million tonnes, although real catches are probably considerably higher than this. Inland fisheries are extremely complex, and in many cases poorly understood. The numerous water bodies and small rivers are inhabited by a wide range of species and several types of fisher community with diversified livelihood strategies for whom inland fisheries are extremely important. Many drivers affect the fisheries, including internal fisheries management practices. There are also many drivers from outside the fishery that influence the state and functioning of the environment as well as the social and economic framework within which the fishery is pursued. The drivers affecting the various types of inland water, rivers, lakes, reservoirs and wetlands may differ, particularly with regard to ecosystem function. Many of these depend on land-use practices and demand for water which conflict with the sustainability of the fishery. Climate change is also exacerbating many of these factors. The future of inland fisheries varies between continents. In Asia and Africa the resources are very intensely exploited and there is probably little room for expansion; it is here that resources are most at risk. Inland fisheries are less heavily exploited in South and Central America, and in the North and South temperate zones inland fisheries are mostly oriented to recreation rather than food production.

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McAuley, R. B., C. A. Simpfendorfer, G. A. Hyndes i R. C. J. Lenanton. "Distribution and reproductive biology of the sandbar shark, Carcharhinus plumbeus (Nardo), in Western Australian waters". Marine and Freshwater Research 58, nr 1 (2007): 116. http://dx.doi.org/10.1071/mf05234.

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In total, 7497 sandbar sharks, Carcharhinus plumbeus (Nardo, 1827), were collected between May 2000 and June 2003 from commercial fishers and during fishery-independent research cruises in coastal Western Australian waters. Maximum observed lengths were 165 and 166 cm fork length (FL) for males and females respectively. The lengths at which 50% of sharks were mature were 126.9 and 135.9 cm FL for males and females respectively. Juvenile sharks tended to occur in temperate waters, whereas mature-sized sharks predominantly occurred in tropical waters. Unlike other regions, juveniles were found in offshore continental shelf waters rather than in shallow waters of estuaries and marine embayments. Results indicated a biennial reproductive periodicity. Mating occurred during summer and autumn, and parturition took place after a 12-month gestation. Pups were born at 40 to 45 cm FL throughout most of the species’ Western Australian range. The majority of neonates were caught at temperate latitudes. Litter sizes varied between 4 and 10, with a mean of 6.5. There was a weak but statistically significant increase in litter size with maternal length. Mean embryonic sex ratio of females to males differed significantly from a one-to-one ratio.

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Montaño, M. N. E., C. L. Villanoy, J. D. L. Deauna i A. A. Pedrosa. "Science Interventions for Sustainable Marine Products Production: The Case of Sardines and Seaweeds". Transactions of the National Academy of Science and Technology 39, nr 2017 (listopad 2021): 1–15. http://dx.doi.org/10.57043/transnastphl.2017.1065.

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This paper presents two cases of scientific interventions to address pressing sustainable production of marine products in the Philippines such as the sardine fishery and seaweed production. The Philippine sardine fishery accounts for about 25% of commercial and 11% of municipal fisheries. Due to dwindling catch, the biology, ecology, fish catch and environmental factors were investigated in Northern Zamboanga Peninsula where upwelling during the northeast monsoon supports a significant sardine population. The study resulted in a resource management program that remains adaptive and spatially explicit to ensure sustainability of the sardine fishery. On the other hand, the Philippine seaweed production contributes about 50% of the annual fishery production volume, of which 70% comes mainly from carrageenophytes or carrageenan-bearing seaweeds. Production of these seaweeds made the Philippines the world’s top supplier of the raw dried seaweed for carrageenan production until 2007 after which seaweed production for the carrageenan industry placed second only to a neighboring country. Government agencies and academic institutions, thus, initiated studies to improve the productivity of this marine plant. For sustainability, tissue culture techniques were developed, and gene and seedlings banks were established in strategic parts of the country to ensure continued supply of quality seaweed seedlings to the farmers. Philippine standard specifications for raw material and carrageenan were formulated to comply with international standards. Continued science interventions to marine fishery industries are called for and should be intensified to promote further the country’s progress.

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Vilkina, O. V., i A. P. Shmigirilov. "Biology and fishery of pond smelt Hypomesus olidus in the Amur River basin". Izvestiya TINRO 200, nr 4 (23.12.2020): 856–72. http://dx.doi.org/10.26428/1606-9919-2020-200-856-872.

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In the Amur River, there are two ecological forms of pond smelt Hypomesus olidus: anadromous and freshwater. Generalized information about biology and fishery of the anadromous form of pond smelt is presented. The smelt migrate to the Amur for spawning in winter and spring, and for wintering in autumn. The most remote point of their spawning migration is Bolbinsky cliff (375 km from the mouth). The spawning herd is represented by three age groups: 2-, 3-, and 4-year-old fish; the two-year-old fish are the most numerous. The sex ratio of spawning smelt is close to 1 : 1, though females prevail slightly. Body length of the pubescent fish ranges from year to year from 7.6 to 13.2 cm, body weight — from 3.05 to 16.04 g; females are slightly larger than males. Absolute fecundity of pond smelt ranges from 0.7 to 12.4 thousand eggs, relative fecundity — from 199 to 1287 eggs/g. During migration to the spawning grounds, the smelt practically do not feed, but they go to active feeding after spawning. Pond smelt is a popular object of fishery in the Amur basin: on average 1569.2 t were caught annually in 2010–2019, during the spawning migration, mainly in the lower Amur River between Nikolayevsk-on-Amur and Bogorodskoe.

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Mallet, Alicia, Jean-Yves Jouvenel, Morgane Broyon, Nelly Pirot i Benjamin Geffroy. "Histology of Tritia mutabilis gonads: using reproductive biology to support sustainable fishery management". Aquatic Living Resources 34 (2021): 6. http://dx.doi.org/10.1051/alr/2021006.

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The mutable nassa, Tritia mutabilis, a marine gastropod that is widely exploited on the Adriatic coast is an important source of income for small-scale fishermen in the Mediterranean Sea, particularly in the Gulf of Lion. However, the lack of knowledge on the ecology and biology of this species limits our capacities to propose and produce an effective management plan. As a result, stocks are currently declining, especially in Italy. In order to optimize a management plan for this fishery, we designed a study to better characterize the reproductive biology of T. mutabilis, using gonad histology and performing a regular monitoring of population size frequency. The average shell height of individuals during the breeding period was 24 ± 2.7 mm for males and 30 ± 3.7 mm for females. The presence of small females (10 mm) and large males (32 mm) in the whole sample challenged previous assumptions regarding protandry (sex change from male to female). The size at first maturity was estimated for males and females at 17.5 mm and 24.4 mm shell height, respectively. In Italy, current management measures include a minimum conservation reference size of 20 mm in shell height. Therefore, it is likely that many individuals that did not reproduce are being caught, which could partly explain the decline observed, despite conservation measures introduced more than ten years ago. Overall, our study provides some baseline information to establish, in consultation with fishermen, management measures for this small-scale fishery in France.

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Lorenzoni, M., R. Dolciami, L. Ghetti, G. Pedicillo i A. Carosi. "Fishery biology of the goldfishCarassius auratus(Linnaeus, 1758) in Lake Trasimeno (Umbria, Italy)". Knowledge and Management of Aquatic Ecosystems, nr 396 (2010): 01. http://dx.doi.org/10.1051/kmae/20010001.

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Pajaro, Marivic G., Jessica J. Meeuwig, Brian G. Giles i Amanda C. J. Vincent. "Biology, fishery and trade of sea moths (Pisces: Pegasidae) in the central Philippines". Oryx 38, nr 4 (październik 2004): 432–38. http://dx.doi.org/10.1017/s003060530400081x.

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Sea moths (family Pegasidae) are little-studied benthic fish, found throughout the Indo-Pacific. Two species of sea moths, Pegasus volitans and Eurypegasus draconis, are caught incidentally in illegal trawl gear in the Philippines and sold into the dried fish trade. Approximately 130,000–620,000 P. volitans and 130,000 E. draconis were landed off north-western Bohol alone in 1996. An additional 43,000–62,000 sea moths (predominantly P. volitans) were caught live for the aquarium trade. Catch per unit effort for P. volitans was double that of E. draconis, probably because of its occurrence in shallower waters where fishing effort was concentrated. Sea moths may be unsuited for heavy exploitation as they occur at low densities. Moreover, a female-biased catch could lower the effective population size, given the reported monogamy amongst sea moths. No population data were available for a complete conservation assessment, although divers surveyed did report declines in their abundance.

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Rodhouse, Paul G., Claire M. Waluda, Enrique Morales-Bojórquez i Agustín Hernández-Herrera. "Fishery biology of the Humboldt squid, Dosidicus gigas, in the Eastern Pacific Ocean". Fisheries Research 79, nr 1-2 (czerwiec 2006): 13–15. http://dx.doi.org/10.1016/j.fishres.2006.02.008.

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Shalloof, Kariman, i Alaa El- Far. "Age, growth and fishery biology of cichlid spp. in Abu-Zaabal Lakes,Egypt". Egyptian Journal of Aquatic Biology and Fisheries 13, nr 2 (1.04.2009): 101–16. http://dx.doi.org/10.21608/ejabf.2009.2035.

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Merella, P., F. Alemany, A. Carbonell i A. Quetglas. "Fishery and biology of Norway lobsterNephrops norvegicus(Decapoda: Nephropidae) in Mallorca (western Mediterranean)". Journal of Natural History 32, nr 10-11 (listopad 1998): 1631–40. http://dx.doi.org/10.1080/00222939800771161.

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Smith, Theodore I. J. "The fishery, biology, and management of Atlantic sturgeon, Acipenser oxyrhynchus, in North America". Environmental Biology of Fishes 14, nr 1 (październik 1985): 61–72. http://dx.doi.org/10.1007/bf00001577.

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Liu, Bilin, Xinjun Chen, Huajie Lu, Yong Chen i Weiguo Qian. "Fishery biology of the jumbo flying squid Dosidicus gigas off the Exclusive Economic Zone of Chilean waters". Scientia Marina 74, nr 4 (1.07.2010): 687–95. http://dx.doi.org/10.3989/scimar.2010.74n4687.

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Blanco-Parra, María-Del-Pilar, J. Fernando Márquez-Farías i Felipe Galván-Magaña. "Reproductive biology of the banded guitarfish, Zapteryx exasperata, from the Gulf of California, México". Journal of the Marine Biological Association of the United Kingdom 89, nr 8 (5.08.2009): 1655–62. http://dx.doi.org/10.1017/s0025315409990348.

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The banded guitarfish, Zapteryx exasperata, is a common species in the artisanal elasmobranch fisheries in the Gulf of California. Fishery-derived specimens were examined to determine critical aspects of the reproductive biology of this poorly known group of rays. Two functional testes and ovaries were found in males and females respectively. Median size at maturity (L50%) for males was 64 cm total length (TL) and for females 69 cm TL. Average length of gravid females was 78.8±3.8 cm TL. Histological analysis showed no evidence of sperm storage in the oviducal gland. Gestation was estimated to occur over a five to six month period (February–July) and was concurrent with vitellogenesis. Mean uterine fecundity was estimated as 7 (range 2–13, SD. = 3). The sex-ratio of embryos was 1:1. The reproductive cycle for Z. exasperata from the Gulf of California was estimated to last one year with parturition, ovulation and copulation occurring during the summer months. Differences found in the reproductive cycle of Z. exasperata between the Gulf of California and the west coast of Baja California could have implications in the future management plans for this fishery in the Gulf of California.

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Bellquist, Lyall, Vienna Saccomanno, Brice X. Semmens, Mary Gleason i Jono Wilson. "The rise in climate change-induced federal fishery disasters in the United States". PeerJ 9 (22.04.2021): e11186. http://dx.doi.org/10.7717/peerj.11186.

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Commercial, recreational, and indigenous fisheries are critical to coastal economies and communities in the United States. For over three decades, the federal government has formally recognized the impact of fishery disasters via federal declarations. Despite these impacts, national syntheses of the dynamics, impacts, and causes of fishery disasters are lacking. We developed a nationwide Federal Fishery Disaster database using National Oceanic and Atmospheric Administration (NOAA) fishery disaster declarations and fishery revenue data. From 1989-2020, there were 71 federally approved fishery disasters (eleven are pending), which spanned every federal fisheries management region and coastal state in the country. To date, we estimate fishery disasters resulted in $2B (2019 USD) in Congressional allocations, and an additional, conservative estimate of $3.2B (2019 USD) in direct revenue loss. Despite this scale of impact, the disaster assistance process is largely ad hoc and lacks sufficient detail to properly assess allocation fairness and benefit. Nonetheless, fishery disasters increased in frequency over time, and the causes of disasters included a broad range of anthropogenic and environmental factors, with a recent shift to disasters now almost exclusively caused by extreme environmental events (e.g., marine heatwaves, hurricanes, and harmful algal blooms). Nationwide, 84.5% of fishery disasters were either partially or entirely attributed to extreme environmental events. As climate change drives higher rates of such extreme events, and as natural disaster assistance requests reach an all-time high, the federal system for fisheries disaster declaration and mitigation must evolve in order to effectively protect both fisheries sustainability and societal benefit.

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