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Yang, Huiping, Leslie N. Sturmer i Shirley Baker. "Molluscan Shellfish Aquaculture and Production". EDIS 2016, nr 3 (6.05.2016): 8. http://dx.doi.org/10.32473/edis-fa191-2016.
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Molluscan shellfish aquaculture provides high quality and high value seafood for human consumption, and shellfish provide environmentally beneficial ecosystem services, such as nutrient extraction and water filtration, to the environment in which they are grown. In the past five decades, global fisheries and aquaculture have grown steadily, and seafood consumption per capita has increased. Molluscan shellfish has traditionally been a major component of world aquaculture. Today, molluscs are cultured in 76 countries. This 8-page fact sheet describes molluscan shellfish aquaculture in the United States and worldwide and outlines molluscan shellfish aquaculture stages and methodologies. Written by Huiping Yang, Leslie N. Sturmer, and Shirley Baker, and published by the UF School of Forest, Fisheries, and Geomatics Sciences, January 2016. FA191/FA191: Molluscan Shellfish Aquaculture and Production (ufl.edu)
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MAGUIRE, GREG B., FRED E. WELLS i LINDSAY M. JOLL. "SYMPOSIUM ON MOLLUSCAN FISHERIES AND AQUACULTURE". Journal of Shellfish Research 25, nr 1 (kwiecień 2006): 137–39. http://dx.doi.org/10.2983/0730-8000(2006)25[137:somfaa]2.0.co;2.
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Rueda, José L., Pablo Marina, Javier Urra i Carmen Salas. "Changes in the composition and structure of a molluscan assemblage due to eelgrass loss in southern Spain (Alboran Sea)". Journal of the Marine Biological Association of the United Kingdom 89, nr 7 (2.06.2009): 1319–30. http://dx.doi.org/10.1017/s0025315409000289.
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The composition and structure of a molluscan assemblage was studied in a deep subtidal eelgrass bed located in southern Spain before and after the eelgrass decline experienced during 2005 and 2006 due to illegal trawling by fishermen. Sampling was undertaken in summer 2004 (with eelgrass) and summer 2007 (without eelgrass) in an extensive eelgrass bed located in Cañuelo Bay (12–14 m depth) and in the same area once the eelgrass bed disappeared. Eelgrass was completely absent in those samples of summer 2007 and an increase of the organic content and mud was registered in the sediment between 2004 and 2007. The density and the richness of molluscan species decreased significantly in summer 2007, especially for epifaunal gastropods associated with the leaf and sediment stratum. Some species disappeared completely in summer 2007 such as the dominant periphyton grazersJujubinus striatusandRissoaspp., the egg feederMitrella minorand the seagrass feederSmaragdia viridisas well as the infaunal bivalveSolemya togata. Other species increased their densities such as the carnivoresCylichna crosseiorC. cylindraceaas well as the bivalveNucula nitidosa. Some dominant infaunal species, such asChamelea gallina, Spisula subtruncataorTellina fabuladid not significantly change their densities. The composition and structure of the assemblages in summer 2004 and summer 2007 was significantly different according to the Bray–Curtis similarity index using qualitative and quantitative data and considering the entire assemblage (epifaunal and infaunal species) or only the infaunal species. The registered changes in the molluscan assemblage may have produced cascade effects in higher trophic levels because molluscs generally represent an important food source for some decapods and fish. Urgent conservation measures are needed for protecting the remaining fragmented eelgrass beds of southern Spain from further illegal fisheries activities and other types of human impacts (e.g. sand extraction and coastal infrastructures), because they support the most diverse faunistic communities for eelgrass beds in Europe due to their bathymetry and geographical location.
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Thain, J. E., i M. J. Waldock. "The Impact of Tributyl Tin (TBT) Antifouling Paints on Molluscan Fisheries". Water Science and Technology 18, nr 4-5 (1.04.1986): 193–202. http://dx.doi.org/10.2166/wst.1986.0195.
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Laboratory and field experiments carried out during 1982–84 confirmed that some UK estuaries contained sufficient organotin compounds to cause reduced meat yields and shell thickening in the Pacific oyster, Crassostrea gigas. Historically the European flat oyster, Ostrea edulis, has been the basis of an important fishery on the east coast of England but the population has recently declined to an all-time low. Laboratory experiments have been carried out to compare larval survival, growth of spat and the development of gametes in adult O. edulis, and the growth of spat of four other bivalve species in the presence and absence of organotin toxins. The results from these experiments are discussed in relation to the concentrations of organotin compounds in samples of water and oyster tissues, from several sites in the UK, and the reproductive behaviour of adult oysters from natural stocks in the Crouch/Roach estuary system. The data strongly suggest that TBT is at least a contributory factor and probably a major cause of the failure in recent years of O. edulis to reproduce naturally in the Crouch Estuary. The UK Government has proposed legislation to control and reduce organotin emissions into the marine environment and this is briefly outlined.
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MALAQUIAS, M. A. E., L. BENTES, K. ERZINI i T. C. BORGES. "Molluscan diversity caught by trawling fisheries: a case study in southern Portugal". Fisheries Management and Ecology 13, nr 1 (luty 2006): 39–45. http://dx.doi.org/10.1111/j.1365-2400.2006.00474.x.
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Sreekanth, G. B., P. Rivonkar, T. S. Mayekar, A. Giriyan, F. D'souza, S. Dourado, B. Ingole i E. B. Chakurkar. "Inventory of fishery resources using participatory research approach in Mandovi Estuary in Central western coast of India". Journal of Environmental Biology 42, nr 5 (27.09.2021): 1257–63. http://dx.doi.org/10.22438/jeb/42/5/mrn-1646.
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Aim: The fisheries resources of Mandovi Estuary, along the central west coast of India were analysed for taxonomic, functional, feeding and population aspects and also to record and prepare an inventory on fish and shellfish species. Methodology: Finfish and shellfish taxa were monitored for four years (2016 to 2020) through surveys in small and regional markets, fishermen surveys, fishing gear samplings, telephonic interviews and photographs. Results: A total of 318 taxa are counted comprising of 169 (53.1%) demersal, 71 (22.3%) pelagic fish, 37 (11.6%), molluscan and 41 (12.9%) crustacean species. The community was dominated by marine immigrants and the freshwater types contributed least to the composition. In the inventory, majority of the resources were of commercial value and this category contributed 70% of total documented species. Even though detailed analyses were required, nearly 2% of the fauna appeared to be endemic to the region. Further, more than 30% species listed were data deficient. Out of 318 species, 10% were unknown in the Mandovi estuary. Interpretation: This data set comprehensively documents the finfish and shellfish diversity of Mandovi estuary from 2016 to 2020. The type of fish assemblage is briefly discussed focusing on the management of these resources in the estuary.
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Spanier, Ehud, Kari L. Lavalli, Jason S. Goldstein, Johan C. Groeneveld, Gareth L. Jordaan, Clive M. Jones, Bruce F. Phillips i in. "A concise review of lobster utilization by worldwide human populations from prehistory to the modern era". ICES Journal of Marine Science 72, suppl_1 (7.05.2015): i7—i21. http://dx.doi.org/10.1093/icesjms/fsv066.
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Abstract Lobsters are important resources throughout the world's oceans, providing food security, employment, and a trading commodity. Whereas marine biologists generally focus on modern impacts of fisheries, here we explore the deep history of lobster exploitation by prehistorical humans and ancient civilizations, through the first half of the 20th century. Evidence of lobster use comprises midden remains, artwork, artefacts, writings about lobsters, and written sources describing the fishing practices of indigenous peoples. Evidence from archaeological dig sites is potentially biased because lobster shells are relatively thin and easily degraded in most midden soils; in some cases, they may have been used as fertilizer for crops instead of being dumped in middens. Lobsters were a valuable food and economic resource for early coastal peoples, and ancient Greek and Roman Mediterranean civilizations amassed considerable knowledge of their biology and fisheries. Before European contact, lobsters were utilized by indigenous societies in the Americas, southern Africa, Australia, and New Zealand at seemingly sustainable levels, even while other fish and molluscan species may have been overfished. All written records suggest that coastal lobster populations were dense, even in the presence of abundant and large groundfish predators, and that lobsters were much larger than at present. Lobsters gained a reputation as “food for the poor” in 17th and 18th century Europe and parts of North America, but became a fashionable seafood commodity during the mid-19th century. High demand led to intensified fishing effort with improved fishing gear and boats, and advances in preservation and long-distance transport. By the early 20th century, coastal stocks were overfished in many places and average lobster size was significantly reduced. With overfishing came attempts to regulate fisheries, which have varied over time and have met with limited success.
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Smolowitz, Ronald. "Sea Scallop Harvest Gear: Engineering for Sustainability". Marine Technology Society Journal 40, nr 3 (1.09.2006): 25–31. http://dx.doi.org/10.4031/002533206787353268.
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The Atlantic sea scallop is the most important molluscan shellfish species commercially harvested in the United States. The species is sought for the large, white circular adductor muscle (the 'meat') that holds the two valves of the animal together. In North America, the 'meat' is generally the only part of the scallop that is landed and eaten, although the meat only accounts for about a third of the animal's visceral weight. In 2004, U.S. landings of sea scallop meats totaled 29,374 metric tons. The value of the U.S. scallop harvest in 2004 ($321 million) was only exceeded by crabs ($447 million), shrimp ($425 million), and lobster ($344 million). Harvesting problems in the wild capture scallop fishery have a long history of being addressed with technical gear-related solutions. Recent advances include larger rings and twine tops, turtle chain mats, and changes to the drag frame. Management strategies and gear design must work together for sustainable fisheries.
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Castell, John. "Farming the waters: Bringing aquatic plant and animal species to agriculture". Canadian Journal of Animal Science 80, nr 2 (1.06.2000): 235–43. http://dx.doi.org/10.4141/a99-102.
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Aquaculture has a long history, with carp culture in Asia starting before 2000 BC and oyster culture in the Roman Empire before the time of Julius Caesar. However, it is clearly the past 40 yr that have seen the most dramatic expansion of aquaculture. The world's population now exceeds 6 billion people and is still growing at an alarming rate. The world's wild fish harvest has clearly peaked at or above the maximum sustainable yield of about 90 million t. Many fish stocks are suffering from over-fishing and there is little hope of any increase in the capture fisheries production. Though modern agricultural practices have been very efficient at increasing the per acre yields, the world is experiencing an alarmingly steady decrease in the amount of agricultural land devoted to food production. In the past 20–30 yr production of fish, molluscs, crustaceans and aquatic plants (aquaculture) has become an increasingly important means of producing food, and in some countries aquaculture production accounts for more than half of the total fishery harvest and is even as high as 90% in a few countries. I have reviewed the historical growth of aquaculture, compared the product value in various countries and reviewed aquaculture practices for a number of plant, molluscan, crustacean and fish species around the world. These culture technologies were compared and contrasted with agricultural practices. Finally, some predictions for the future of aquaculture development in Canada and the world have been made. Key words: Canadian aquaculture, history, salmon, fish farming, production statistics, fish culture technology
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Kim, Mi Ae, Kesavan Markkandan, Na-Young Han, Jong-Moon Park, Jung Sick Lee, Hookeun Lee i Young Chang Sohn. "Neural Ganglia Transcriptome and Peptidome Associated with Sexual Maturation in Female Pacific Abalone (Haliotis discus hannai)". Genes 10, nr 4 (2.04.2019): 268. http://dx.doi.org/10.3390/genes10040268.
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Genetic information of reproduction and growth is essential for sustainable molluscan fisheries and aquaculture management. However, there is limited knowledge regarding the reproductive activity of the commercially important Pacific abalone Haliotis discus hannai. We performed de novo transcriptome sequencing of the ganglia in sexually immature and mature female Pacific abalone to better understand the sexual maturation process and the underlying molecular mechanisms. Of the ~305 million high-quality clean reads, 76,684 transcripts were de novo-assembled with an average length of 741 bp, 28.54% of which were annotated and classified according to Gene Ontology terms. There were 256 differentially expressed genes between the immature and mature abalone. Tandem mass spectrometry analysis, as compared to the predicted-peptide database of abalone ganglia transcriptome unigenes, identified 42 neuropeptide precursors, including 29 validated by peptidomic analyses. Label-free quantification revealed differential occurrences of 18 neuropeptide families between immature and mature abalone, including achatin, FMRFamide, crustacean cardioactive peptide, and pedal peptide A and B that were significantly more frequent at the mature stage. These results represent the first significant contribution to both maturation-related transcriptomic and peptidomic resources of the Pacific abalone ganglia and provide insight into the roles of various neuropeptides in reproductive regulation in marine gastropods.
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Sanders, Stephanie, Gregory Herbert, Gastón Trobbiani, Nicole Seiden i Jaime Rogers. "Death Assemblages Record Significant Range Contraction in a Molluscan Species of Concern from the Eastern Gulf Of Mexico". Bulletin of the Florida Museum of Natural History 60, nr 2 (16.02.2023): 112. http://dx.doi.org/10.58782/flmnh.gxlr7897.
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Marine habitats are in decline due to increasing anthropogenic pressures, but baseline data on species distributions needed to manage and conserve populations are lacking. Incorporating death assemblages into species assessments can create a more accurate understanding of pre-anthropogenic communities than survey records alone. In this study, we conducted a live-dead analysis on mollusks from a new 2008-2018 dredge survey in the eastern Gulf of Mexico. We selected the predatory banded tulip snail, Cinctura hunteria, as a test case for assessment because this species is one of several designated by the Florida Fish and Wildlife as a species of concern. Using spatial count data for shells in our samples, we estimated density values for each taxonomic grade over the sampled area using IDW spatial interpolation. These maps reveal large areas of occupation across the west Florida shelf for two taxonomic grades of dead shells but loss of offshore occurrence for live records. One explanation for the lack of occurrences in offshore habitats is that, unlike dead shell records, there is no time averaging accumulation of live shells. Time averaging increases detectability of species in habitats where they are rare. However, independent fisheries data from live-only animal surveys not only mirror our live-dead results but suggest that habitat loss in our live-dead comparisons was rapid and occurred in the late 1980s or early 1990s. Thus, live-dead comparisons reveal both natural baselines as well as anthropogenic changes in distribution without being significantly distorted by time-averaging biases. Including live-dead data can greatly improve species assessments when long-term survey records are unavailable and provide a key tool in combatting biodiversity loss across marine ecosystems.
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Blanco, Arévalo, Correa i Moroño. "Lipophilic Toxins in Galicia (NW Spain) between 2014 and 2017: Incidence on the Main Molluscan Species and Analysis of the Monitoring Efficiency". Toxins 11, nr 10 (22.10.2019): 612. http://dx.doi.org/10.3390/toxins11100612.
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Galicia is an area with a strong mussel aquaculture industry in addition to other important bivalve mollusc fisheries. Between 2014 and 2017, 18,862 samples were analyzed for EU regulated marine lipophilic toxins. Okadaic acid (OA) was the most prevalent toxin and the only single toxin that produced harvesting closures. Toxin concentrations in raft mussels were generally higher than those recorded in other bivalves, justifying the use of this species as an indicator. The Rías of Pontevedra and Muros were the ones most affected by OA and DTX2 and the Ría of Ares by YTXs. In general, the outer areas of the Rías were more affected by OA and DTX2 than the inner ones. The OA level reached a maximum in spring, while DTX2 was almost entirely restricted to the fall–winter season. YTXs peaked in August–September. The toxins of the OA group were nearly completely esterified in all the bivalves studied except mussels and queen scallops. Risk of intoxication with the current monitoring system is low. In less than 2% of cases did the first detection of OA in an area exceed the regulatory limit. In no case, could any effect on humans be expected. The apparent intoxication and depuration rates were similar and directly related, suggesting that the rates are regulated mainly by oceanographic characteristics.
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KALOGIROU, S. "Ecological characteristics of the invasive pufferfish Lagocephalus sceleratus (Gmelin, 1789) in the eastern Mediterranean Sea – a case study from Rhodes". Mediterranean Marine Science 14, nr 2 (25.04.2013): 251. http://dx.doi.org/10.12681/mms.364.
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In this study, the ecological and societal impact of the invasive pufferfish Lagocephalus sceleratus on coastal habitats of an area of the eastern Mediterranean Sea (Rhodes Island) was investigated. Seasonal quantitative samplings in two common coastal habitats were used to investigate habitat use of different life-stages. Sandy areas were found to be highly important for the early life stages of L. sceleratus. In contrast, Posidonia oceanica habitats were mainly preferred by larger (> 29 cm) reproductive adults, not exceeding 64 cm. Lagocephalus sceleratus was found to feed on invertebrates and fish while size classification revealed a tendency for a diet shift with increased size. During early life stages, L. sceleratus inhabits sandy bottoms where it feeds on various invertebrates. The predominant molluscan species found in the diet of larger (> 20 cm) L. sceleratus individuals were the economically important Sepia officinalis and Octopus vulgaris. The size at which 50% of individuals reach maturity was estimated to 19 cm. With increased size, habitat shift to seagrass meadows most possibly occurs to meet both the increased demand in prey availability and requirement of appropriate spawning ground. Condition factor of L. sceleratus showed significantly higher values during summer than all other seasons and this was attributed to spawning season and increase in feeding. Societal impacts were alarming due to increased public attention concerning its lethal effects (presence of tetrodotoxin), if consumed. Its high abundance in the coastal fish communities of the studied area combined with ecological and societal impacts, clearly classify L. sceleratus a pest for fisheries and potential threat for biodiversity.
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Ngor, Peng Bun, Ratha Sor, Leang Hour Prak, Nam So, Zeb S. Hogan i Sovan Lek. "Mollusc fisheries and length–weight relationship in Tonle Sap flood pulse system, Cambodia". Annales de Limnologie - International Journal of Limnology 54 (2018): 34. http://dx.doi.org/10.1051/limn/2018026.
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Molluscs are important for ecological function, livelihoods and fisheries, but are often forgotten in research and management. Here, we investigated intra-annual variation in the landing and growth patterns of three mollusc species, i.e., Corbicula moreletiana, Pila virescens and Pila ampullacea, using one-year daily data on landing catches and values, recorded in Kampong Chhnang province of Tonle Sap (TS) Lake. Overall, 8330 tonnes with a first sale landing value of US$ 1.4 million for the three species were reported. Also, we found that C. moreletiana was abundant during the dry season with high temperature and less precipitation. By contrast, the two Pila species were abundant from the early rainy to early dry seasons when precipitation and water levels increase. The length–weight relationship analysis indicated that a faster growth in weight of Pila species occurred in the rainy season, and a general negative allometric growth was observed for the three species. This implies that their populations were intensively fished. Our preliminary results suggest that molluscs in the TS Lake (i) are important resources in support of people's livelihoods, (ii) respond differently to intra-annual variation in temperature, precipitation and hydrology and (iii) are being intensively exploited with significant reduction in growth rate. Therefore, it is necessary to conduct further comprehensive research describing status of mollusc stocks and their ecology to support long-term management and conservation of this important aquatic fauna. Our study contributes to establishing the first important baseline data and information on key mollusc species for the TS.
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Floyd, Matthew, Masaru Mizuyama, Masami Obuchi, Brigitte Sommer, Mark GR Miller, Iori Kawamura, Hiroki Kise, James D. Reimer i Maria Beger. "Functional diversity of reef molluscs along a tropical-to-temperate gradient". Coral Reefs 39, nr 5 (1.07.2020): 1361–76. http://dx.doi.org/10.1007/s00338-020-01970-2.
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Abstract Global warming is leading to range shifts of marine species, threatening the structure and functioning of ecological communities and human populations that rely on them. The largest changes are seen in biogeographic transition zones, such as subtropical reef communities, where species range shifts are already causing substantial community reorganisation. This causes functional changes in communities over subtropical latitudes, though a baseline functional understanding remains elusive for many taxa. One key marine taxon are molluscs, which provide many ecosystem services, are important prey for fishes and are also fisheries targets themselves, but remain largely unstudied. Here, we examine the trait composition, functional diversity, and functional redundancy of mollusc assemblages along the tropical-to-temperate transition in Japan (25° to 35° Northern latitude). Specifically, we use a trait database of 88 mollusc species from 31 subtropical reefs along the Pacific coast of Japan to show that trait composition of mollusc assemblages changes continuously along the latitudinal gradient. We discover that functional diversity of mollusc assemblages decreases with increasing latitude, a pattern associated with declines in functional dispersion. Moreover, we find a clear distinction between tropical and subtropical mollusc assemblages, with substrate-attached, suspension feeding bivalves more abundant in the tropics and free-living gastropod grazers more prevalent at higher latitudes. Our trait-based evidence in this study shows a contraction and almost complete shift in the functioning of marine mollusc assemblages at biogeographic transition zones and our trait database facilitates further study. Our findings provide evidence of the changing taxonomic and functional composition of extant mollusc communities with latitude, pointing to potential pertinent changes and tropicalisation of these communities with rapid ocean warming.
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Ng, Ting Hui, Ekgachai Jeratthitikul, Chirasak Sutcharit, Samol Chhuoy, Kakada Pin, Arthit Pholyotha, Warut Siriwut, Ruttapon Srisonchai, Zeb S. Hogan i Peng Bun Ngor. "Annotated checklist of freshwater molluscs from the largest freshwater lake in Southeast Asia". ZooKeys 958 (11.08.2020): 107–41. http://dx.doi.org/10.3897/zookeys.958.53865.
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The Tonle Sap Lake in Cambodia is a crucial freshwater biodiversity hotspot and supports one of the world’s largest inland fisheries. Within the Tonle Sap basin, freshwater molluscs provide vital ecosystem services and are among the fauna targetted for commercial harvesting. Despite their importance, freshwater molluscs of the Tonle Sap basin remain poorly studied. The historical literature was reviewed and at least 153 species of freshwater molluscs have been previously recorded from throughout Cambodia, including 33 from the Tonle Sap basin. Surveys of the Tonle Sap Lake and surrounding watershed were also conducted and found 31 species, 15 bivalves (five families) and 16 gastropods (eight families), in the Tonle Sap basin, including three new records for Cambodia (Scaphula minuta, Novaculina siamensis, Wattebledia siamensis), the presence of globally invasive Pomacea maculata and potential pest species like Limnoperna fortunei. This study represents the most comprehensive documentation of freshwater molluscs of the Tonle Sap basin, and voucher specimens deposited at the Inland Fisheries Research and Development Institute, Cambodia, represent the first known reference collection of freshwater molluscs in the country. In order to combat the combined anthropogenic pressures, including invasive species, climate change and dams along the Mekong River, a multi-pronged approach is urgently required to study the biodiversity, ecology, ecosystem functioning of freshwater molluscs and other aquatic fauna in the Tonle Sap basin.
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Cohen, Andrew S., Elizabeth L. Gergurich, Benjamin M. Kraemer, Michael M. McGlue, Peter B. McIntyre, James M. Russell, Jack D. Simmons i Peter W. Swarzenski. "Climate warming reduces fish production and benthic habitat in Lake Tanganyika, one of the most biodiverse freshwater ecosystems". Proceedings of the National Academy of Sciences 113, nr 34 (8.08.2016): 9563–68. http://dx.doi.org/10.1073/pnas.1603237113.
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Warming climates are rapidly transforming lake ecosystems worldwide, but the breadth of changes in tropical lakes is poorly documented. Sustainable management of freshwater fisheries and biodiversity requires accounting for historical and ongoing stressors such as climate change and harvest intensity. This is problematic in tropical Africa, where records of ecosystem change are limited and local populations rely heavily on lakes for nutrition. Here, using a ∼1,500-y paleoecological record, we show that declines in fishery species and endemic molluscs began well before commercial fishing in Lake Tanganyika, Africa’s deepest and oldest lake. Paleoclimate and instrumental records demonstrate sustained warming in this lake during the last ∼150 y, which affects biota by strengthening and shallowing stratification of the water column. Reductions in lake mixing have depressed algal production and shrunk the oxygenated benthic habitat by 38% in our study areas, yielding fish and mollusc declines. Late-20th century fish fossil abundances at two of three sites were lower than at any other time in the last millennium and fell in concert with reduced diatom abundance and warming water. A negative correlation between lake temperature and fish and mollusc fossils over the last ∼500 y indicates that climate warming and intensifying stratification have almost certainly reduced potential fishery production, helping to explain ongoing declines in fish catches. Long-term declines of both benthic and pelagic species underscore the urgency of strategic efforts to sustain Lake Tanganyika’s extraordinary biodiversity and ecosystem services.
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Petros, Peter, Matthias Heilweck i David Moore. "Saving the Planet with Appropriate Biotechnology: 5. An Action Plan". Mexican Journal of Biotechnology 6, nr 2 (1.04.2021): 1–60. http://dx.doi.org/10.29267/mxjb.2021.6.2.1.
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We evaluate suggestions to harness the ability of calcifying organisms (molluscs, crustacea, corals and coccolithophore algae) to remove permanently CO2 from the atmosphere into solid (crystalline) CaCO3 for atmosphere remediation. Here, we compare this blue carbon with artificial/industrial Carbon dioxide Capture & Storage (CCS) solutions. An industrial CCS facility delivers, at some cost, captured CO2, nothing more. But aquaculture enterprises cultivating shell to capture and store atmospheric CO2 also produce nutritious food and perform many ecosystem services like water filtration, biodeposition, denitrification, reef building, enhanced biodiversity, shoreline stabilisation and wave management. We estimate that a mussel farm sequesters three times as much carbon as terrestrial ecosystems retain. Blue carbon farming does not need irrigation or fertiliser, nor conflict with the use of scarce agricultural land. Blue carbon farming can be combined with restoration and conservation of overfished fisheries and usually involves so little intervention that there is no inevitable conflict with other activities. We calculate that this paradigm shift (from ‘shellfish as food’ to ‘shellfish for carbon sequestration’) makes bivalve mollusc farming and microalgal farming enterprises, viable, profitable, and sustainable, alternatives to all CCUS industrial technologies and terrestrial biotechnologies in use today.
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Comesaña, Natalia, i Ángel Guerra. "Application of the Gómez-Muñoz model to estimate catch and effort in the artisanal fishery for the squid Loligo vulgaris (Mollusca: Cephalopoda) in the Ría de Vigo (NW Spain)". Scientia Marina 83, nr 4 (3.12.2019): 305. http://dx.doi.org/10.3989/scimar.04917.10a.
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The Gómez-Muñoz model was developed to aid the management of small-scale or artisanal fisheries and is based on interview data from fishermen and other personnel directly related to the fishery. The non-targeted and targeted Loligo vulgaris fishery in the Ría de Vigo and the Aldán Cove is explored. Eighty-one interviews were carried out. This survey yielded 38 valid interviews, which were used to estimate the parameters of the model for the period 2011-2015. Comparison between official landings and catches estimated by this model showed discrepancies varying between 41.8% and 98.4%, depending on the fish markets considered. An 82.2% decrease of the squid catches over the period 2011-2015 was recorded. The reasons for that drop as well as the sensitivity and accuracy of the model are discussed.
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Nóbrega, Priscila Sousa Vilela da, Cleverson Ranniéri Meira dos Santos, Ana Patrícia Barros Cordeiro i Jussara Moretto Martinelli-Lemos. "Invertebrates assemblage captured by a pink shrimp's fishery on Amazon continental shelf". Latin American Journal of Aquatic Research 49, nr 2 (3.05.2021): 227–41. http://dx.doi.org/10.3856/vol49-issue2-fulltext-2600.
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Shrimp trawl fisheries constitute a major threat to continental shelves' biodiversity, given their profound impact on benthic communities. We investigated the composition of an invertebrate assemblage impacted by this type of fishery and possible correlations of the abundance and richness with specific environmental parameters. The activities of the industrial shrimp fleet on the north coast of Brazil were monitored over two years. We analyzed 20,303 specimens belonging to seven phyla (Porifera, Cnidaria, Mollusca, Sipuncula, Annelida, Arthropoda, Echinodermata) and 154 species. There was a predominance of generalist and rare species, given that most species (86) were sporadic. Taxonomic composition patterns were complex, dynamic, and were correlated mainly with the temperature and depth of the Amazon continental shelf, the largest in extension and low depth of the South Atlantic. The crustaceans were dominant in both abundance and taxonomic richness. The influence of environmental factors on the abundance of the main species is discussed. The invertebrates are a neglected component in studies of fisheries impact and important components of the ecological structure of the Amazon coast. They are an essential group for developing a holistic fisheries management approach, which will support the sustainability of the region's fisheries and preserve local aquatic communities.
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Boymurodov, Khusniddin, i Nodir Khasanov. "Influence of abiotic factors on biodiversity of the populations of bivalve molluscs of the Lower Zarafshan reservoirs". E3S Web of Conferences 265 (2021): 01012. http://dx.doi.org/10.1051/e3sconf/202126501012.
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The length of the reservoir area on the banks of the Zarafshan River and the presence of all biotopes inhabited by molluscs of the Unionidae and Corbisulidae families have made the basin a comfortable aquatic ecosystem for molluscs. The influence of rivers and fisheries on the formation of the fauna of bivalve molluscs in reservoirs is significant. We found that 10 species and 2 subspecies of bivalve molluscs were distributed in the Kuymazor reservoir and 8 species and 2 subspecies of bivalve molluscs in Shurkul. Reservoirs of Sinanodonta species are shown for the first time by us. These molluscs belong to the ecological groups like peloreophilic, rheophilic and pelolimnophilic. In the water reservoirs of Uzbekistan, the spread of bivalve molluscs by groups has common features. In all water reservoirs, an ecological group called peloreophil prevails, but the species belonging to the ecological group atre different in different water bodies. Such species of pedloelphils as Sinanodonta gibba, S. orbicularis, Corbiculina tibetensis and C. ferghanensis are predominantly found in rivers, fish farms, and water reservoirs. The most common species in the canals are Corbiculina tibetensis and C. ferghanensis. The next frequent occurrence in water reservoirs is the ecological group of rheophiles.
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Hanrio, E., J. Batley, CF Dungan i C. Dang. "Immunoassays and diagnostic antibodies for Perkinsus spp. pathogens of marine molluscs". Diseases of Aquatic Organisms 147 (4.11.2021): 13–23. http://dx.doi.org/10.3354/dao03635.
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Perkinsus sp. protozoans are parasites of a wide variety of molluscs around the world and are responsible for episodes of mass mortalities and large economic losses for aquaculture industries and fisheries. The first step towards the management of infectious episodes is the reliable detection of Perkinsus species. While historic methods for diagnosis of Perkinsus sp. infections in mollusc hosts include histological, in vitro, molecular-genetic, and immunoassays, antibody-based diagnostic assays may prove most practical with development of improved reagents and techniques. This paper reviews historic developments of antibodies against Perkinsus species, and of diagnostic immunoassays. Thirteen research papers reported the development of antibodies against Perkinsus sp. or their extracellular products, mainly P. olseni and P. marinus. Nine of those tested the cross-reactivity of their antibodies against different life stages or species than the one used as immunogen. While all antibodies raised against trophozoites labelled hypnospores, several antibodies raised against hypnospores did not label trophozoites, suggesting antigenic differences between those cell types. Antibody specificity studies showed that there is antigenic heterogeneity between Perkinsus species and Perkinsus-like organisms, and also that common epitopes occur among Perkinsus species, as well as some dinoflagellates. This review summarizes the current knowledge and aims at helping the future development of Perkinsus species-specific antibodies and immunoassays.
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Hahn, Sarah Joy, Angelika Brandt i Moritz Sonnewald. "Annotated checklist and biodiversity analysis of benthic fauna at Sylt Outer Reef and Borkum Reef Ground (North Sea)". Check List 18, nr 3 (10.06.2022): 593–628. http://dx.doi.org/10.15560/18.3.593.
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Benthic fauna caught by ring dredge and 2 m beam trawl at the NATURA 2000 Sylt Outer Reef (SAR) and Borkum Reef Ground (BRG) sites in the North Sea are examined in relation to the intensity of mobile bottom-trawling fisheries. Samples were taken from 33 stations in the two areas, and the collected benthic fauna, consisting of infauna, epifauna, and demersal fish was determined. A total of 123 species were found, consisting of the phyla Chordata, Mollusca, Arthropoda, Echinodermata, Annelida, Cnidaria, and Bryozoa, with Chordata and Mollusca being the most species-rich phyla. The species compositions of BRG and SAR are relatively clearly separated. There was greater species diversity at BRG, likely due to lower fishing pressure from mobile bottom trawling than at SAR. Long-term data acquisition and analysis will be needed to visualize past and future changes in biodiversity
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Mason, James, A. W. Newton, D. W. McKay i J. A. M. Kinnear. "Fisheries in the Orkney area". Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences 87, nr 1-2 (1985): 65–81. http://dx.doi.org/10.1017/s0269727000004164.
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SynopsisFishing has long played an important part in the economy of Orkney. Local vessels are all small, and fish predominantly inshore for shellfish. Demersal and pelagic fish are abundant in the offshore waters around Orkney, but these exposed waters can be fished only by large vessels from more distant ports, so that few fish are landed in the islands.Gadoids, especially haddock, cod and whiting, form the bulk of the demersal fish caught at Orkney. Stocks of all three are giving cause for concern, with declining spawning stock biomass and reduced recruitment. With the coming of processing, more local landing of demersal fish might occur. The closure of the herring fishery in 1977 was followed by a great expansion of mackerel fishing, but with the lifting of the ban west of 4CW in 1981, herring catches have once again become valuable. Because of fishing pressure, landings of both species are subject to quota restrictions.In recent years, the traditional fisheries for lobsters and crabs have been supplemented by a new fishery for scallops. Lobster stocks are now under some pressure. Conditions around Orkney appear suited to farming filter-feeding bivalve molluscs, and culture and marketing of Pacific oysters has started.
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Vu, Thuy Duong. "The Economic Impact of CPTPP on Vietnam’s Fisheries Exports to CPTPP Region". Journal of International Economics and Management 20, nr 2 (lipiec 2020): 1–15. http://dx.doi.org/10.38203/jiem.020.2.0007.
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The study evaluates the overall situation of Vietnam’s fisheries exports and uses the Global Simulation Analysis of Industry-Level Trade Policy model (the GSIM model) to predict the impact of the CPTPP agreement on Vietnam’s fisheries exports to the CPTPP members. It is forecasted that the CPTPP has positive effects on Vietnam’s fisheries exports. One of those is that it is promising for Vietnamese producers/exporters to access Mexico, which is a large market in the southern portion of North America. In addition, Vietnam has the advantage to continue increasing export earnings to the Japanese market after the CPTPP takes effect. By sub-sector, all sub-sectors have a positive impact on consumers/importers as well as producers/exporters. In terms of export value, all sub-sectors have increased export value, especially the Crustaceans, molluscs and other aquatic invertebrates, prepared or preserved (HS1605) export to Japan and the fish fillets and other fish meat (whether or not minced), fresh, chilled or frozen (HS0304) has significant export rise to Mexico. Nevertheless, the reduction of import tax revenues reduces the welfare of the fisheries sector.
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Wulandari, Diah Anggraini, Ernawati Widyastuti, Ismiliana Wirawati i Riyana Subandi. "Struktur Komunitas dan Keanekaragaman Makrobentos di Perairan Teluk Jakarta". Al-Kauniyah: Jurnal Biologi 14, nr 1 (30.04.2021): 115–26. http://dx.doi.org/10.15408/kauniyah.v14i1.16277.
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AbstrakTeluk Jakarta di perairan Laut Jawa terletak di sebelah utara Provinsi DKI Jakarta memiliki potensi sangat besar baik sumber daya perairannya maupun sebagai pusat aktivitas dan jasa-jasa lingkungan. Potensi pusat aktivitas meliputi sektor industri, perhubungan, perdagangan, perikanan, pariwisata, dan kependudukan. Namun kondisi perairan Teluk Jakarta semakin lama semakin kritis. Kondisi ini berpengaruh terhadap biota makrobentos seperti Mollusca, Crustacea, Echinodermata, dan Polychaeta. Penelitian ini bertujuan untuk mengetahui struktur komunitas makrobentos dan status pencemaran perairan Teluk Jakarta berdasarkan indikator biologis. Metode pengambilan sampel menggunakan Grab Smith McIntyre sebanyak tiga kali ulangan pada 9 lokasi yang berbeda. Sampel dianalisis untuk memperoleh keanekaragaman dan struktur komunitas makrobentos, indeks keanekaragaman (H’), indeks kemerataan jenis (J’), serta kualitas perairan Teluk Jakarta. Hasil menunjukkan perairan Teluk Jakarta didominasi oleh Polychaeta dengan persentase 53% (422 individu), Mollusca 33%, Crustacea 13%, dan Echinodermata 1% dengan total individu makrobentos, yaitu 793 individu. Kelimpahan makrobentos paling tinggi, yaitu Mollusca jenis Ennucula sp. (186 individu), Crustacea jenis Apseudes sp. (41 individu), dan Echinodermata jenis Aphiuridae (3 individu). Keanekaragaman jenis di perairan Teluk Jakarta termasuk kategori sedang dengan H indeks 1–2, kondisi perairan tercemar sedang, dan indeks kemerataan jenis (J’) makrobentos tinggi dengan nilai indeks >0,75 yang menunjukkan tidak adanya dominansi spesies. Abstract Jakarta Bay is located in the north of DKI Jakarta Province which has enormous potential in its water resources and as a center for environmental services. The center services include the industrial sector, transportation, trade, fisheries, tourism, and population. However, Jakarta Bay waters have suffered critical damage. This condition affects on macrobenthos such as Molluscs, Crustaceans, Echinoderms, Polychaete so the aims of this study is to determine the diversity pollution status of Jakarta Bay based on biological indicators. The sampling method use Grab Smith McIntyre with three replications in 9 different locations. Samples were analyzed to determine the diversity and structure community of macrobenthos, diversity index (H'), index of Evenness (J’) and the water quality of Jakarta Bay based on biological indicators. The results show that Jakarta Bay waters are dominated by Polychaete with a percentage of 53% (422 individuals), mollusks 33%, Crustaceans 13%, and Echinoderms 1% with a total of 793 individuals. Crustaceans consist of 23 species which are dominated by Apseudes sp. Mollusks consist of 265 individuals dominated by Ennucula sp and Echinoderms dominated by Amphiuridae. The level of species diversity in the waters of Jakarta Bay is included in the moderate category with H index 1–2, with moderate polluted waters, and the evenness index (J’) is in the high category with an index value >0,75. It indicate the absence of species dominance.
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Punt, Andre E., TzuChuan Huang i Mark N. Maunder. "Review of integrated size-structured models for stock assessment of hard-to-age crustacean and mollusc species". ICES Journal of Marine Science 70, nr 1 (1.01.2013): 16–33. http://dx.doi.org/10.1093/icesjms/fss185.
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Abstract Punt, A. E., Huang, T., and Maunder, M. N. 2013. Review of integrated size-structured models for stock assessment of hard-to-age crustacean and mollusc species. – ICES Journal of Marine Science, 70:16–33. Crustaceans and molluscs such as crabs, rock lobsters, prawns, abalone, and oysters constitute large and valuable fisheries. However, assessments of these species are hampered because they cannot be production aged, in contrast to many teleosts. The major data sources for these species, in addition to catch and abundance index data, are the size compositions of the catches and of any fishery-independent indices. Assessments of such species have been conducted using age-based methods of stock assessment, as well as surplus production models. However, size-structured methods are now preferred because they can make full use of size-composition data, are able to integrate multiple sources of data, and produce the types of outputs which are needed for management purposes. An advantage of size-based models over age-based models is that all processes can be size-based, and these processes can modify the (unmodelled) size-at-age distribution. We review these methods, highlighting the choices that need to be made when developing integrated size-structured stock assessments, the data sources which are typically available and how they are used for parameter estimation, and contrast a number of such assessments worldwide.
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Turkstra, E., M. C. Th Scholten, C. T. Bowmer i H. P. M. Schobben. "A Comparison of the Ecological Risks from Fisheries and Pollution to the North Sea Biota". Water Science and Technology 24, nr 10 (1.11.1991): 147–53. http://dx.doi.org/10.2166/wst.1991.0286.
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A prototype of the ecological risk analysis framework REFEREE is used to demonstrate a comparative evaluation of the effects of three main perturbing factors on the functioning of the North Sea ecosystem. Fisheries obviously have a large impact on fish species: some are reduced, others are increased in density. Fisheries also contribute substantially to the decline of mammals, although pollution is the main causative factor in their demise and that of birds. Oddly, some fish species appear to benefit from contamination. Eutrophication causes an increase in crustaceans, polychaetes, coelenterates and meiofauna, and a decrease in echinoderms and molluscs. Sole is one of the few fish species that appears to benefit from eutrophication, the others are suppressed.
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Tilley, Alexander, Ariadna Burgos, Agustinha Duarte, Joctan dos Reis Lopes, Hampus Eriksson i David Mills. "Contribution of women’s fisheries substantial, but overlooked, in Timor-Leste". Ambio 50, nr 1 (8.05.2020): 113–24. http://dx.doi.org/10.1007/s13280-020-01335-7.
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AbstractA greater understanding of gendered roles in fisheries is necessary to value the often-hidden roles that women play in fisheries and households. We examine women’s contributions to household food and income using focus group discussions, market surveys, and landings data in six communities in Timor-Leste. Women were actively fishing more days per month than men. Gleaning was the most frequent activity and 100% of trips returned with catch for food and/or income. Mollusc and crab catches were common and exploitation appeared targeted on a dynamic reappraisal of changing food values and changing estimates of group needs. With as many as 80% of households in coastal areas involved in fishing, and at least 50% of women fishing, this highlights the current lack of women’s engagement as a critical gap in fisheries management approaches. The current androcentric dialogue limits social-ecological understanding of these systems and the potential for their effective stewardship.
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Dairain, A., MY Engelsma, J. Drent, R. Dekker i DW Thieltges. "High prevalences of disseminated neoplasia in the Baltic tellin Limecola balthica in the Wadden Sea". Diseases of Aquatic Organisms 138 (27.02.2020): 89–96. http://dx.doi.org/10.3354/dao03448.
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The Baltic tellin Limecola balthica is one of the most common bivalves in intertidal areas in the Northern Hemisphere. Over the last 2 decades, the species has been suffering from a decrease in adult survival in the European Wadden Sea. While several factors such as global warming and fisheries have been suggested to influence the population dynamics of this bivalve mollusc, the potential role of diseases has never been investigated. In this study, we investigated whether disseminated neoplasia, a common proliferative disorder in bivalve molluscs, could play a potential role in the recent population decline of Baltic tellins in the Wadden Sea. We conducted a field survey in the Dutch Wadden Sea to (1) determine whether the disease occurs in Baltic tellins in the Wadden Sea and (2) quantify the occurrence and severity of the disease via histology. Disseminated neoplasia occurred in L. balthica at each of the 10 sampled locations with very high prevalences (21-89%) compared to those reported elsewhere for this species. The highest severity category was found in 8 to 87% of affected individuals, with severity generally increasing with prevalence. Disseminated neoplasia usually increases mortality among affected individuals and may also be associated with important sub-lethal effects, especially regarding gametogenesis. Thus, we suggest that disseminated neoplasia may play a key role in the population dynamics of the Baltic tellin, the extent of which remains to be investigated in future studies.
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Barnes, David K. A., i Kate A. Rawlinson. "Traditional coastal invertebrate fisheries in south-western Madagascar". Journal of the Marine Biological Association of the United Kingdom 89, nr 8 (20.04.2009): 1589–96. http://dx.doi.org/10.1017/s0025315409000113.
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The identification of key resource users and patterns of depletion alongside ecological data are presented for a small-scale traditional invertebrate fishery in south-western Madagascar. Men, women and children undertake the fishery in the Anakao region at different phases of the tide and for different purposes. Invertebrate harvest data from June to September 2000 estimated that more than 34 taxa were caught and were dominated by holothurians destined for export and molluscs for local consumption. Crustacea formed a small component of the fishery despite a high diversity and abundance of many potentially edible species. Although there was slight spatial variation in number of species caught and their relative importance to the fishery,Chicoreus ramosus, Fasciolaria trapeziumandOctopus vulgariswere generally most heavily targeted and were amongst the most abundant in the catch. There were several indications of over-exploitation of invertebrate stocks, including the absence of many large bodied species, low abundance of high yield species, greater catch effort needed for high yield taxa, and higher diversity of targeted species (including many low yield taxa) at sites of higher human habitation.
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Alati, Victor Mwakha, Jibril Olunga, Mike Olendo, Lillian Nduku Daudi, Kennedy Osuka, Cyprian Odoli, Paul Tuda i Lina Mtwana Nordlund. "Mollusc shell fisheries in coastal Kenya: Local ecological knowledge reveals overfishing". Ocean & Coastal Management 195 (wrzesień 2020): 105285. http://dx.doi.org/10.1016/j.ocecoaman.2020.105285.
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ROMANELLI, MICHELE. "An approximate assessment of the production levels of the Italian fishing fleet in the Mediterranean Sea during selected years in comparison with the analogous previous estimates". Mediterranean Marine Science 21, nr 1 (30.04.2020): 216. http://dx.doi.org/10.12681/mms.20671.
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During the past two decades, the organization Sea Around Us (based at the Fisheries Centre in British Columbia, Canada) has been carrying out the relevant task of reconstructing national statistics on marine fisheries for almost all countries and territories to fill information gaps and correct the general trend of severe underestimation of the “true” level of catches, discards and landings.A recent reconstruction of this kind showed that the annual catches by the Italian fleet fishing in the Mediterranean Sea had been presumably underestimated during most of the 1950-2010; in the 1970-1995 sub-period, they would have ranged from 0.7-1.1 million metric tons per year. However, comparisons with the landings for the few years for which there are “independent” estimates (i.e., not based on official statistics) show that many more bivalve molluscs and fewer “small pelagics” were caught and that the highest annual outputs reported by Sea Around Us should be presumably cut by 25%-35%.
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Fondo, Esther N., i Benrick Ogutu. "Sustainable crab fishery for Blue Economy in Kenya". Aquatic Ecosystem Health & Management 24, nr 1 (2.01.2021): 21–26. http://dx.doi.org/10.14321/aehm.024.01.05.
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Abstract Lakes, rivers and oceans provide unique resources and support fisheries and aquaculture worldwide. The fisheries and aquaculture sector of Kenya contributes approximately 0.8% to the country’s GDP. Marine production is about 9 000 tonnes per year. Marine finfish form the bulk of the marine production, while shellfish (e.g. prawns, lobsters and crabs), molluscs (e.g. octopi and squids) are underexploited. The Fishery sector has the potential of about USD 5 billion for the Blue Economy in Kenya. Crab fishery in Kenya is active in some areas of the south and north coast. The crab resources along the Kenyan waters are diverse and a variety of species are edible. The most commonly fished crab by artisanal fishers is the Mangrove Mud Crab Scylla serrata. Semi-commercial and industrial fishers usually have portunid and other deep sea crabs as by-catch in trawl and longline fisheries, which in many cases are unutilized. Exports of live crabs have increased over the years, with exports mainly to Asian countries. Export of frozen crabs started recently. The need to sustainably utilize lake, river and ocean resources is recognized and important in promoting Blue Economy. Sustainable development of crab fishery provides a potential area for the Blue Economy development in Kenya. Research is essential to crab fishery development.
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Mason, James, i D. I. Fraser. "Shellfish fisheries in the Clyde Sea Area". Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences 90 (1986): 439–50. http://dx.doi.org/10.1017/s0269727000005145.
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SynopsisThe Clyde Sea Area has long been associated with shellfish fishing and has shared in the large expansion which has occurred during the past thirty-five years in the Scottish industry. Here, as elsewhere, the expansion has been helped by the establishment of processing facilities and in 1983 the landings of shellfish from the Clyde reached £4–5 million in value.The sea bed and shores in the Clyde provide a wide range of habitats which is reflected in the commercially important species which are taken. They range from the fine mud in which Norway lobsters burrow, through sand in which cockles occur, and sandy gravel which is suitable for scallops and queens, to the hard ground inhabited by lobsters and the rocky shores on which periwinkles abound.The most important shellfish in the Clyde, with annual landings valued at £3–75 million, is the Norway lobster, which is dealt with by Bailey et al. (1986). This contribution considers all the other species. The most valuable are scallops and queens, which now together exceed £400,000 p.a. in value. Periwinkles are gathered extensively on rocky shores. Squid are taken sporadically, by light trawlers and seine-netters, and occasionally, when they are especially abundant, form the basis of a directed fishery. Creel fishing for lobsters, edible crabs and velvet swimming crabs is less widespread than elsewhere round Scotland, but provides a useful income for a few boats. Mussels and cockles are gathered on a small scale, and cockle stocks in the Clyde proved especially valuable after English and Welsh stocks had been depleted by the severe winter of 1962–63. The only surviving fishery for the native oyster in Scotland is in the Clyde, in Loch Ryan, and attempts are being made to improve its production. Sea lochs in the Clyde offer conditions, particularly shelter, suitable for cultivating filterfeeding bivalve molluscs.
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Agustina, Bella Pradita, Ana Ariasari, Tony Budi Satriyo i Eko Setyobudi. "Food Preference of Bullet Tuna (<i>Auxis rochei</i> Risso, 1810) in Prigi Coast of Trenggalek Regency, East Java". Journal of Tropical Biodiversity and Biotechnology 8, nr 1 (13.03.2023): 72939. http://dx.doi.org/10.22146/jtbb.72939.
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As a commercial fish, bullet tuna is constantly caught in purse seine fisheries to provide economic benefits for coastal communities. Biological information such as food preference has to be known due to their sustainability in the future. This research aims to figure out the food composition and preference of bullet tuna (Auxis rochei Risso, 1810) in Prigi Coast, Trenggalek Regency East Java. A total of 294 fish landed by purse seine fishermen have been collected from March up to May 2018. Each individual was measured in its total length and weight, then was dissected for sex determination, measured the length of intestine, and analyse the stomach content. The data analysis encompasses frequency distribution of total length, relative gut length, frequency of occurrence, index of preponderance, trophic level, niche breadth, and food overlapping. The research result indicates that the main foods of Auxis rochei are fish and crustacean, while the complementary and additional foods were copepod, mollusc, annelid, and debris. Bullet tuna was a carnivorous fish with the trophic level of 3.7 and shows the existence of competition for food resources. Overlapping of feeding occurred in the 19-20 cm long group against the 23-24 cm long group in male fish and the 19-20 cm size group against the 21-22 cm length group in female fish. Bullet tuna use the same feed resources among the size groups of fish, where females use feed over a wider area than males.
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Saptanto, Subhechanis. "DAYA SAING EKSPOR PRODUK PERIKANAN INDONESIA DI LINGKUP ASEAN DAN ASEAN-CHINA". Jurnal Sosial Ekonomi Kelautan dan Perikanan 6, nr 1 (7.07.2017): 51. http://dx.doi.org/10.15578/jsekp.v6i1.5754.
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Keunggulan komparatif dapat digunakan sebagai indikator besarnya daya saing suatu negara dalam perdagangan internasional. Penelitian ini bertujuan untuk menganalisis daya saing ekspor perikanan Indonesia di tingkat ASEAN dan ASEAN-China. Kajian ini menggunakan data sekunder time series yang dikeluarkan oleh United Nation Comtrade dari tahun2000 hingga 2008. Metode analisis yang digunakan adalah dengan metode Revealed Comparative Advantage (RCA). Hasil penelitian menunjukkan bahwadi tingkat ASEAN maupun ASEAN-China, produk perikanan Indonesia yang memiliki daya saing adalah produk dengan kode HS 03 (ikan, udang-udangan, hewan lunak, invertebrata perairan), HS 710110 (mutiara dari alam yang belum diolah), HS 710121 (mutiara budidaya yang belum diolah), dan HS 121220 (rumput laut dan alga lainnya). Hal ini menunjukkan bahwa Indonesia masih lemah dalam hal ekspor produk yang memiliki nilai tambah. Tittle: Comparative Advantage of Indonesian Fisheries Product in ASEAN and ASEAN-China.Comparative advantage can used as indicator of trade level in international trade. This study aim to analyze comparative advantageof Indonesian fisheries product in both of ASEAN and ASEAN-China. This study used secondary data of UN Comtrade from 2000 until 2008 and revealed comparative advantage (RCA) method. Results of this study show that in both of ASEAN and ASEAN-China, for HS 03 (Fish, crustaceans, molluscs, aquatic invertebrates), HS 710110 (Pearls natural, not permanently mounted or set), HS 710121 (pearls cultured unprocessed), and HS 121220 (seaweeds and other algae), Indonesia still vave comparative advantage in fisheries product. This results indicate that Indonesia considers a weak position in the valued added export of the fisheries product.
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Hvingel, Carsten, Bernard Sainte-Marie i Gordon H. Kruse. "Cold-water shellfish as harvestable resources and important ecosystem players". ICES Journal of Marine Science 78, nr 2 (7.02.2021): 479–90. http://dx.doi.org/10.1093/icesjms/fsab005.
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Abstract The symposium, Shellfish—Resources and Invaders of the North, took place 5–7 November 2019 in Tromsø, Norway. Approximately 110 participants presented and discussed 60 talks and 25 posters. Of these, ten articles are published in this symposium issue. The goal of this symposium was to discuss the role of shellfish, both as harvestable resources and as important ecosystem players in northern hemisphere cold marine environments. To provide perspective for the symposium, the development of four major crustacean fisheries (northern shrimp, snow crab, Homarus, Norway lobster) are reviewed. Our review showed that landings of all these fisheries are still in a state of flux due to inherent population dynamics, fishing, and climate change. The talks and posters covered a broad range of state-of-the-art bioecological knowledge and present challenges in the assessment and management of the most ecologically and/or commercially important cold-water shellfish species belonging to the phyla Arthropoda, Mollusca, and Echinodermata. Various alternative harvesting and management techniques were presented along with perspectives for shellfish aquaculture. Methods and models for stock assessment were thoroughly covered as well as the ecological role of shellfish, their population dynamics, new insights into their biology and genetics, and their changing distribution and significance as invasive species.
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Benallal, A. M., A. Baaloudj i A. Kerfouf. "Natural diet of deep-water rose shrimp in the Beni-Saf Bay (Western Algeria)". Ukrainian Journal of Ecology 10, nr 4 (10.08.2020): 109–15. http://dx.doi.org/10.15421/2020_176.
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The deep-water rose shrimp, Parapenaeus longirostris (Lucas, 1846) is one of the Decapod crustacean species that is targeted by coastal and deep-sea demersal fisheries in the western Mediterranean, in the Algerian west coast in particular. Despite its socio-economic importance and commercial interest across the country, there were only few studies focusing on its biology and ecology and no species development plan has been drawn up for now. Our study of the rose shrimp diet was based on the analysis of the faunistic composition of the ingested prey. Seasonal sampling was carried out at Beni Saf port (western Algeria) during 2018-2019, from landings from inshore trawling fisheries. A total of 641 individuals were analyzed, while taking account of males and females and size classes. Results of stomach content analyzes showed a wide range of benthic and endobenthic species. Crustacea are the preferred prey (F=77.69%), followed by Foraminifera, Annelida Polychaeta, and Mollusca with respective frequencies of (77.22%, 58.50% and 52.73%). Radiolaria, Porifera and Echinodermata represent a less important part in the diet of this species and constitute accidental prey, whose frequency is less than 10%. Benthic organisms with silt ingest the plant and various debris, which are the secondary prey with an average frequency of 14.81%.
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Hasanah, Nur, Putu Eka Sudaryatma, Imanuddin Razaq, Ni Nyoman Eriawati, Wahyu Andy Nugraha, Hidayati Kumalasari, Ni Putu Arya Shintya Anggraeni i Ida Ayu Mirah Meliana Dewi. "Early Detection of Contamination Vibrio parahaemolyticus and Escherichia coli in Fisheries Product Using Multiplex Polymerase Chain Reaction". Jurnal Sain Veteriner 40, nr 2 (31.08.2022): 171. http://dx.doi.org/10.22146/jsv.73314.
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The fisheries sector provided a significant contribution to the Indonesian economy by increasing export activities in every year. The exported fisheries product are categorized of live fish, frozen fish, preservation products from various types of fish, crustaceans, and molluscs. The contamination of pathogenic bacteria Vibrio parahaemolyticus and Escherichia coli causing healthy problems originating from the fishery sector (sea-food borne disease). These two bacteria contaminated fisheries product is due to mishandling and storaging in the processing, which causes acute diarrhea, gastrointestinal infections and fever. The multiplex polymerase chain reaction (mPCR) method was developed to increase the efficiency of time, effort and accuracy of the bacterial contamination testing process. The mPCR method begins with the optimization of the two bacterial gene targets, sensitivity test, specificity test and then applied to samples of fishery products. The mPCR method is carried out in two mechanisms, namely “one-run” conducted from bacterial colonies isolated on agar media and “one-tube” which is applied directly from fishery products. The results of the development of the mPCR method on V. parahaemolyticus and E. coli resulted in sensitivity at concentrations of DNA 5.6 pg/ml and DNA 5.5 pg/ml, respectively. One-tube mPCR application obtained 7 positive colonies of V. parahaemolyticus and 38 positive colonies of E. coli. Meanwhile, one-tube mPCR which was applied directly from shrimp samples could identify the two bacteria.
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Tamano, Luana Tieko Omena, Beethoven Brandão Correia de Lima, Joseane Da Silva i Daniel de Magalhães Araujo. "FISHING, PROCESSING, COMMERCIALIZATION AND A PROPOSE TO FISHERY WASTE REUSE OF SURURU Mytella falcata IN THE MUNDAÚ LAGOON, MACEIÓ – AL, BRAZIL". Caminhos de Geografia 21, nr 76 (3.08.2020): 306–20. http://dx.doi.org/10.14393/rcg217652255.
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A diagnosis was made on the fishing, processing, commercialization and generation of residues of the sururu fishery in Mundaú lagoon, Maceió-AL. Thirty nine fishermen were interviewed and also incursions were made for observations. Furthermore, sururus were collected to perform biometry. Residue of the sururu processing was collected to the fabrication of sururu waste meal (SWM), posteriorilly its bromatological composition was analysed. Fishermens of sururus fish 4.56 times week-1 and each fishing excursion lasts 5h26min, yielding 18.61 cans (18.61 to 37.22 kg soft tissue). Besides the sururus, 77.92% also catch fish, shrimp, and other organisms to complement the income. Average selling price was R$ 6.92 per kg of edible and CPUE from 3.42 to 6.85kg edible day-1. The average size and weight are 33.21 mm and 1.62 g, with 782.53 g of waste being generated to produce 1.0 kg of meat. SWM contained 37.00% calcium. It was verified that there is a need to create a management plan capable of reducing environmental impact in the lagoon, implement fishing programs and waste management, as well as improve the structure for the processing of that mollusc. Studies of the use of SWM as a source of calcium in diets are also recommended.
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Fanelli, G., S. Piraino, G. Belmonte, S. Geraci i F. Boero. "Human predation along Apulian rocky coasts (SE Italy): desertification caused by Lithophaga litho-phaga (Mollusca) fisheries". Marine Ecology Progress Series 110 (1994): 1–8. http://dx.doi.org/10.3354/meps110001.
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GONZALEZ, M., E. BARCALA, J. L. PEREZ-GIL, M. N. CARRASCO i M. C. GARCIA-MARTINEZ. "Fisheries and reproductive biology of Octopus vulgaris (Mollusca: Cephalopoda) in the Gulf of Alicante (Northwestern Mediterranean)". Mediterranean Marine Science 12, nr 2 (30.06.2011): 369. http://dx.doi.org/10.12681/mms.38.
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The common octopus Octopus vulgarisCuvier, 1797 is the most fished cephalopod species along the Spanish coasts. Its catches are highly fluctuating due to the short life cycle of the species and to the annual variability of the recruitment pattern, strongly dependent on the environmental conditions affecting the eggs and paralarvae. This study examines the common octopus fishery, the catch composition, and the main features of the reproductive biology of this species in the Gulf of Alicante (Spanish Eastern coast, Western Mediterranean FAO division 37.1.1). The common octopus fishery was studied analysing the monthly landing and effort data by fishing gear from 1994 to 2005. Monthly samplings of the commercial O. vulgarislandings from trawlers and clay pots from January 2004 to December 2005 resulted in the measuring of 1833 specimens to enable analysis of the catch composition, and allowed the biological sampling of 1176 individuals to provide the reproductive parameters of the species in the study area. The length-weight relationship calculated for the species was BW = 0.51 * DML 2.87. The yearly sex ratios (males:females) were 1:1 (trawl, 2004), 1:0.74 (trawl, 2005), and 1:0.88 (clay pots, 2005). The size (dorsal mantle length, DML) at maturity of the species in the study area was 9.67 cm for males and 14.38 cm for females. The gonadosomatic index reached a peak between April and July for males and in July for females. The Fulton condition index was lower in both sexes between June and September, and for males in November-December, whereas for both sexes the values of the digestive gland index were at their maximum between June and December. The energy allocation between somatic and reproductive growth was investigated and the results suggested that the energy spent on reproduction mainly came from feeding, and not from energy stored in the mantle tissues or in the digestive gland
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Gianeti, Michel Donato, Leandro Yokota, Rosangela Paula Teixeira Lessa i June Ferraz Dias. "Diet of longnose stingray Hypanus guttatus (Myliobatiformes: Dasyatidae) in tropical coastal waters of Brazil". Journal of the Marine Biological Association of the United Kingdom 99, nr 8 (4.11.2019): 1869–77. http://dx.doi.org/10.1017/s0025315419000912.
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AbstractThis study investigated the diet of longnose stingray Hypanus guttatus in the tropical waters of north-eastern Brazil. Samples were obtained from monthly sampling of artisanal fisheries from August 2007 to July 2008. A total of 258 specimens were examined, 127 females and 131 males, and stomach contents analysis suggested H. guttatus to be a generalist and opportunistic predator feeding on the most available prey in the environment. There was no significant difference in the diet composition of males and females, or between seasons. However, an ontogenetic dietary shift was observed with larger individuals having an increased proportion of molluscs in the diet, whilst smaller individuals predated primarily on small crustaceans.
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Shepelevych, V., A. Berezkina, T. Tretiakova i N. Matvienko. "The problem of contamination of aquatic ecosystems with antibiotics (a review)". Ribogospodarsʹka nauka Ukraïni., nr 1(63) (31.03.2023): 3–32. http://dx.doi.org/10.15407/fsu2023.01.003.
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Purpose: To analyze and summarize information on the problem of contamination of aquatic ecosystems with antibiotics. Findings: The presented work describes global risks associated with the presence of antibiotics in the aquatic environment and aquatic organisms, and demonstrates quantitative and qualitative assessment of contamination with antibiotic residues in ocean aquatic resources using bivalves. Practical value. The review can be useful for the public engaged in ecology, agriculture, veterinary medicine, and fisheries; for experts in the field of pharmacology and microbiology. This paper can also be interesting for teachers and students of field-oriented universities. Keywords: Antibiotics, wastewater contamination with antibiotics, antibiotic resistance, stability genes, aquatic biocenoses, aquaculture, bivalve molluscs.
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Da Le, Nhu, Thi Thu Ha Hoang, Vu Phong Phung, Thi Lien Nguyen, Thi Thuy Duong, Le Minh Dinh, Thi Mai Huong Pham i in. "Trace Metal Element Analysis in Some Seafood in the Coastal Zone of the Red River (Ba Lat Estuary, Vietnam) by Green Sample Preparation and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)". Journal of Analytical Methods in Chemistry 2021 (4.03.2021): 1–14. http://dx.doi.org/10.1155/2021/6649362.
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Fisheries and aquaculture production in the coastal zone of Vietnam contribute significantly to the national economy. However, seafood quality and safety, especially in terms of metal contents, are of increasing concern, for both domestic and international markets. This paper presents the results of an investigation in some trace metal elements (iron (Fe), zinc (Zn), manganese (Mn), copper (Cu), arsenic (As), cadmium (Cd), and mercury (Hg)) concentrations in some fishes, crustaceans, and molluscs in the coastal zone of the Red River (in the Ba Lat estuary in Thai Binh and Nam Dinh provinces) during four sampling campaigns in 2020. All samples were treated by a green sample preparation using microwave digestion and then analyzed by inductively coupled plasma-mass spectrometry (ICP-MS). The results showed that the trace metal element concentrations in fish, crustacean, and mollusc samples decreased in the following order: Fe > Zn > Mn > Cu > As > Cd ∼ Hg. In more details, the ranges of trace metal elements in seafood samples were 13.13–202.73; 7.63–82.71; 0.48–22.73; 0.72–15.58; 0.18–5.12; 0.001–1.114; and 0.001–0.923 mg·kg−1 for Fe, Zn, Mn, Cu, As, Cd, and Hg, respectively. The research results contribute to the dataset of the seafood (both fishery and aquacultural seafood) quality in the Red River coastal zone. Although the mean values of different trace metal elements observed in this study were lower than the allowed values of Vietnam’s or European’s threshold for food safety, some high concentrations were detected. The survey results suggest the need to expand the monitoring scope (frequency of monitoring, number of samples, and observed variables) for obtaining a fully comprehensive assessment of seafood quality in this region. Our results also indicate that it is necessary to manage water quality in coastal areas, especially where aquaculture activities are carried out.
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Peterson, Charles H. "Recruitment overfishing in a bivalve mollusc fishery: hard clams (Mercenaria mercenaria) in North Carolina". Canadian Journal of Fisheries and Aquatic Sciences 59, nr 1 (1.01.2002): 96–104. http://dx.doi.org/10.1139/f01-196.
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Because of their high fecundity, marine invertebrate fisheries are rarely considered at risk to recruitment overfishing. This presumption can be criticized on population theoretic grounds and conflicts with growing evidence of recruitment limitation in a variety of marine invertebrate populations. Sampling in 11 years spanning a 24-year period from 1978 to 2001 reveals that hard clam (Mercenaria mercenaria (L.)) recruitment declined significantly by 6572% within the fishing grounds of central North Carolina. This 24-year period began when high demand and prices drove increased clamming effort. Accordingly, landings grew rapidly 5-fold, a yield that was not sustained and subsequently fell by over 50% from 1983 to 2000. Fishery-independent sampling repeated identically in three representative habitats demonstrates declines of 17, 79, and 95% in hard clam density and of 24, 46, and 83% in spawning stock biomass during the 18+ years of 19801997. Small-scale experiments and measurements in depleted habitats show no compensatory enhancement of hard clam recruitment with local reduction in adult density. Consequently, the hard clam in North Carolina serves as perhaps the most compelling example of unsustainable fishing mortality leading to recruitment overfishing in a bivalve mollusc stock. Spawner sanctuaries could serve to restore and protect spawning stock biomass in this and other invertebrate fisheries.
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Clavier, Jacques, i Olivier Richard. "Growth of juvenile Haliotis tuberculata (Mollusca: Gastropoda) in their natural environment". Journal of the Marine Biological Association of the United Kingdom 66, nr 2 (maj 1986): 497–503. http://dx.doi.org/10.1017/s0025315400043083.
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INTRODUCTIONThe ormer (Haliotis tuberculata L.) occurs in some abundance off the north coast of Brittany and the Channel Islands. On the French coast, exploitation of this species is not legally authorised except in the intertidal zone and the sublittoral stocks have for some years aroused the interest of local fishermen. Studies have therefore been initiated to investigate the exploitation potential of this new resource, and different aspects of the biology and ecology of the ormer have been examined so as to make use of models of population dynamics. Thus, a study of growth merits particular attention.
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Xavier, José C., A. Louise Allcock, Yves Cherel, Marek R. Lipinski, Graham J. Pierce, Paul G. K. Rodhouse, Rui Rosa i in. "Future challenges in cephalopod research". Journal of the Marine Biological Association of the United Kingdom 95, nr 5 (26.06.2014): 999–1015. http://dx.doi.org/10.1017/s0025315414000782.
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Cephalopods (Mollusca: Cephalopoda) play an important role as keystone invertebrates in various marine ecosystems, as well as being a valuable fisheries resource. At the World Malacological Congress, held 21–28 July 2013 in Ponta Delgada, Azores, Portugal, a number of cephalopod experts convened to honour the contribution of the late Malcolm R. Clarke, FRS (1930–2013) to cephalopod research. Endorsed by the Cephalopod International Advisory Council (CIAC), the meeting discussed some of the major challenges that cephalopod research will face in the future. These challenges were identified as follows: (1) to find new ways to ascertain the trophic role and food web links of cephalopods using hard tissues, stable isotopes and novel concepts in theoretical ecology; (2) to explore new approaches to the study of cephalopod morphology; (3) to further develop cephalopod aquaculture research; (4) to find new ways to ascertain cephalopod adaptation and response to environmental change; (5) to strengthen cephalopod genetics research; and (6) to develop new approaches for cephalopod fisheries and conservation. The present paper presents brief reviews on these topics, followed by a discussion of the general challenges that cephalopod research is bound to face in the near future. By contributing to initiatives both within CIAC and independent of CIAC, the principle aim of the paper is to stimulate future cephalopod research.
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Pinnegar, J. K., N. V. C. Polunin i F. Badalamenti. "Long-term changes in the trophic level of western Mediterranean fishery and aquaculture landings". Canadian Journal of Fisheries and Aquatic Sciences 60, nr 2 (1.02.2003): 222–35. http://dx.doi.org/10.1139/f03-016.
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We explored changes in western Mediterranean fishery and aquaculture landings using trophic level (TL) estimates derived from nitrogen stable isotope analysis combined with geographically detailed fishery data collated by the General Fisheries Council for the Mediterranean (GFCM). Our analyses confirmed earlier suggestions that there has been a significant decline in the mean trophic level of Mediterranean landings (by ~0.15 TL over 26 years). However, this decline is suggested to be almost entirely a result of increased landings of bivalve molluscs from mariculture and not due to changes in landings from capture fisheries. The mean trophic level of finfish landings has not changed significantly since 1973, although both fish and total landings have become significantly more diverse. Inspection of small pelagic fish landings revealed a marked decrease in the contribution played by anchovy and replacement of this species by sardine. Since 1981, cage culture of high trophic level species such as sea bass (Dicentrarchus labrax) and seabream (Sparus aurata) has become increasingly important, such that when clupeoid landings were excluded from the analyses, the mean trophic level of finfish landings was actually demonstrated to have increased over the past 26 years.