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Rick, Torben C., Leslie A. Reeder-Myers, Courtney A. Hofman, Denise Breitburg, Rowan Lockwood, Gregory Henkes, Lisa Kellogg i in. "Millennial-scale sustainability of the Chesapeake Bay Native American oyster fishery". Proceedings of the National Academy of Sciences 113, nr 23 (23.05.2016): 6568–73. http://dx.doi.org/10.1073/pnas.1600019113.
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Estuaries around the world are in a state of decline following decades or more of overfishing, pollution, and climate change. Oysters (Ostreidae), ecosystem engineers in many estuaries, influence water quality, construct habitat, and provide food for humans and wildlife. In North America’s Chesapeake Bay, once-thriving eastern oyster (Crassostrea virginica) populations have declined dramatically, making their restoration and conservation extremely challenging. Here we present data on oyster size and human harvest from Chesapeake Bay archaeological sites spanning ∼3,500 y of Native American, colonial, and historical occupation. We compare oysters from archaeological sites with Pleistocene oyster reefs that existed before human harvest, modern oyster reefs, and other records of human oyster harvest from around the world. Native American fisheries were focused on nearshore oysters and were likely harvested at a rate that was sustainable over centuries to millennia, despite changing Holocene climatic conditions and sea-level rise. These data document resilience in oyster populations under long-term Native American harvest, sea-level rise, and climate change; provide context for managing modern oyster fisheries in the Chesapeake Bay and elsewhere around the world; and demonstrate an interdisciplinary approach that can be applied broadly to other fisheries.
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Chetveryk, O. V., i N. A. Kravchuk. "The research of the oyster’s market condition: current state and future perspective development on the basis of marketing". Bioeconomics and Agrarian Business 11, nr 1 (29.05.2020): 98–110. http://dx.doi.org/10.31548/bioeconomy2020.01.098.
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The article conducts a marketing study of the oyster market in Ukraine and in the world. In the article was analyze the current state and prospects for future perspective development of the oyster market in Ukraine. The possibility of developing the market of oysters and enterprises of the oyster industry under the conditions of marketing use is considered. The results of the study showed that fisheries in Ukraine are a promising area of agro-industrial production, which provides the population with valuable food and promotes employment. The marketing research was based on the analysis of the supply of oysters in the world and Ukraine, the volume of demand in the domestic market of Ukraine, the characteristics of the main producers of oysters. The analysis suggests that the leading countries in oyster farming are China, Japan and the United States. A study of the dynamics of oyster production in the world showed their constant growth, and in 2018 received 4.7 million tons of oysters. The supply on the domestic market of oysters in Ukraine consists of imports and direct domestic production: 90% - import, 10% - domestic production. Ukraine's oyster imports fell from $ 9.5 million. to 5.98 million dollars, but still occupies the lion's share. The largest domestic producers of oysters are next companies: Silveo LLC (38%), Odyssey LLC (20%), Ocean LLC (13%), Triton-chernomor Company (11%). Despite imports and low domestic production, oyster consumption in Ukraine remains low at 0.9 kg per person per year. The consistently low demand for sea-food and oysters, in particular, is due to the steady deterioration of the economic situation and low purchasing power of the population. A prerequisite for the long-term and perspective development of the oyster market and oyster’s cultivation enterprises is the use of marketing. The most popular for oyster’s enterprises are traditional and cognitive marketing. The most popular instruments of cognitive marketing for the oyster enterprises are creating social videos about cinnamon of seafood, including oysters, organizing of the food festivals and food festivals of the sea-products, have been thoroughly disseminated, as well as take part in other trips, organizing tasting events at the festival and other.
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BOOKER, MATTHEW MORSE. "Oyster Growers and Oyster Pirates in San Francisco Bay". Pacific Historical Review 75, nr 1 (1.02.2006): 63–88. http://dx.doi.org/10.1525/phr.2006.75.1.63.
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In the late nineteenth century San Francisco Bay hosted one of the American West's most valuable fisheries: Not the bay's native oysters, but Atlantic oysters, shipped across the country by rail and seeded on privately owned tidelands, created private profits and sparked public resistance. Both oyster growers and oyster pirates depended upon a rapidly changing bay ecosystem. Their struggle to possess the bay's productivity revealed the inqualities of ownership in the American West. An unstable nature and shifting perceptions of San Francisco Bay combined to remake the bay into a place to dump waste rather than to find food. Both growers and pirates disappeared following the collapse of the oyster fishery in the early twentieth century.
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Imamshadiqin, Imamshadiqin, Erniati Erniati, Muliari Muliari, Salmarika Salmarika, Arina Ruzanna, Imanullah Imanullah, Rizalul Fikri i Hizrah Ayumi Sitanggang. "Inovasi desain keramba untuk budidaya tiram dalam meningkatkan ekonomi masyarakat pesisir di Gampong Cot Seurani, Kabupaten Aceh Utara (Innovation of cage design for oyster cultivation on improving the economy of coastal communities in Cot Seurani Village, Aceh Utara District)". Buletin Pengabdian Bulletin of Community Services 3, nr 3 (31.12.2023): 96–101. http://dx.doi.org/10.24815/bulpengmas.v3i3.34975.
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Cot Seurani Village is one of the coastal villages in Muara Batu District, North Aceh Regency which has fisheries and marine potential that can be used as oyster cultivation land. The people in Cot Seurani Village predominantly work as fishermen, the potential of existing oysters has not been utilized optimally, they still collect them directly from nature, such as on rocks at TPI and its surroundings. The aim of this service activity is to introduce, socialize and directly practice the innovation of oyster cages which can be used as oyster cultivation business land in Cot Seurani Village, North Aceh in order to encourage oyster farmers to open oyster cultivation businesses independently and in a measurable manner using economical materials. The stages of this activity include program planning, preparation, socialization on making oyster cages, lowering oyster cages into the sea and monitoring and evaluating to publishing the results of the service in print media and scientific journals, as well as making reports on the results of the service. The final result, in the form of samples of oyster cage products that have been lowered into the sea, can be used by oyster farmers as an environmentally friendly oyster cultivation area to facilitate the production process and improve the welfare of oyster farmers in Cot Seurani Village.
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Love, Gabrielle, Shirley Baker i Edward V. Camp. "Oyster-Predator Dynamics and Climate Change". EDIS 2021, nr 1 (25.02.2021): 5. http://dx.doi.org/10.32473/edis-fa228-2020.
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Oysters are one of the most important natural resources found in coastal and estuarine areas of Florida, but some Florida oyster populations appear to be declining. One possible driver of oyster population decline is increased mortality from oyster predators, including marine snails. But other environmental factors, such as changes in temperature or salinity, may also affect oysters. This 5-page fact sheet written by Gabrielle Love, Shirley Baker, and Edward V. Camp and published by the UF/IFAS School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences describes how a changing climate may affect oysters directly but also indirectly by affecting their predators.https://edis.ifas.ufl.edu/fa228
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Hayden-Hughes, Maria, Philippa Bayford, Jonathan King i David Smyth. "The European native oyster, Ostrea edulis, in Wales, a historical account of a forgotten fishery". Aquatic Living Resources 36 (2023): 7. http://dx.doi.org/10.1051/alr/2022024.
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The history of the European native oyster has been documented for numerous countries within its natural range. However, the history of Ostrea edulis in Wales remains conspicuously absent from current UK and European peer-reviewed publications. It was therefore deemed necessary to address this and as a result in-depth research of archival data was conducted including local trade directories, decennial census returns, collections from the National Museum Wales, annual government fisheries reports and grey literature from local historical societies. These historical reviews resulted in the construction of a timeline which documents all the significant historical dates related to O. edulis in Wales from the early 1500 s to present day. Fisheries statistics for England and Wales were also analysed for the western regional oyster fisheries in an attempt to understand the contribution which the Welsh landings made to the region. The review revealed that the Welsh fishery was the primary contributor of regional landings from the early 1600 s with maximum landings reported 1894, with the oyster beds at Mumbles producing more oysters than any other port until the fishery closed in 1937. A commercial native oyster fishery no longer exists in Wales but there remains a small native oyster population in South Wales. It is hoped that the historical accounts of bountiful catches, overexploitation, and restoration of O. edulis over the centuries in Wales may offer current conservation practitioners an insight into failures and mistakes of the past which could benefit the future of the European flat oyster in Wales.
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Hesterberg, Stephen G., Gregory S. Herbert, Thomas J. Pluckhahn, Ryan M. Harke, Nasser M. Al-Qattan, C. Trevor Duke, Evan W. Moore, Megan E. Smith, Alexander C. Delgado i Christina P. Sampson. "Prehistoric baseline reveals substantial decline of oyster reef condition in a Gulf of Mexico conservation priority area". Biology Letters 16, nr 2 (luty 2020): 20190865. http://dx.doi.org/10.1098/rsbl.2019.0865.
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The Gulf of Mexico (GoM) is home to the world's largest remaining wild oyster fisheries, but baseline surveys needed to assess habitat condition are recent and may represent an already-shifted reference state. Here, we use prehistoric oysters from archaeological middens to show that oyster size, an indicator of habitat function and population resilience, declined prior to the earliest assessments of reef condition in an area of the GoM previously considered pristine. Stable isotope sclerochronlogy reveals extirpation of colossal oysters occurred through truncated life history and slowed growth. More broadly, our study suggests that management strategies affected by shifting baselines may overestimate resilience and perpetuate practices that risk irreversible decline.
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Mazón-Suástegui, José Manuel, Abel Betanzos-Vega, Norberto Capetillo-Piñar, Hever Latisnere-Barragán i Nadia Livia Ortiz-Cornejo. "Oyster production and meat yield in Crassostrea spp. (bivalvia: Ostreidae) in Pinar del Rio, Cuba". Ecosistemas y Recursos Agropecuarios 5, nr 15 (3.09.2018): 501. http://dx.doi.org/10.19136/era.a5n15.1241.
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The main fishing enterprise located in the province of Pinar del Río, Cuba, markets oyster meat packed in brine bags of 460 g. The oysters come from natural bank fisheries (mangrove and bottom oyster), and from farms (mangrove oyster). Although the capture during 2009 – 2013 showed an increasing trend (50 to > 80 t), the oyster meat yields recorded values below (3.3 – 3.9 %), the acceptable minimums (4.9 %); in addition, a decrease in meat weight was observed between the packaging and commercialization, impacting productivity. The objectives of the study were the assessment of oyster exploitation based on the meat yield, and to assess the meat loss in the final packed product. A monthly and annual yield variation analysis and their relationship between fishery type and oyster size was performed. Meanwhile, the loss of meat was analyzed by different treatments of oyster / brine proportions. Significant differences (p < 0.05) of meat yield (%) by oyster species and size with a better performance in the farmed oysters were observed. The traditional proportion of packing for commercialization (meat / brine, 391 g / 69 g = 460 g), influenced the weight-loss of meat by leakage of interstitial fluid. After the treatments with different proportions of meat / brine, the proportion 1:1 showed the least loss of meat weight. The breach of commercial size and the lack of cleanliness of the oysters before the shell removing process, impacted the meat yield analysis during 2009-2013
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Okronipa, Harriet, Alyssa Abreu, Katie Fiorella, Helena Bentil, Seth Adu-Afarwuah i Brietta Oaks. "Fishery Management Practices and Oyster Consumption Among Oyster-Harvesting Communities in Ghana". Current Developments in Nutrition 6, Supplement_1 (czerwiec 2022): 595. http://dx.doi.org/10.1093/cdn/nzac060.053.
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Abstract Objectives Sustainable management of fisheries is important for improving nutrition and food security. In 2017, an oyster harvesters’ association in Ghana began implementing a 5-month (Nov-Apr) closed season to improve oyster yields of the Densu estuary. It is unknown how much oysters contribute to the diet of women during the open season and whether there is a substantial reduction in oyster consumption during the closed season This study aimed to examine oyster consumption during the open and closed seasons and the perception of the closed season. Methods We recruited women (n = 137) residing in 4 major communities located near the Densu estuary in the Ga-South Municipality of Ghana. We collected data on oyster harvesting and consumption using a survey and a 30-day food frequency questionnaire during the closed (March 2020) and open (August 2020) seasons. The amount of oysters consumed was determined by converting reported portion sizes to grams using average wet weights of oysters purchased in the study area. We used McNemar's test for paired samples to compare differences in the proportion of women who consumed oysters, and Wilcoxon signed-rank test to compare differences in the amount of oysters consumed. Results A majority (63%) of the women were oyster harvesters. Significantly higher proportion of women consumed oysters in the 30 days preceding the interview during the open compared to the closed season (57% vs 13%, p < 0.0001). Among those who consumed oysters, the mean ± SD oysters (wet weight) consumed at a sitting was 218.4 ± 114.7 g, equivalent to 60 oysters, and did not differ between the open (211.6 ± 119.9 g) and closed ((242.8 ± 92.6 g) seasons (P = 0.73). The majority of women were aware of the closed season (87%) and viewed it positively (85%). Conclusions The majority of women in these communities consume oysters during the open season, and are in support of the closed season. Considering that a smaller percentage of women consumed oysters during the closed season, additional research is warranted to further examine the aggregate impacts of oyster management in Ghana on nutrition and household food insecurity, considering both consumption and income impacts. Funding Sources University of Rhode Island.
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Mendonça, JT, i IC Machado. "Mangrove oyster (Crassostrea spp.) (Sacco, 1897) extractivism in Cananéia estuary (São Paulo, Brazil) from 1999 to 2006: capture and management evaluation". Brazilian Journal of Biology 70, nr 1 (luty 2010): 65–73. http://dx.doi.org/10.1590/s1519-69842010000100010.
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The oyster Crassostrea spp. is one of the main fisheries resources in the southern portion of São Paulo State. This paper aims to evaluate the extractivism of that resource, supplying subsidies to the implementation of management regulations. This study was developed in Cananéia, from February 1999 to December 2006. The oyster production data in dozens was obtained through weekly or monthly interviews. The annual and average CPUE in dozens per day was analysis to verify significant differences along years. There are no regulations that limit the fishing effort or organize the admission in the fishermen. The admission is controlled by the condition of the market and there is a risk of increasing the fishing effort above the sustainable yield, which demands measures that control the number of fishermen enganged in the activity. Those measures, to be effective, must be created in discussion with the fisheries sector, based on technical information.
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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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Florini, Styliano, Esmaeil Shahsavari, Arturo Aburto-Medina, Leadin S. Khudur, Stephen M. Mudge, David J. Smith i Andrew S. Ball. "Are Sterols Useful for the Identification of Sources of Faecal Contamination in Shellfish? A Case Study". Water 12, nr 11 (2.11.2020): 3076. http://dx.doi.org/10.3390/w12113076.
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This work aimed to identify the major source(s) of faecal pollution impacting Salcott Creek oyster fisheries in the UK through the examination of the sterol profiles. The concentration of the major sewage biomarker, coprostanol, in water overlying the oysters varied between 0.01 µg L−1 and 1.20 µg L−1. The coprostanol/epicoprostanol ratio ranged from 1.32 (September) to 33.25 (February), suggesting that human sewage represents the key input of faecal material into the estuary. However, a correlation between the sterol profile of water above the oysters with that of water that enters from Tiptree Sewage Treatment Works (r = 0.82), and a sample from a site (Quinces Corner) observed to have a high population of Brent geese (r = 0.82), suggests that both sources contribute to the faecal pollution affecting the oysters. In identifying these key faecal inputs, sterol profiling has allowed targeted management practices to be employed to ensure that oyster quality is optimised.
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Latue, Milyan, Alex Retraubun i Renoldy L. Papilaya. "STRATEGI PEMBERDAYAN PEMUDA MELALUI BUDIDAYA TIRAM MUTIARA DI NEGERI HATUSUA KECAMATAN KAIRATU". PAPALELE (Jurnal Penelitian Sosial Ekonomi Perikanan dan Kelautan) 4, nr 2 (31.12.2020): 64–70. http://dx.doi.org/10.30598/papalele.2020.4.2.64.
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Hatusua is a country located in West Seram district and is one of the pearl oyster farming locations. Pearl oyster cultivation in Hatusua country has been around since 2007. The cultivation methods used are KJA and longline methods. Pearl oyster cultivation in the country of Hatusua is also one of the village programs carried out based on the cooperation of the village government with PT Globalindo Mutiara where the company is a company engaged in the fisheries sector, namely pearl shell cultivation. The existing empowerment program requires a more focused development on improving the welfare of the community (youth) without neglecting various aspects, both socio-economic, technical and institutional. The purpose of this paper is to determine youth empowerment development strategies through cultivation of mutaira oysters in Hatusua country. Data analysis using process hierarchy analysis (AHP) includes socio-economic, technical and institutional aspects. Selection of the main criteria chosen by respondents in the AHP assessment based on a comparison of the three main criteria as the most selected criteria for the empowerment strategy were the socio-economic aspects of 41.2% followed by technical aspects of 32.6% and institutional aspects of 26.2%. The combination of the synthesis of the assessment results in the AHP calculation shows that the sequence of the implementation of the youth empowerment strategy is employee wages, family dependents, land suitability, worker skills, land area, business experience, state regulations, government programs, and support from the Marine and fisheries Service.
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Mafambissa, Mizeque, Mery Rodrigues, Torres Taimo, Carlos Andrade, Mats Lindegart i Adriano Macia. "Gametogenic Cycle of the Oysters Pinctada capensis (Sowerby III, 1890) and Saccostrea cucullata (Born, 1778) (Class Bivalvia) in Inhaca Island, Southern Mozambique: A Subsidy for Bivalve Culture in the Region". Diversity 15, nr 3 (2.03.2023): 361. http://dx.doi.org/10.3390/d15030361.
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This study describes reproductive aspects of the Pinctada capensis (pearl oyster) and Saccostrea cucullata (rocky shore oyster) in Inhaca Island, southern Mozambique (Western Indian Ocean). Adult oysters were collected monthly over two years within seagrass banks for P. capensis and rocky shore habitats for S. cucullata. The animals were evaluated using biometric and histological analyses of the gonads. Of the total population, females were predominant among larger individuals (>55 mm) and males were more dominant among smaller individuals (<55 mm) for both species. The sex ratio was (1 M–1.5 F) for Pinctada capensis and (1 M–1.6 F) for Saccostrea cucullata. Five gonad maturation stages were identified: indifferent, developing I, developing II, ripe and spent. The size at first maturity was mm and 26.2 mm for pearl oysters females and males, respectively, whereas for rocky shore oysters was 32.8 and 28.3 mm for females and males, respectively. We conclude that the reproduction of S. cucullata and P. capensis occurs mainly in summer, with a short resting period in winter, when many oysters are in the indifferent stage. These results provide valuable information to fisheries for management of both species in the area.
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Gupta, Sujata. "Crunch time ahead for Gulf oyster fisheries". New Scientist 207, nr 2779 (wrzesień 2010): 12. http://dx.doi.org/10.1016/s0262-4079(10)62311-1.
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Mafambissa, Mizeque Julio, Celia Angelica Gimo, Carlos Pestana Andrade i Adriano Afonso Macia. "Catch per Unit Effort, Density and Size Distribution of the Oysters Pinctada capensis and Saccostrea cucullata (Class Bivalvea) on Inhaca Island, Southern Mozambique". Life 13, nr 1 (28.12.2022): 83. http://dx.doi.org/10.3390/life13010083.
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Oysters are important resources for the daily diet, a source of economic income for many coastal communities and a delicacy for the tourism industry. In this study, the oysters (Pinctada capensis and Saccostrea cucullata) were investigated with the aim to assess the catch per unit effort, density and size composition. The study was conducted over a three-year period on Inhaca Island, Southern Mozambique. For both species, perception of fishery trends from collectors was carried out through habitat censuses and interviews. Transects, quadrats and daily fisheries catches approaches were used. Results show that P. capensis is the most exploited on the island. A total of 72.1% of respondents pointed that the oyster P. capensis is decreasing, due to excessive catching (75.4%) followed by natural death (24.6%), while 20.9% affirmed that the resource is stable and 7.0% are unaware about the resource trend. Oyster densities, sizes and catches per unit effort were higher in less accessible areas only for P. capensis. The present study provides valuable baseline information to recommend best practices to improve the exploitation, and access the need for introduction of aquaculture, towards the sustainable management and conservation of oysters, and ultimately to ameliorate people’s livelihoods.
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Cameron, Tom C., Russell Smart, Alice Lown, Alex Baker i Rebecca Korda. "Experimental estimation of ladder dredge efficiency for capture of European flat oysters over mixed sediment". Aquatic Living Resources 36 (2023): 28. http://dx.doi.org/10.1051/alr/2023021.
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Fishing gear-based landings or survey methods are often used to make assessments of species stock abundance. In order to convert catch into abundance values, estimates or assumptions are made on the catch efficiency of the gear-based method. This is the case in areas where flat oysters, Ostrea edulis, are surveyed for fisheries and conservation objectives in a range of projects across Europe. Flat oyster dredge efficiency assumptions vary widely from 5–30% in published studies and uncertainty in what is an appropriate efficiency estimate has led some survey teams to switch to Catch-per-unit-effort (CPUE), where CPUE is also of concern should catch efficiency change with shellfish density, ground type or some other unmeasured variable such as shellfish distribution. We undertook an experimental approach to estimate dredge efficiency in a standard ladder dredge used to harvest and survey adult flat oysters in the UK and Ireland. The dredge efficiency trials assessed how efficiency was influenced by oyster density (between 1 and 2.2 oysters m2), distribution (clumped vs uniform) and ground types across a gradient of more hard to more soft surface sediments. Dredge efficiency was significantly affected by oyster distribution, but also density and ground hardness as well as their interactions. While a median value between 7 and 10% seems an appropriate universal ladder dredge efficiency to adopt, ground type and distribution had such an effect that local conditions may effect this considerably. Catch efficiency was negatively density-dependent, this makes CPUE methods challenging where oyster densities are likely to vary. Practitioners, regulators and researchers conducting surveys can improve CPUE approaches through standard techniques and knowledge of how catch efficiency varies as we have presented here.
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Neimark, Julie. "Characterization of the Cell Surface of Perkinsus marinus, a Pathogen of the Eastern Oyster, Crassostrea virginica Utilizing Electron Microscopy, Light Microscopy and Epifluorescent Microscopy." Microscopy and Microanalysis 4, S2 (lipiec 1998): 1146–47. http://dx.doi.org/10.1017/s143192760002585x.
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Perkinsus marinus is a protistan parasite that infects the Eastern Oyster, Crassostrea virginica, and is one factor responsible for the reduced productivity of oyster fisheries. This parasite (or related species) has a wide distribution and has also been found to infect the oysters in the Tampa Bay region. A significant aspect of this organism has been its enigmatic taxonomic position. Originally classified in two separate fungal genera, it currently is considered an Apicomplexan (Kingdom Protista) based on transmission electron microscopy studies of the zoospore revealing an apical complex. However, rRNA studies have shown that P. marinus may be more closely related to the dinoflagellates. The focus of my study has been on surface features of certain developmental stages that may aid in a definitive taxonomic placement of this organism.Transmission electron microscopy observations of the trophozoite and hypnospore stages show variation in both the size of the organism and the presence of a cell wall.
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Syahidah, Dewi. "Research of Pearl Oyster Culture in Indonesia (2011-2021): A Bibliometric Analysis". Jurnal Moluska Indonesia 6, nr 1 (1.04.2022): 29–35. http://dx.doi.org/10.54115/jmi.v6i1.57.
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Pearl oyster is one type of mollusk that has great potential to be developed in several regions in Indonesia, such as West Papua, Maluku, Bali, and West Nusa Tenggara (NTB). The development of the marine and fisheries industry, including the pearl industry, is quite rapid, encouraging Indonesian scientists to conduct research and development related to the cultivation of the pearl oyster. To map the trend of pearl oyster research in Indonesia and the potential for further research, this paper explores research that has been carried out for ten years (2011-2021) based on the Google Scholar database through a bibliometric analysis, followed by visualization using the VOSviewer software. It was found that during the period, pearl oyster researchers were divided into 32 clusters and Cokrowati (4 documents) was the most dominating researcher in studying pearl oyster cultivation, followed by Ginting and Mukhlis (3 docs). The type of pearl oyster that has been most studied related to farming is pearl oyster (Pinctada maxima) and the penguin wing oyster shell (Pteria penguin). This study provides opportunities to develop research on both species.
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Alleway, Heidi K., Ruth H. Thurstan, Peter R. Lauer i Sean D. Connell. "Incorporating historical data into aquaculture planning". ICES Journal of Marine Science 73, nr 5 (2.11.2015): 1427–36. http://dx.doi.org/10.1093/icesjms/fsv191.
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Abstract Marine historical research has made progress in bridging the gap between science and policy, but examples in which it has been effectively applied remain few. In particular, its application to aquaculture remains unexplored. Using actual examples of natural resource management in the state of South Australia, we illustrate how historical data of varying resolution can be incorporated into aquaculture planning. Historical fisheries records were reviewed to identify data on the now extinct native oyster Ostrea angasi fishery throughout the 1800 and early-1900s. Records of catch, number of boats fishing, and catch per unit effort (cpue) were used to test fishing rates and estimate the total quantity of oysters taken from select locations across periods of time. Catch quantities enabled calculation of the minimum number of oysters per hectare for two locations. These data were presented to government scientists, managers, and industry. As a result, interest in growing O. angasi increased and new areas for oyster aquaculture were included in regulatory zoning (spatial planning). Records of introductions of the non-native oyster Saccostrea glomerata, Sydney rock oysters, from 1866 through 1959, were also identified and used to evaluate the biosecurity risk of aquaculture for this species through semi-quantitative risk assessment. Although applications to culture S. glomerata in South Australia had previously been declined, the inclusion of historical data in risk assessment led to the conclusion that applications to culture this species would be accepted. The examples presented here have been effectively incorporated into management processes and represent an important opportunity for the aquaculture industry in South Australia to diversify. This demonstrates that historical data can be used to inform planning and support industry, government, and societies in addressing challenges associated with aquaculture, as well as natural resource management more broadly.
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Garland, Carey J., Victor D. Thompson, Matthew C. Sanger, Karen Y. Smith, Fred T. Andrus, Nathan R. Lawres, Katharine G. Napora i in. "A multi-proxy assessment of the impact of environmental instability on Late Holocene (4500-3800 BP) Native American villages of the Georgia coast". PLOS ONE 17, nr 3 (2.03.2022): e0258979. http://dx.doi.org/10.1371/journal.pone.0258979.
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Circular shell rings along the South Atlantic Coast of North America are the remnants of some of the earliest villages that emerged during the Late Archaic (5000–3000 BP). Many of these villages, however, were abandoned during the Terminal Late Archaic (ca 3800–3000 BP). We combine Bayesian chronological modeling with mollusk shell geochemistry and oyster paleobiology to understand the nature and timing of environmental change associated with the emergence and abandonment of circular shell ring villages on Sapelo Island, Georgia. Our Bayesian models indicate that Native Americans occupied the three Sapelo shell rings at varying times with some generational overlap. By the end of the complex’s occupation, only Ring III was occupied before abandonment ca. 3845 BP. Ring III also consists of statistically smaller oysters harvested from less saline estuaries compared to earlier occupations. Integrating shell biochemical and paleobiological data with recent tree ring analyses shows a clear pattern of environmental fluctuations throughout the period in which the rings were occupied. We argue that as the environment became unstable around 4300 BP, aggregation at villages provided a way to effectively manage fisheries that are highly sensitive to environmental change. However, with the eventual collapse of oyster fisheries and subsequent rebound in environmental conditions ca. post-3800 BP, people dispersed from shell rings, and shifted to non-marine subsistence economies and other types of settlements. This study provides the most comprehensive evidence for correlations between large-scale environmental change and societal transformations on the Georgia coast during the Late Archaic period.
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Abdul Manan, Sony Angga Satrya,. "Prakiraan Kesuburan Perairan Bali Dari Citra Satelit [Forecast Fertility Bali Waters From Satellite Imagery]". Jurnal Ilmiah Perikanan dan Kelautan 4, nr 1 (24.01.2019): 81. http://dx.doi.org/10.20473/jipk.v4i1.11589.
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Abstract Aplication Ocean Remote Sensing technology to many use for field fisheries, once use this technology in forecast fertility water. The aim of this study was to determine the feasibility of Bali coastal area for cage of pearl oyster culture. The method used is a descriptive method of data collection. Satellite image processing activities Aqua/Terra Modis starting with the collection of satellite image data from the database NASA via OceanColor Web site, the selection of a clean image data, and than download of satellite images. The first stages of image data processing are used software ENVI 4.7, with procedures are coloring the image, limiting the minimum and maximum temperatures and sea surface chlorophyll-a, and classifiying of the image based on the value of sea surface temperature. Sea surface temperature parameter determine the location of the cage of pearl oysters (Pinctada maxima) culture. Suitability of the location of the cage of pearl oyster culture on Bali coastal area, at coordinates 8° 33' 00.97 " - 8° 42' 05.30" South Latitude and 115° 18' 03.40 " - 115° 39 ' 03.21" East Longitude. Based on geographical, that the location in the southeastern Bali coastal area and on the northern area of Nusa Pennida island.
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Munroe, Daphne M., Eileen E. Hofmann, Eric N. Powell i John M. Klinck. "How do shellfisheries influence genetic connectivity in metapopulations? A modeling study examining the role of lower size limits in oyster fisheries". Canadian Journal of Fisheries and Aquatic Sciences 70, nr 12 (grudzień 2013): 1813–28. http://dx.doi.org/10.1139/cjfas-2013-0089.
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Fisheries can potentially alter evolutionary processes such as genetic connectivity and lead to genotypic changes in stocks. Using an individual-based metapopulation genetics model, we examined the possible influence of oyster (Crassostrea virginica) fisheries on genetic connectivity. We simulated a range of realistic fishing pressures, with and without a minimum size limit (limit = 63.5 mm), over a range of fishing scenarios including single-area and stock-wide fisheries. Movement of a neutral marker gene provided an indicator of gene transfer between populations. Simulations showed that fishing may alter genetic connectivity. Increasing fishing pressure tended to decrease potential for fished populations to export genes in fisheries with and without size limits. On average, when instantaneous fishing mortality, location, and time period are held constant, fishing unrestricted by size results in a 3.5% lower allele export. Depression of the spawning potential ratio by unrestricted fishing relative to size-limited fishing argues for more conservative fishing mortality targets for unrestricted fisheries. These results demonstrate the importance of considering the influence of fisheries on source–sink dynamics in future management of marine populations.
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Alves, Francisco Arimatéia dos Santos, Eliane Brabo de Sousa, Maíra Pompeu Martins, Cássia Christina da Silva Rocha, Silvia Maria Mathes Faustino, Rosivaldo Alcântara Mendes, Marcelo de Oliveira Lima i Maria Paula Cruz Schneider. "Evaluation of Paralytic Shellfish Toxins in Marine Oyster Farming and Microalgae in the Atlantic Amazon Evidences Safety but Highlights Potential Risks of Shellfish Poisoning". Toxins 14, nr 10 (22.09.2022): 654. http://dx.doi.org/10.3390/toxins14100654.
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Marine phycotoxins are organic compounds synthesized by some species of microalgae, which accumulate in the tissues of filter-feeder organisms such as bivalve mollusks. These toxins can cause acute intoxication episodes in humans, a severe threat to aquaculture and fisheries. In the State of Pará, Brazil, oyster farming has community, artisanal and sustainable bases, using mangroves as cultivation environment and seed banks. In small-scale production, there are often no established methods of safeguarding the health of consumers elevating the potential risks of shellfish poisoning outbreaks. Our study evaluated the presence of phycotoxins in oysters cultivated in five municipalities in the region of the Atlantic Amazon (Pará, Brazil) assessing the quality of the final product. We further evaluated the microalgae, water quality, and the spatio-temporal variation of physicochemical factors in the same area. Diatoms dominated the microalgae composition, followed by dinoflagellates, some of which are reported to be potentially toxic and producers of paralytic shellfish toxins. For the first time, we describe the occurrence of the potentially toxic dinoflagellate Ostreopsis sp. in the Amazon region. Furthermore, for the first time, toxins were detected in oyster farming in the northeast of the State of Pará, namely GTX2,3, STX, and dc-STX nevertheless, with nontoxic values. The identified toxins represent a potential threat to shellfish consumers.
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Lunt, Jessica, i Delbert L. Smee. "Turbidity alters estuarine biodiversity and species composition". ICES Journal of Marine Science 77, nr 1 (11.11.2019): 379–87. http://dx.doi.org/10.1093/icesjms/fsz214.
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Abstract Turbidity is widely regarded for modulating primary production and influencing the distribution of submerged aquatic vegetation. Although less well studied, turbidity can also have significant effects on trophic interactions and food webs by modifying light penetration and scattering, influencing foraging ability of visual-hunting predators such as fishes. By interfering with visual foragers, turbidity may shift food webs towards predators that forage with other sensory modalities (e.g. chemoreception and mechanoreception), consequently altering food web structure. We analysed turbidity effects on estuarine community composition and biodiversity in the Gulf of Mexico by analysing an 18-year fisheries-independent data set and assessing communities inhabiting contemporary oyster reefs (Crassostrea virginica). In the long-term data set, elevated turbidity was associated with decreased fish species richness and diversity and higher abundances of benthic species that rely more on chemoreception for foraging and predator avoidance (e.g. crabs). High turbidity may provide a predation refuge for crabs and other benthic organisms that visually oriented fish prey upon. On oyster reefs, crabs readily consume suspension-feeding organisms including newly settled oysters and porcelain crabs (Petrolisthes armatus). Both were significantly less abundant in high turbidity. Human practices that increase turbidity may indirectly influence trophic interactions, species distributions, ecosystem function, and biodiversity.
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Espriella, Michael, i Vincent Lecours. "Using Drone Imagery to Map Intertidal Oyster Reefs along Florida’s Gulf of Mexico Coast". Gulf and Caribbean Research 34 (2023): 89–96. http://dx.doi.org/10.18785/gcr.3401.14.
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Eastern oyster (Crassostrea virginica) reefs offer vital ecosystem services and support economically and culturally important fisheries. However, environmental and anthropogenic stressors have led to significant decline in oyster reef coverage globally and locally in places like the Suwannee Sound in Florida, USA. Current monitoring methods are insufficient for timely and accurate assessment of oyster resources in the region. Here we demonstrate how drone imagery can be used to delineate intertidal oyster reef coverage rapidly and reliably. The high spatial resolution offered by drone imagery enables accurate delineations. We use a segmentation algorithm to delineate reefs, which produces consistently detailed outlines that are more representative of reef morphology than manual delineations. In total, 1,394 reefs were delineated, which corresponds with 497, 670 m2 of reef area. Of the delineated reefs, 236 (17%) were newly mapped, aligning with 19,848 m2 of newly mapped intertidal oyster reef habitat. The overlapping drone imagery also enabled the production of digital surface models, which were used to calculate volume to area ratio as an indicator of reef condition. These delineations and features serve as accurate baseline data that can be compared to future surveys to monitor how reefs are changing over time in the Suwannee Sound. These methods can also be expanded to other geographical areas and can aid in identifying early signs of decline in oyster reefs.
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Theodorou, John A., Vasileios Minasidis, Athina Ziou, Alexandra S. Douligeri, Marios Gkikas, Evangelia Koutante, George Katselis, Orestis Anagnopoulos, Nikos Bourdaniotis i Dimitrios K. Moutopoulos. "Value Chain for Non-Indigenous Bivalves in Greece: A Preliminary Survey for the Pearl Oyster Pinctada imbricata radiata". Journal of Marine Science and Engineering 11, nr 1 (4.01.2023): 95. http://dx.doi.org/10.3390/jmse11010095.
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The present study investigates through an integrated survey, for the first time in Greek shellfish market, the marketing distribution towards a new edible shellfish product that of the non-indigenous pearl oyster Pinctada imbricata radiata. The survey conducted through personal interviews on sector entrepreneurs/staff of the supply (i.e., shellfish producers, wholesalers, fishmongers, owners of restaurants). Internet-based quantitative research was also conducted to explore the market supply of the pearl oyster covering all nine regional units of Greece. The market for pearl oyster seems to be there as a substitute of the major commercial species in seasons of shortages. There is a specimen mislabeling throughout Greece, thus, extraction of significant information about the market supply of pearl oyster is deficient. Further knowledge on the bivalve shellfish value chain is needed, to define how the wild and the farmed species (mussels) interact in the market and in the distribution channels, toward a product-easy to use in the supply chain and friendly to the consumer. Findings also raises additional concerns as a priority for conservation, and the current practices do not satisfy the Common Fisheries Policy in terms of traceability.
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Scyphers, Steven B., Sean P. Powers, Kenneth L. Heck i Dorothy Byron. "Oyster Reefs as Natural Breakwaters Mitigate Shoreline Loss and Facilitate Fisheries". PLoS ONE 6, nr 8 (5.08.2011): e22396. http://dx.doi.org/10.1371/journal.pone.0022396.
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Loch, Jennifer M. H., Linda J. Walters, Melinda L. Donnelly i Geoffrey S. Cook. "Restored Coastal Habitat Can “Reel In” Juvenile Sportfish: Population and Community Responses in the Indian River Lagoon, Florida, USA". Sustainability 13, nr 22 (19.11.2021): 12832. http://dx.doi.org/10.3390/su132212832.
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Coastal habitats are declining worldwide, which has impacted economically important fisheries, especially in the Indian River Lagoon, Florida. As a result, extensive intertidal oyster reef and living shoreline restoration projects have been implemented. Restoration can also theoretically benefit predator populations, but this relationship is understudied. Here, the impact of habitat restoration on juvenile predatory fish (i.e., sportfish) populations (abundance) and communities (species richness, diversity, and assemblage) was assessed prior to and following oyster reef restoration and living shoreline stabilization for up to three years, and incorporated the influence of 17 environmental predictor variables. Juvenile sportfish abundance and richness (n = 11) were variable over time but collectively higher on restored oyster reefs compared to controls, and similar between control and stabilized shorelines. Sportfish abundance was best described by a combination of biotic features of the site (e.g., reef height and benthic substrate cover), prey abundance, decreasing distance to the nearest ocean inlet and dissolved oxygen. Results suggest future restoration site selection should emphasize adequate dissolved oxygen (~6 mg/L), oyster densities above 50/m2 and reef height above 55 mm, and minimum shoreline vegetation coverage of 50% to support macrofaunal prey and subsequently attract sportfish. These findings can help natural resource managers better use habitat restoration as a tool for enhancing fish populations in the future.
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Mahu, Edem, Salieu Sanko, Allieubakarr Kamara, Ernest Obeng Chuku, Elizabeth Effah, Zacharie Sohou, Yaovi Zounon i in. "Climate Resilience and Adaptation in West African Oyster Fisheries: An Expert-Based Assessment of the Vulnerability of the Oyster Crassostrea tulipa to Climate Change". Fishes 7, nr 4 (16.08.2022): 205. http://dx.doi.org/10.3390/fishes7040205.
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Globally, over 85% of oyster reefs have been lost, and the combined effects of climate change, ocean acidification, and environmental degradation, including pollution and mangrove overharvesting, could further reduce global oyster fisheries in the coming decades. To understand the level of impact of climate change on the oyster fishery in West Africa, an expert-based vulnerability assessment to climate change was conducted for the West African mangrove oyster (Crassostrea tulipa, Lamarck 1819). Using a combination of the exposure of the oyster to climatic stressors (estuarine temperature, salinity, river flow, surface run-off, sea level rise, and estuarine circulation) together with an assessment of sensitivity to these stressors, we estimate the overall vulnerability of C. tulipa to climate change. A very high overall climate vulnerability score of 12 on a scale of 16 was calculated for C. tulipa. While the overall climate exposure score in the West African coastal region remained high, the high sensitivity of C. tulipa to hydrographic conditions of its habitat, in particular salinity, coupled with its sessile and habitat-specific nature, pushed the overall vulnerability to very high. Early life history settlement requirements, adult mobility, and sensitivity to salinity were the three most important biological and sensitivity attributes that determined the vulnerability score. By leaving each of these three sensitivity attributes out of the analysis, the overall vulnerability score was reduced to 9 (i.e., from very high to high). A negative directional effect of climate change, coupled with a low potential for change in distribution, threatens the C. tulipa fishery in a long-term adverse climate scenario. We recommend management efforts that incorporate climate resilience and adaptation practices to prioritize recruitment success, as well as the development of breeding lines with climate-resilient traits.
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Gilby, Ben L., Andrew D. Olds, Charles H. Peterson, Rod M. Connolly, Christine M. Voss, Melanie J. Bishop, Michael Elliott, Jonathan H. Grabowski, Nicholas L. Ortodossi i Thomas A. Schlacher. "Maximizing the benefits of oyster reef restoration for finfish and their fisheries". Fish and Fisheries 19, nr 5 (25.06.2018): 931–47. http://dx.doi.org/10.1111/faf.12301.
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Mace III, Marvin M., i Michael J. Wilberg. "Using censored regression when estimating abundance with CPUE data to account for daily catch limits". Canadian Journal of Fisheries and Aquatic Sciences 77, nr 4 (kwiecień 2020): 716–22. http://dx.doi.org/10.1139/cjfas-2019-0093.
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In fisheries where there is a limit on total catch in a given period, catch-per-unit-effort (CPUE) data may not be proportional to abundance because catches may be censored at the limit. Commonly used depletion estimators (e.g., Leslie method) could be biased when ordinary least squares (OLS) regression is used to estimate abundance with censored CPUE data. We used simulations to examine the performance of OLS regression and a censored regression approach when estimating abundance and exploitation using censored CPUE data over a range of known exploitation rates. We also applied the censored regression approach to data from a commercial fishery for the eastern oyster (Crassostrea virginica). The censored regression approach always performed better than the OLS regression when estimating abundance and exploitation in our simulations. Harvest and abundance of oysters in Fishing Bay, Maryland, increased during 2009 to 2013 and then decreased through 2016, while exploitation rates had no substantial trend over time. The censored regression approach is useful for estimating abundance and exploitation when the distribution of CPUE is affected by daily catch limits.
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Alam, Jamaluddin Fitrah, Tamiji Yamamoto, Tetsuya Umino, Shinya Nakahara i Kiyonori Hiraoka. "Modeling the Efficacy of Three Types of Artificial Timber Reefs in Mitsu Bay, Japan". Water 12, nr 7 (15.07.2020): 2013. http://dx.doi.org/10.3390/w12072013.
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With the aim of simultaneously improving fishery production and utilizing forestry and oyster fishery wastes, three types of artificial timber reefs (ATRs)—constructed from simple timbers, timbers with oyster shells from local oyster farms, and timbers with leaves/branches from forest thinning—were deployed in Mitsu Bay, Japan. We developed a food web model to investigate the relative efficacies of these ATR types compared with the bare, sandy seafloor. The model described the material flow through the food webs formed in each ATR type and their potential to increase fisheries production. The model outputs were validated with observational data over three years. The model fit the observed biomass of both prey animals and fish predators. The simulation results highlighted that ATRs, particularly those with additional materials, had two to three times higher feeding flow than the sandy seafloor and resulted in increased fish biomass. Fish catch doubled in the ATR areas compared to the bare seafloor. Aside from providing a feeding ground, the complexity of the ATRs with additional materials likely acts to provide shelter for juvenile fish. ATR deployment using by-products such as those mentioned above may not only enhance fish stock but also help foster the establishment of a recycling-oriented society.
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Paolisso, Michael. "Cultural Models and Cultural Consensus of Chesapeake Bay Blue Crab and Oyster Fisheries". NAPA Bulletin 28, nr 1 (wrzesień 2007): 123–35. http://dx.doi.org/10.1525/napa.2007.28.1.123.
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ACARLI, Sefa, Harun YILDIZ i Pervin VURAL. "Morphometric Characteristics of Invasive Species Magallana gigas (Thunberg, 1793) in Bandırma Bay, Marmara Sea". Marine Science and Technology Bulletin 12, nr 3 (28.09.2023): 322–31. http://dx.doi.org/10.33714/masteb.1337592.
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Türkiye’s seas are the scene of the spread of invasive species in the entire Mediterranean basin due to the marine transportation of alien species and intensive aquaculture activities. In order to protect the natural ecosystem and track invasive species’ effects, these species must first be accurately identified and their distribution areas specified. The alien species, Magallana gigas (Pacific oyster), has introduced along the Turkish coasts. This study was carried out to determine the morphometric characteristics of Magallana gigas in the Bandırma Bay-Balıkesir between November 2013 and October 2014. Shell length varied between 68.08 mm (February) and 93.14 mm (April) during the year. Shell height was measured at the lowest 41.90 mm in February, and the highest 59.46 mm in June. Shell width was 35.80 mm in November when the study started, and it decreased gradually and reached its lowest value in February. W/L relationship of M. gigas was calculated as W=0.411×L2.653(R2=0.064) This study includes knowledges on morphometric relationships for the Pacific oyster which is crucial for the management of fisheries, aquaculture activities and native species (Ostrea edulis).
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Octavina, Chitra, i Shella Afriana. "The length-weight relationship of Magallana gigas in Krueng Cut, Province of Aceh, Indonesia". BIO Web of Conferences 87 (2024): 01004. http://dx.doi.org/10.1051/bioconf/20248701004.
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This study aims to determine the length-weight relationship of Magallana gigas in Krueng Cut, Banda Aceh City. The research was conducted in October 2020 at Krueng Cut River, Syiah Kuala District, Banda Aceh City. The oyster identification process was carried out at the Laboratory of Marine Biology, Faculty of Marine and Fisheries, Universitas Syiah Kuala. The method used in this study was simple random sampling method. In addition, water quality data were also collected in situ and substrate collected ex situ. The Ostreidae group found in Krueng Cut, Banda Aceh City is the Magallana gigas species. The average oyster found in Krueng Cut, Banda Aceh City is small with length growth ranging from 20 to 50.2 mm. The results showed that the growth pattern of Magallana gigas was classified as negative allometric at three research stations in Krueng Cut River, Banda Aceh, this was based on the value of b < 3. Environmental factors from the three research stations in Krueng Cut, Banda Aceh City are still within the normal limits of Magallana gigas life.
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Kirby, M. X. "Fishing down the coast: Historical expansion and collapse of oyster fisheries along continental margins". Proceedings of the National Academy of Sciences 101, nr 35 (23.08.2004): 13096–99. http://dx.doi.org/10.1073/pnas.0405150101.
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Hallegraeff, Gustaaf, i Christopher Bolch. "Unprecedented toxic algal blooms impact on Tasmanian seafood industry". Microbiology Australia 37, nr 3 (2016): 143. http://dx.doi.org/10.1071/ma16049.
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While most microscopic algae provide food for filter-feeding shellfish and larvae of crustaceans and finfish, other so-called Harmful Algal Blooms (HABs) can have negative effects, causing severe economic losses to aquaculture, fisheries and tourism. Of greatest concern to human society are blooms of toxic HAB species that cause illness and death of fish, seabirds and mammals via toxins transferred through the food web. Unprecedented Alexandrium (Dinophyceae) blooms along the East Coast of Tasmania in 2012 and 2015, a previously low biotoxin risk area, led to major impacts on the local oyster, mussel, scallop and rock lobster industries. Four human hospitalisations also occurred from eating wild shellfish.
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Song, Jung-Hun, i Bo-Gyeong Park. "A Study on the Importance-Satisfaction Analysis of Consignment Sale Factors of Fisheries Cooperatives -A Case of the Oyster Hanging Fisheries Cooperatives-". Journal of Fisheries and Marine Sciences Education 26, nr 2 (30.04.2014): 322–34. http://dx.doi.org/10.13000/jfmse.2014.26.2.322.
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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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Sweat, L. Holly, Sidney J. Busch, Casey A. Craig, Emily Dark, Tess Sailor-Tynes, Jessy Wayles, Paul E. Sacks i Linda J. Walters. "Oyster Reefs Are Reservoirs for Potential Pathogens in a Highly Disturbed Subtropical Estuary". Environments 10, nr 12 (27.11.2023): 205. http://dx.doi.org/10.3390/environments10120205.
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Estuaries worldwide are grappling with deteriorating water quality and benthic conditions that coincide with the rising detection of pathogenic and potentially pathogenic microbes (PPM). Both indigenous PPM and those that enter estuaries through urban and agricultural runoff are funneled through suspension-feeding organisms and deposited onto the benthos, where they can be moved through food webs. This study explored PPM communities in the Indian River Lagoon system, a biodiverse but urbanized estuary in east central Florida (USA). PPM were surveyed in estuary water, at stormwater outfalls, and in biodeposits of a key suspension feeder, the eastern oyster Crassostrea virginica. A total of 52 microbial exact sequence variants, with per-sample relative abundances up to 61.4%, were identified as PPM. The biodeposits contained relatively more abundant and diverse PPM than the water samples. PPM community composition also differed between seasons and between biodeposits and water. The community differences were driven primarily by Vibrio and Pseudoalteromonas spp. This investigation provides evidence that, through biodeposition, oyster reefs in the IRL estuary are a reservoir for PPM, and it documents some taxa of concern that should be conclusively identified and investigated for their pathogenicity and potential to pervade food webs and fisheries.
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Rustam, Muhammad Reza. "Oyster Cultivation Betting on Foreign Workers: A Study of Indonesian Workers in Hiroshima". IZUMI 10, nr 1 (11.05.2021): 131–42. http://dx.doi.org/10.14710/izumi.10.1.144-155.
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One of the reasons foreign workers are looking for jobs abroad is that there are not enough jobs in their home countries. Indonesia is one of the countries that send migrant workers to more developed Asian and Middle Eastern countries. The increasingly rapid flow of globalization in the world goes together with the need for new workers to fill the industry, especially in Japan. This condition has forced Japan to open doors for foreign workers from developing countries to satisfy demand. These workers usually come from developing countries, such as Indonesia, Vietnam, China, the Philippines, and others. In general, they occupy the less desirable working positions over Japanese youth, the so-called 3D work (dirty, dangerous, and demanding). Therefore, the current dynamics of these migrant workers' life in Japan becomes an exciting subject to comprehend, especially for the Indonesian migrant workers. This study aims to determine the dynamics of Indonesian worker's life while working in the Japanese fisheries sector. In particular, the study looks at those who work in oyster cultivation in Hiroshima prefecture. This research was carried out using descriptive analysis methods and field study with in-depth interviews conducted from 2016-2018. The interviews performed in this study were structured to find answers for the following questions: What problems do the workers face while living in Japan? What kind of processes did they go through before coming to Japan? While working in the Japanese fishing industry, how was their life as a Muslim minority?
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Rustam, Muhammad Reza. "Oyster Cultivation Betting on Foreign Workers: A Study of Indonesian Workers in Hiroshima". IZUMI 10, nr 1 (11.05.2021): 131–42. http://dx.doi.org/10.14710/izumi.10.1.131-142.
Pełny tekst źródłaStreszczenie:
One of the reasons foreign workers are looking for jobs abroad is that there are not enough jobs in their home countries. Indonesia is one of the countries that send migrant workers to more developed Asian and Middle Eastern countries. The increasingly rapid flow of globalization in the world goes together with the need for new workers to fill the industry, especially in Japan. This condition has forced Japan to open doors for foreign workers from developing countries to satisfy demand. These workers usually come from developing countries, such as Indonesia, Vietnam, China, the Philippines, and others. In general, they occupy the less desirable working positions over Japanese youth, the so-called 3D work (dirty, dangerous, and demanding). Therefore, the current dynamics of these migrant workers' life in Japan becomes an exciting subject to comprehend, especially for the Indonesian migrant workers. This study aims to determine the dynamics of Indonesian worker's life while working in the Japanese fisheries sector. In particular, the study looks at those who work in oyster cultivation in Hiroshima prefecture. This research was carried out using descriptive analysis methods and field study with in-depth interviews conducted from 2016-2018. The interviews performed in this study were structured to find answers for the following questions: What problems do the workers face while living in Japan? What kind of processes did they go through before coming to Japan? While working in the Japanese fishing industry, how was their life as a Muslim minority?
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Ishikawa, Momoko, i Victor S. Kennedy. "Management of the Oyster Fisheries in Japan's Ariake Sea and Maryland's Chesapeake Bay: A Comparison". Marine Fisheries Review 76, nr 3 (16.01.2015): 39–49. http://dx.doi.org/10.7755/mfr.76.3.2.
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Toft, J. E., J. L. Burke, M. P. Carey, C. K. Kim, M. Marsik, D. A. Sutherland, K. K. Arkema i in. "From mountains to sound: modelling the sensitivity of Dungeness crab and Pacific oyster to land–sea interactions in Hood Canal, WA". ICES Journal of Marine Science 71, nr 3 (22.05.2013): 725–38. http://dx.doi.org/10.1093/icesjms/fst072.
Pełny tekst źródłaStreszczenie:
Abstract Many diagnoses of declining marine species and habitats along US coasts point to upland and freshwater sources of imperilment. Yet, little work has examined how and whether activities on land affect marine resources. Similarly, the impacts of climate change on coastal systems are among the most certain; yet, few studies have explored how alternative management and climate scenarios will affect the delivery of diverse benefits to people from coasts. We estimated how Dungeness crab (Metacarcinus magister) and Pacific oyster (Crassostrea gigas) harvest in Hood Canal, WA, may change given predictions of land uses and effects of climate change. These two marine species are critical components of local commercial and recreational fisheries and thus represent key “ecosystem service” endpoints. We found that Dungeness crab harvest responds strongly to effects of climate change, as mediated by increased ocean temperature, whereas Pacific oyster harvest is more responsive to projected change in land-use/land-cover due to increased nutrient loading to the marine system. These changes vary spatially throughout Hood Canal. These results can be used as a heuristic framework to help decision-makers, planners, and other stakeholders in the region as they work to target conservation and restoration activities and plan for future growth in a changing climate.
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Walton, Mark E. M., Jamie Hayes, Mohsin Al-Ansi, Mohamed Abdallah, Ibrahim Al Maslamani, Mohammed Al-Mohannadi, Ismail Al-Shaikh i in. "Towards spatial management of fisheries in the Gulf: benthic diversity, habitat and fish distributions from Qatari waters". ICES Journal of Marine Science 75, nr 1 (27.07.2017): 178–89. http://dx.doi.org/10.1093/icesjms/fsx116.
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Abstract As with many other regions in the world, more complete information on the distribution of marine habitats in the Gulf is required to inform environmental policy, and spatial management of fisheries resources will require better understanding of the relationships between habitat and fish communities. Towed cameras and sediment grabs were used to investigate benthic habitats and associated epifauna, infauna and fish communities in the central Gulf, offshore from the east coast of Qatar, in water depths of between 12 and 52 m. Six different habitats were identified: (i) soft sediment habitats of mud and (ii) sand, and structured habitats of (iii) macro-algal reef, (iv) coral reef, (v) mixed reef, and (vi) oyster bed. The epibenthic community assemblage of the mud habitat was significantly different to that of sand, which in turn differed from the structured habitats of coral reef, mixed reef and oyster bed, with the macroalgal assemblage having similarities to both sand and the other structured habitats. Fish assemblages derived from video data did not differ between habitats, although certain species were only associated with particular habitats. Epibenthic diversity indices were significantly lower in mud, sand and macro-algal habitats, with no differences recorded for fish diversity. Soft sediment grab samples indicated that mud habitats had the highest benthic diversity, with Shannon-Weiner values of >4, and were more diverse than sand with values of 3.3. The study demonstrates high biodiversity in benthic habitats in the central and southwestern Gulf, which may in part be due to the absence of trawling activity in Qatari waters. There is a strong influence of depth on benthic habitat type, so that depth can be used to predict habitat distribution with a high level of accuracy. The presence of outcrops of hard substrata creates a mosaic of patchy shallow structured benthic habitat across extensive areas of the offshore seabed. Such heterogeneity, and the association of commercially exploited fish species with specific habitats, indicates that this region is well suited to a spatial approach to fisheries management.
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Jansen, Alex. "Shell middens and human technologies as a historical baseline for the Chesapeake Bay, USA". North American Archaeologist 39, nr 1 (styczeń 2018): 25–50. http://dx.doi.org/10.1177/0197693117753333.
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The Chesapeake Bay has an archaeological record that dates from the Paleoindian period to the early 20th century. In this paper, the research and analysis of artifact technologies recovered from six radiocarbon (14C) dated shell middens located at the Smithsonian Environmental Research Center in Maryland is provided. This paper demonstrates the ways in which the use of artifact analysis and 14C dating can provide information on human use of coastal resources, settlement-subsistence patterns, and serve as a tool to document sites threatened by coastal processes. Furthermore, this work demonstrates the ways in which the analysis of technologies from shell midden sites can be used to help guide contemporary oyster and other fisheries and natural resources management, restoration, conservation, and sustainability issues in the Chesapeake and other coastal areas.
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Turner, Andrew D., Adam M. Lewis, Wade A. Rourke, Wendy A. Higman, Z. Amzil, M. Andjelkovic, M. B. Miranda i in. "Interlaboratory Comparison of Two AOAC Liquid Chromatographic Fluorescence Detection Methods for Paralytic Shellfish Toxin Analysis through Characterization of an Oyster Reference Material". Journal of AOAC INTERNATIONAL 97, nr 2 (1.03.2014): 380–90. http://dx.doi.org/10.5740/jaoacint.sgeturner.
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Abstract An interlaboratory ring trial was designed and conducted by the Centre for Environment, Fisheries, and Aquaculture Science to investigate a range of issues affecting the analysis of a candidate Pacific oyster paralytic shellfish toxin reference material. A total of 21 laboratories participated in the study and supplied results using one or more of three instrumental methods, specifically precolumn oxidation (Pre-COX) LC with fluorescence detection (FLD; AOAC Official Method 2005.06), postcolumn oxidation (PCOX) LC-FLD (AOAC Official Method 2011.02), and hydrophilic interaction LC/MS/MS. Each participant analyzed nine replicate samples of the oyster tissue in three separate batches of three samples over a period of time longer than 1 week. Results were reported in a standardized format, reporting both individual toxin concentrations andtotal sample toxicity. Data were assessed to determine the equivalency of the two AOAC LC methods and the LC/MS/MS method as well as an assessment of intrabatch and interbatch repeatability and interlaboratory reproducibility of each method. Differences among the results reported using the three methods were shown to be statistically significant, although visualcomparisons showed an overlap between results generated by the majority of tests, the exception being the Pre-COX quantitation of N-hydroxylated toxins in post ion-exchange fractions. Intralaboratory repeatability and interlaboratory reproducibility were acceptable for most of the results, withthe exception of results generated from fractions. The results provided good evidence for the acceptableperformance of the PCOX method for the quantitation of C toxins. Overall the study showed the usefulnessof interlaboratory analysis for the characterizationof paralytic shellfish poisoning matrix reference materials, highlighting some issues that may need to be addressed with further method assessment at individual participant laboratories.
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Handayani, Lia, i Faisal Syahputra. "Perbandingan frekuensi molting Lobster air tawar (Cherax quadricarinatus) yang diberi pakan komersil dan nanokalsium yang berasal dari cangkang tiram (Crassostrea gigas)". Depik 7, nr 1 (17.01.2018): 42–46. http://dx.doi.org/10.13170/depik.7.1.8629.
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Oyster shell can be used as alternative calcium source. Utilizing of oyster shell into nano calcium flour can be used to decrease solid waste. The usage of nano calcium flour in feed is important applied as calcium supplements with cherax quadricarinatus. The purpose of this research is to study the effect of nano calcium addition on feeds to increase moulting frequency, survival and growth rate of freshwater lobster. This research has been done during 60 days in fisheries Laboratory, Abulyatama University. Two percents nano calcium addition on feeds gives significant effect on growth rate and very significant effect to moulting frequency of freshwater lobster. Which has moulting frequency 2.71. Where the treatment was not added nano calcium has moulted frequency 1.29. But, nano calcium addition on foods did not affect survival rate.Cangkang tiram dapat digunakan sebagai alternatif sumber kalsium. Pemanfaatan cangkang tiram menjadi serbuk nanokalsium dapat mengurangi limbah padat. Penggunaan serbuk nanokalsium pada pakan penting dilakukan sebagai suplemen kalsium untuk lobster air tawar. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan nanokalsium pada pakan terhadap pertumbuhan, frekuensi molting dan kelangsungan hidup Lobster Air Tawar (LAT). Penelitian ini dilakukan selama 60 hari di laboratorium perikanan, Universitas Abulyatama. Data dianalisa menggunakan uji T (perbandingan) antara lobster yang diberi pakan nanokalsium dan tanpa penambahan nanokalsium. Nanokalsium yang ditambahkan ke dalam pakan sebanyak 2% berpengaruh nyata terhadap pertumbuhan lobster air tawar (thitung ttabel), dan berpengaruh sangat nyata terhadap jumlah molting dengan frekuensi molting 2,71 kali/ekor terhadap lobster yang diberi pakan nano CaO, sedangkan yang diberi pakan komersil hanya 1,29 kali/ekor. Namun, tidak berpengaruh terhadap tingkat kelangsungan hidup (thitung ttabel).
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Baker, Ronald, Dakota Bilbrey, Aaron Bland, Frank D’Alonzo, Hannah Ehrmann, Sharon Havard, Zoe Porter, Sarah Ramsden i Alexandra R. Rodriguez. "Underwater Video as a Tool to Quantify Fish Density in Complex Coastal Habitats". Diversity 14, nr 1 (13.01.2022): 50. http://dx.doi.org/10.3390/d14010050.
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Habitat loss is a serious issue threatening biodiversity across the planet, including coastal habitats that support important fish populations. Many coastal areas have been extensively modified by the construction of infrastructure such as ports, seawalls, docks, and armored shorelines. In addition, habitat restoration and enhancement projects often include constructed breakwaters or reefs. Such infrastructure may have incidental or intended habitat values for fish, yet their physical complexity makes quantitatively sampling these habitats with traditional gears challenging. We used a fleet of unbaited underwater video cameras to quantify fish communities across a variety of constructed and natural habitats in Perdido and Pensacola Bays in the central northern Gulf of Mexico. Between 2019 and 2021, we collected almost 350 replicate 10 min point census videos from rock jetty, seawall, commercial, public, and private docks, artificial reef, restored oyster reef, seagrass, and shallow sandy habitats. We extracted standard metrics of Frequency of Occurrence and MaxN, as well as more recently developed MeanCount for each taxon observed. Using a simple method to measure the visibility range at each sampling site, we calculated the area of the field of view to convert MeanCount to density estimates. Our data revealed abundant fish assemblages on constructed habitats, dominated by important fisheries species, including grey snapper Lutjanus griseus and sheepshead Archosargus probatocephalus. Our analyses suggest that density estimates may be obtained for larger fisheries species under suitable conditions. Although video is limited in more turbid estuarine areas, where conditions allow, it offers a tool to quantify fish communities in structurally complex habitats inaccessible to other quantitative gears.