Academic literature on the topic 'Wild Caught Tuna'
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Journal articles on the topic "Wild Caught Tuna"
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Miletić, Ivana, Gorana Jelić Mrčelić, Merica Slišković, Maja Pavela-Vrančić, Stjepan Orhanović, and Ivona Mladineo. "The influence of feeding on muscle tissues composition in cage reared bluefin tuna (Thunnus thynnus)." Acta Adriatica 60, no. 1 (July 22, 2019): 60–78. http://dx.doi.org/10.32582/aa.60.1.7.
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Capture-based tuna aquaculture rates as one of the most important aquaculture activities in Cro-atia, where juvenile tuna are reared in cages for over a year long period in order to increase substan-tially their weight. The aim of this study was to assess the effect of length and intensity of feeding on biochemical composition (total fat, moisture, dry matter, carbohydrates and protein content) of tuna (Thunnus thynnus) white muscle tissues in newly caught tuna prior to feeding (NCTPF) versus far-med tuna kept in rearing circular cages in the Vela Grska Bay, Adriatic Sea (LAT 43°17’40,6984”N, LONG 016°28’58,4315”E (WGS84)) between 2001 and 2004. Farmed tunas from all cages were fed with the feed consisting of domestic small pelagic fish, or with mixtures containing North Sea herring (Clupea harengus) and Sardina pilchardus, for five months (cage 3), eight months (cage 4) or 21 months (cages 1 and 2). A low content of moisture and high content of dry matter including fat was observed in farmed tuna muscles compared to wild-caught tuna. In farmed tuna muscles, measured moisture was 55.26% in cage 1, 39.95% in cage 2, 54.64% in cage 3 and 49.70% in cage 4. These results are significantly lower than moisture measured in NCTPF (80.36%). Content of dry matter found in farmed tuna muscles also differed greatly between wild tuna (19.64%) and far-med tuna, but also between the cages (44.74% in cage 1, 60.05% in cage 2, 45.36% in cage 3 and 50.30% in cage 4). In NCTPF, muscle tissues total fat encompassed less than 1% of the total body weight, while it reached over 20% of total body mass in farmed fed tuna (20.62% in cage 1, 42.50% in cage 2, 20.97% in cage 3 and 20.57% in cage 4). These results demonstrate that high fat content can be achieved already after five months of intensive feeding. Higher content of proteins was also found in aquacultured tuna (18.60% in cage 1, 16.00% in cage 2, 15.09% in cage 3 and 20.58% in cage 4) compared to wild-caught tuna (13.77%). There were no differences in carbohydrates con-tent between tuna farmed in different cages and NCTPF tuna, indicating glycogen as a less optimal indicator of muscle tissue quality in farmed tuna of the present study.
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Yulisti, Maharani, Rizky Muhartono, and Armen Zulham. "WHY INDONESIA SHOULD DEVELOP TUNA SEA FARMING TO OVERCOME OVERFISHING? A REVIEW OF TWO SIDES ARGUMENT." Buletin Ilmiah Marina Sosial Ekonomi Kelautan dan Perikanan 9, no. 2 (December 30, 2014): 53. http://dx.doi.org/10.15578/marina.v9i2.431.
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Tuna is the mainstay of fisheries export commodities in Indonesia with a total export amounted to 201.159 tons and export value of 750 million dollars in 2012. The high demand tuna improve the practice of tuna captured in the sea, causing a decline in tuna stocks both in the number and size of tuna caught. This condition triggers the experts to culture tuna in laboratory scale to reduce the impact of overexploitation (overfishing). However, the tuna sea farming is under the spotlight because in practice, some countries do tuna farming without hatching of the parent tuna but merely enlarge a baby tuna are caught from the wild to market size. This gives rise to a difference of opinion of many experts on tuna farming practices. Therefore, this article highlights the pros and cons of experts on tuna farming from environmental, economic and technical, to determine whether Indonesia needs to develop tuna farming to cope with overfishing. The method used in this research is the study of literature writings on tuna farming and analyzed descriptively. Results of the analysis showed that despite the many negative opinions about the tuna sea farming, the Indonesian government should support the of tuna sea farming with tuna breeding research, as has been done by the Research Institute for Marine Fisheries Gondol. If the tuna breeding is successful, will have a great impact on the problems of the world tuna demand which increasing every year.
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HATTOUR, A., and W. KOCHED. "Temporal distribution of size and weight of fattened Bluefin tuna (Thunnus thynnus l.) from Tunisian farms: (2005-2010)." Mediterranean Marine Science 15, no. 1 (December 5, 2013): 115. http://dx.doi.org/10.12681/mms.513.
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The present study analysis size and weight-frequency composition of Atlantic bluefin tuna (Thunnus thynnus thynnus) fattened in Tunisian farms for the period 2005-2010 and compare these morphometric parameters with those from wild bluefin tuna landed on 2001 at Sfax port (Tunisia). A total of 6,757 wild and fattened bluefin tuna were measured as straight-line fork length and 49,962 were weighted. Average value of K for wild BFT was 1.59 and respectively 2.43, 2.32, 2.15, 1.61, 1.79 and 1.90 for Fattened BFT after 5-6 months from 2005 to 2010. Length frequency of fattened bluefin showed clearly a substantial increase in juvenile rate. The percentage which was 21.4% in 2005 reached 31.3% in 2009. For weight distribution, 73.3% of the fish caught in 2001 are below the annual mean (75.7 kg), while means 71 to 72% of fattened fish were under annual mean weight. Year 2009 is exceptional because only 57% of fattened fish were under the mean weight. This demonstrates that the fish caught are becoming increasingly small. Mean weight for fattening period (77 to 124 kg) are obviously higher than those of the wild fish (75,7kg).This study showed an increment in the amount of specimen under first sexual maturity which will not have the chance to spawn.
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Annibaldi, Anna, Cristina Truzzi, Oliana Carnevali, Paolo Pignalosa, Martina Api, Giuseppe Scarponi, and Silvia Illuminati. "Determination of Hg in Farmed and Wild Atlantic Bluefin Tuna (Thunnus thynnus L.) Muscle." Molecules 24, no. 7 (April 1, 2019): 1273. http://dx.doi.org/10.3390/molecules24071273.
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Mercury (Hg) is a well-known toxic element, diffused in the environment, especially in the Mediterranean Sea which is rich in cinnabar deposits. Mercury bioaccumulation in fish is of great concern, especially for top-level aquatic predators (e.g., shark, tuna, swordfish) and above all for species of large human consumption and high nutritional value. This work aimed to determine Hg concentrations in farmed and wild Atlantic Bluefin tuna (Thunnus thynnus) caught in the Mediterranean area in order to evaluate the level of Hg bioaccumulation. selenium (Se) content was also determined, since this element is an antagonist of mercury toxicity. Mercury and Se were analysed by atomic absorption spectrometry after microwave digestion of the samples. Hg content in farmed tuna was below the legal limit (1 mg/kg, wet weight, w.w.) for all specimens (0.6 ± 0.2 mg/kg), whereas the wild ones had a content over the limit (1.7 ± 0.6 mg/kg); Se concentration was higher in farmed specimens (1.1 ± 0.9 mg/kg) compared to wild ones (0.6 ± 0.3 mg/kg). A safe seafood could show a Se/Hg ratio >1 and a health benefit value (HBVSe) > 0: farmed tuna had higher values than the wild specimens (Se/Hg 5.48 vs. 1.32; HBVSe 11.16 vs. 0.29). These results demonstrate that for Hg, there is a better risk/benefit ratio in farmed T. thynnus. making it safer than wild tuna.
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Sugihara, Yukitaka, Toshiyuki Yamada, Toshio Ichimaru, Kazuki Matsukura, and Kinya Kanai. "Detection of bluefin tuna blood flukes ( Cardicola spp.) from wild juvenile Pacific bluefin tuna Thunnus orientalis caught for aquaculture." Aquaculture 452 (February 2016): 9–11. http://dx.doi.org/10.1016/j.aquaculture.2015.10.021.
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Mrčelić, Gorana Jelić, Ivana Miletić, Marina Piria, Ambroz Grgičević, and Merica Slišković. "The Peculiarities and Farming Challenges of Atlantic Bluefin Tuna (Thunnus thynnus, L. 1758)." Croatian Journal of Fisheries 78, no. 1 (March 1, 2020): 33–44. http://dx.doi.org/10.2478/cjf-2020-0004.
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AbstractThe aim of this paper is to provide an overview of bluefin tuna, with special regard to its farming challenges. Tuna is one of the most prominent species in fisheries worldwide. The high market value of tuna stocks has led to intensified fishing pressure that resulted in drastic population reductions in every ocean where these fish are found. It is very difficult to obtain the necessary data for the appropriate stock assessment analysis, and there is a very high degree of uncertainty in the models used to evaluate Atlantic bluefin tuna stocks. Tuna-farming could help reduce pressure on the tuna population, but the problem is that the majority of cage-farmed fish is caught in its natural environment (wild population), and thus is fattened or farmed to a certain size. Additionally, the challenges in tuna farming are numerous. Tuna is a fast swimmer, a large energy and oxygen consumer, therefore consuming a large portion of available food to maintain its metabolism. However, due to its delicious taste, high market price and a large demand for this species, pressure will probably continue to grow in the future. Therefore intensive farming, which implies the full breeding cycle in captivity, remains one of the possible solutions that could help reduce the pressure on the tuna population.
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Chambers, Mark S., Leesa A. Sidhu, and Ben O’Neill. "Southern bluefin tuna (Thunnus maccoyii) shed tags at a higher rate in tuna farms than in the open ocean — two-stage tag retention models." Canadian Journal of Fisheries and Aquatic Sciences 71, no. 8 (August 2014): 1220–28. http://dx.doi.org/10.1139/cjfas-2013-0325.
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Tag shedding rates are estimated for southern bluefin tuna (SBT, Thunnus maccoyii) from double-tagging data arising from two tagging studies run in the 1990s and 2000s. Since the early 1990s, a high proportion of SBT tag recoveries has been sourced from juveniles captured by purse seine vessels in the Great Australian Bight and transferred to tuna farms off Port Lincoln in the state of South Australia. When tags have been shed by wild-caught SBT fattened in tuna farms, it is generally not known if the tags were shed in the open ocean before purse seine capture or after purse seine capture while the fish were on farm. Using a Bayesian approach, we fit separate tag retention curves for time in the ocean and time on farms as Weibull distribution reliability functions. The study suggests SBT shed tags at a much higher rate in on-farm enclosures than in the open ocean. Biofouling on tags in tuna farms may contribute to higher tag shedding rates.
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Buller, Nicky. "Diseases of aquaculture." Microbiology Australia 37, no. 3 (2016): 103. http://dx.doi.org/10.1071/ma16035.
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The value of production of aquaculture in Australia is around $990 million1 and consists of cultivation of over 40 species, most for food, but others such as pearl oysters and crocodiles are cultured for products for the fashion industry. A number of finfish are grown for food including salmon, barramundi, and silver perch, and other species include prawns, marron, abalone, oysters and mussels, whereas southern bluefin tuna are caught from the wild and farmed until they reach market size. A number of species are being investigated for aquaculture and these include octopus and sea cucumber.
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MLADINEO, IVONA, and IVANA BOÑINA. "Ceratomyxa thunni sp. n. (Myxozoa: Ceratomyxidae) in Atlantic northern bluefin tuna (Thunnus thynnus) caught in the Adriatic Sea, Island of Jabuka." Zootaxa 1224, no. 1 (June 5, 2006): 59. http://dx.doi.org/10.11646/zootaxa.1224.1.5.
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A new species of coelozoic myxozoan, Ceratomyxa thunni, was isolated from gall bladders of young wild Atlantic northern bluefin tuna (Thunnus thynnus Linnaeus, 1758), caught in the Adriatic Sea, Island of Jabuka (type locality). The prevalence was 23.3 % with low intensity (1–5 spores per microscope field at magnification of 400 x), inducing no pathological changes in the gall bladder epithelium. Light and TEM microscopy of spores revealed that this new species differs from other marine Ceratomyxa in morphology and size; the length of spores is 3.4–4.3 mm, thickness 11.6–15.3 mm and polar capsules 1.3 x 1.6 mm. A distinctive characteristic is densely self-coiled polar filaments. Spores are small, slightly semilunar or elongated with arcuate edges. Early forms are shorter, clubber, thicker, paniform, with slightly convex or blunt edges. Mature spores are slimmer, elongated, concave at the posterior margin, with edges finishing slightly sharper, semilunar in appearance. Bluefin tuna is a new host for this genus.
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Nielsen, Svein Vatsvåg. "From Foragers to Fisher-Farmers: How the Neolithisation Process Affected Coastal Fisheries in Scandinavia." Open Archaeology 8, no. 1 (January 1, 2022): 956–86. http://dx.doi.org/10.1515/opar-2022-0263.
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Abstract The Neolithisation process altered human dependence on wild food sources, and dominant models of the Neolithic transition in Scandinavia still focus on cultural divisions. This study emphasises the evidence of creolization processes, in particular the exploitation of Atlantic Bluefin tuna (Thunnus thynnus) among Neolithic fisher-farmers north and east of the Skagerrak Sea in Scandinavia (4000–2350 cal BCE). The site Jortveit in Southern Norway, where Bluefin tuna was caught with toggling harpoons, is used as a point of departure. In order to understand this phenomenon, the first empirical review of prehistoric toggling harpoons in Central and Eastern Europe is presented. Toggling harpoons first appeared in the late Vinĉa Culture, then in the Gumelniţa, Cucuteni-Trypillia, and Sredny Stog cultural complexes further east, and finally in Central Europe and Scandinavia during the time of the Funnel Beaker Culture. Considering the accumulated evidence of long distance contact from Eastern to Central Europe and Scandinavia in the early fourth millennium BCE, it is argued that toggling harpoon technology was distributed through trade networks. Its appearance around the Skagerrak Sea in the Neolithic reflects fisher-farmers using a creolized fishing technology, inspired by Eneolithic societies.
Book chapters on the topic "Wild Caught Tuna"
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Kiraz, E. Didem Evci. "İklim Değişikliğinin Sağlık Etkilerinin Yükü." In Döngüsel Ekonomi ve Sürdürülebilir Hayat, 339–58. Turkish Academy of Sciences, 2022. http://dx.doi.org/10.53478/tuba.978-605-2249-97-0.ch13.
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The relationship between climate change and health is a real relationship that needs to be relieved of being theoretical by developing a pool of evidence. Health sector will be the most vulnerable sector in climate change. Health promotion and primary health care dimensions increase the sensitivity of the health sector. The shares allocated to these dimensions from the country budgets are less than the other health sector investment shares. When we add equity to the principle of equality, it is imperative that the health sector meet the socio-economic burden of climate change. For this reason, the health sector is as strong as its weakest point and seems doomed to be caught unprepared for the worst-case scenario. The disease burden formula, which is built only on the number of those who died and sick due to the effects of climate change, prevents seeing the holistic economic picture. For climate change, a “health burden” calculation should be made, which includes the disease burden (individual / social disease cost), the individual burden of health personnel, the burden of health services, the cost of pressure on the health sector of other sectors, mitigation, and adaptation costs. Climate change should be reflected in health burden calculations as a multiplier effect. Adaptation should be prioritized in climate change health burden calculations and advanced analyzes. Leaders of the new era will be leaders who have a public health perspective and increase public awareness, that the public is responsible for their own health, and take the lead in increasing conscious health promotion efforts. Leaders should allocate money to each future dream from the budget.
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Colby, Jason M. "New Frontiers." In Orca. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190673093.003.0021.
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Skana looked sick. On September 18, 1980, she failed to finish her show, and the next day she remained sluggish. Murray Newman and his staff were concerned. Along with Hyak II (formerly Tung-Jen), she was the Vancouver Aquarium’s biggest draw. In the thirteen years since Ted Griffin had captured her, Skana had been the star of Stanley Park, giving millions their first close-up view of a killer whale. And through her impact on Paul Spong and Greenpeace, she had helped reframe the international whaling debate. She may well have been the most influential cetacean in history, but she grew weaker each day, and despite heavy doses of antibiotics, she succumbed on Sunday, October 5. The necropsy revealed a fungal infection in her reproductive tract. Although aquarium officials were correct in noting that she had lived longer in captivity than any other killer whale, she was still young—no more than twenty. She might have lived fifty more years in the wild. Skana’s death left Hyak alone. He had come from Pender Harbour in 1968 as a small, frightened calf, and now he was a sexually mature male in need of a mate. Yet the acquisition of killer whales was no simple matter. The Department of Fisheries had stated that it would allow wild capture to replace orcas who died in captivity, but the Vancouver Aquarium hadn’t caught a killer whale since Moby Doll in 1964, and if it tried now, activists would surely oppose it. “I knew it would be unpopular for us to try to capture a live killer whale locally and felt a little frustrated about it,” Newman admitted. “To my mind, the entire awareness of the killer whales’ right to live was brought about by aquariums exhibiting these animals.” With nearby waters out of play, he looked to Iceland, which had become the primary source of captive orcas in recent years. After receiving the Canadian government’s permission to import whales, Newman boarded a plane for Iceland, arriving at Keflavik International Airport in the early morning of December 13, 1980.
Conference papers on the topic "Wild Caught Tuna"
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Capponi, Stefano, and Chiazor Nwachukwu. "Data Analytics Software for Automatic Detection of Anomalies in Well Testing." In SPE Offshore Europe Conference & Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205456-ms.
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Abstract This paper will present a software that was developed to diagnose well test data. The software monitors the data, and through a series of algorithms alarms the user in case of discrepancies. This allows the user to investigate possible source of errors and correct them in real time. Several datasets from previous operations were analyzed and the basic physics governing how a certain datum depends on others were laid out. All the well test data traditionally acquired were put on a matrix, showing the dependencies between each datum and other physical properties that are available - either measured or modelled. Acceptable fluctuations in acquired data were also identified for use as tolerance limits. The software scans through the data as it is acquired and raises an alarm when the identified dependencies are broken. The software also identified which parameter is most likely causing the error. The software was built based on previous well test data and reports. Subsequently, two field trials were conducted to fine tune the algorithms and allowable data fluctuations. The process of validating the software consisted of: (1) Identifying flagged errors that should have not been flagged (dependencies set too tight); (2) identifying errors that should have been flagged and were not (dependencies set too loose); (3) improving the user interface for ease of use. The results were positive, with several improvements in the error recognition and several discrepancies flagged that would not have been caught by the naked eye. The user interface was also improved, allowing the user to clear error messages and provide input to improve the algorithm. The field trial also demonstrated that the methodology is scalable to other data acquisition plans and to more advanced analytics. The algorithms are simple, allowing the software to be implemented in all operations. More advanced algorithms are likely to depend on job specific data and parameters. Traditional data acquisition systems used during well test only present the data. Alarms trigger the user's attention only when certain defined operability limits are about to be reached. Being able to confirm that the data is cohesive during the well test prevents a loss of confidence in the results and painful post processing exercises. Moreover, given the algorithms used are based on simple physics, it is easy to deploy the software in any operation.