Letteratura scientifica selezionata sul tema "Drifting Fish Aggregating Devices"
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Articoli di riviste sul tema "Drifting Fish Aggregating Devices":
1
Hanich, Quentin, Ruth Davis, Glen Holmes, Elizabeth-Rose Amidjogbe e Brooke Campbell. "Drifting Fish Aggregating Devices (FADs)". International Journal of Marine and Coastal Law 34, n. 4 (4 novembre 2019): 731–54. http://dx.doi.org/10.1163/15718085-23441103.
Abstract (sommario):
AbstractThis article describes the proliferation of drifting fish aggregating devices (FADs) and analyses subsequent legal questions that arise for fisheries and marine litter management over who is responsible for FADs during their drifting stage. This follows recent concerns about unlicensed FADs drifting through closed areas. This article analyses a case study of the Western and Central Pacific Fisheries Commission (WCPFC) in order to determine State obligations to manage drifting FADs. Analysis concludes that a drifting FAD in the WCPFC Area is ‘fishing’ from deployment to recovery, thereby creating obligations to monitor, control and report drifting FADs, consistent with broader obligations for coastal and flag States. The article recommends strengthening regional management in three ways: implement regional drifting FAD monitoring systems; control deployment of drifting FADs so as to promote recovery and minimize lost gear; and define appropriate responses for FADs that drift into national or closed waters without a license.
2
Trygonis, Vasilis, Stratis Georgakarakos, Laurent Dagorn e Patrice Brehmer. "Spatiotemporal distribution of fish schools around drifting fish aggregating devices". Fisheries Research 177 (maggio 2016): 39–49. http://dx.doi.org/10.1016/j.fishres.2016.01.013.
3
Zhang, Tongzheng, Zhiqiang Liu, Junbo Zhang, Xing Su, Junlin Chen e Rong Wan. "Numerical Study of the Hydrodynamic Response of Biodegradable Drifting Fish Aggregating Devices in Regular Waves". Fishes 9, n. 4 (22 marzo 2024): 112. http://dx.doi.org/10.3390/fishes9040112.
Abstract (sommario):
Fish-aggregating devices play a significant role in tuna purse fisheries. The severe marine environment and the large number of non-biodegradable fish-aggregating devices impact structural safety and cause marine litter. Therefore, hydrodynamic performance and the use of biodegradable materials are crucial issues for ensuring the sustainability of fish-aggregating devices. In this study, a type of virtual biodegradable drifting fish-aggregating device (Bio-DFAD) was designed. Numerical simulations were conducted to investigate the motion responses and relative velocities of Bio-DFADs in regular waves (first- and fifth-order waves). The numerical model was applied based on unsteady Reynolds-averaged Navier–Stokes equations with the realizable k–ε model. For different scenarios of modeling, various conditions were modeled, including the relative length, wave steepness, and diameter of the balsa wood, to analyze their effects on the hydrodynamic response of the Bio-DFADs. The results indicated that the increased relative length, wave steepness, and diameter of balsa wood had a significant influence on the motion response amplitude operators (RAOs) and relative velocity of Bio-DFADs. The results suggested that a relative length (LF/B = 1.5) and smaller diameter (DF = 30 mm) were recommended for fewer motion responses and relative velocity. The obtained results provide insight for practical engineering applications of the hydrodynamic design of Bio-DFADs.
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Zudaire, Iker, Gala Moreno, Jefferson Murua, Paul Hamer, Hilario Murua, Mariana T. Tolotti, Marlon Roman et al. "Biodegradable drifting fish aggregating devices: Current status and future prospects". Marine Policy 153 (luglio 2023): 105659. http://dx.doi.org/10.1016/j.marpol.2023.105659.
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Moreno, Gala, Erwan Josse, Patrice Brehmer e Leif Nøttestad. "Echotrace classification and spatial distribution of pelagic fish aggregations around drifting fish aggregating devices (DFAD)". Aquatic Living Resources 20, n. 4 (ottobre 2007): 343–56. http://dx.doi.org/10.1051/alr:2008015.
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Moreno, Gala, Laurent Dagorn, Gorka Sancho e David Itano. "Fish behaviour from fishers’ knowledge: the case study of tropical tuna around drifting fish aggregating devices (DFADs)". Canadian Journal of Fisheries and Aquatic Sciences 64, n. 11 (1 novembre 2007): 1517–28. http://dx.doi.org/10.1139/f07-113.
Abstract (sommario):
Purse-seining for tropical tuna is one of the most technologically advanced fisheries in the world. The purpose of this study was to apply local ecological knowledge (LEK) to assist in the planning of future in situ studies of fish behaviour around drifting fish aggregating devices (DFADs) by prioritizing research topics, thereby reducing the number of potential hypotheses to explore. Interviews of fishing masters of the purse-seine fleets working in the western Indian Ocean provided an alternate, independent, and previously unexplored source of behavioural information, specifically on the attraction, retention, and departure behaviours of tuna schools in relation to DFADs. Most fishing masters agreed that the maximum attraction distance of a DFAD is approximately 10 km and generally agreed to the following statements. Tuna form distinct schools under FADs, commonly segregated by species and size. The main reasons for the departure of tuna aggregations from FADs are changes in currents or FAD movements and location in relation to physical or oceanographic features. The number of actively monitored DFADs at sea in the western Indian Ocean was estimated at approximately 2100. Incorporating fishers into the planning and design stages of future research projects will facilitate collaborative and integrated approaches.
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Capello, Manuela, Gorka Merino, Mariana Tolotti, Hilario Murua e Laurent Dagorn. "Developing a science-based framework for the management of drifting Fish Aggregating Devices". Marine Policy 153 (luglio 2023): 105657. http://dx.doi.org/10.1016/j.marpol.2023.105657.
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Brehmer, Patrice, Erwan Josse e Leif Nøttestad. "Evidence that whales (Balaenoptera borealis) visit drifting fish aggregating devices: do their presence affect the processes underlying fish aggregation?" Marine Ecology 33, n. 2 (5 agosto 2011): 176–82. http://dx.doi.org/10.1111/j.1439-0485.2011.00478.x.
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Baidai, Yannick, Jon Uranga, Maitane Grande, Hilario Murua, Josu Santiago, Iñaki Quincoces, Guillermo Boyra, Blanca Orue, Laurent Floch e Manuela Capello. "A standard processing framework for the location data of satellite-linked buoys on drifting fish aggregating devices". Aquatic Living Resources 35 (2022): 13. http://dx.doi.org/10.1051/alr/2022013.
Abstract (sommario):
Satellite-linked buoys used by tropical tuna purse-seine vessels on drifting fish aggregating devices (DFADs) provide a continuous stream of information on both the ocean characteristics and the presence and size of fish aggregations associated with DFADs, enabling the study of pelagic communities. This unprecedented amount of data is characterized by ocean-scale coverage with high spatial and temporal resolutions, but also by different data formats and specifications depending on buoy model and brand, as well as on the type of data exchange agreements into play. Their use for scientific and management purposes is therefore critically dependent on the abilities of algorithms to process heterogeneous data formats and resolutions. This paper proposes a unified set of algorithms for processing the buoys location data used by the two major purse seine fleets operating in the Atlantic and Indian oceans. Three main issues that need to be addressed prior to the exploitation of the data are identified (structural errors, data records on land and on-board vessels) and five specific filtering criteria are proposed to improve the data cleaning process and, hence, quality. Different filtering procedures are also compared, and their advantages and limitations are discussed.
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Baidai, Y., L. Dagorn, M. J. Amande, D. Gaertner e M. Capello. "Machine learning for characterizing tropical tuna aggregations under Drifting Fish Aggregating Devices (DFADs) from commercial echosounder buoys data". Fisheries Research 229 (settembre 2020): 105613. http://dx.doi.org/10.1016/j.fishres.2020.105613.
Tesi sul tema "Drifting Fish Aggregating Devices":
1
Maufroy, Alexandra. "Drifting Fish Aggregating Devices of the Atlantic and Indian Oceans : modalities of use, fishing efficiency and potential management". Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT150/document.
Abstract (sommario):
Depuis le milieu des années 1990, l’utilisation de Dispositifs de Concentration de Poissons (DCP), des objets artificiels spécifiquement mis à l’eau pour agréger des bancs de poissons, est devenue de plus en plus importante pour la pêche au thon tropical à la senne. Cette utilisation massive des DCP, qui s’accompagne d’une utilisation massive de dispositifs de suivi comme les balises GPS et les balises échosondeurs, est aujourd’hui source d’inquiétude pour les stocks de thons, les prises accessoires mais aussi pour le fonctionnement des écosystèmes pélagiques. Cependant, les modalités d’utilisation des DCP et des balises GPS qui servent à les suivre restent mal connues, ce qui complique considérablement l’évaluation et la gestion des impacts de ces pratiques de pêche. Afin d’améliorer les connaissances actuelles de la pêcherie, les positions des balises GPS utilisées par les 3 armements français dans les océans Atlantique et Indien, constituant une part significative des DCP utilisés dans ces deux océans, ont été analysées. Ces données ont été combinées avec des multiples sources d’information : les livres de bord, les trajectoires VMS des senneurs français ainsi que des entretiens avec les patrons français. Elles nous permettent de mieux comprendre les stratégies de mise à l’eau des DCP et des balises, d’estimer le nombre d’objets flottants utilisés par les flottes de senneurs dans les océans Atlantique et Indien, de mesurer la contribution des DCP et des navires auxiliaires à l’efficacité de pêche des senneurs, d’identifier des destructions potentielles d’habitats par les DCP échoués and pour finir de proposer des solutions de gestion pour la pêcherie. Les résultats montrent une grande saisonnalité dans les mises à l’eau des deux océans, une croissance rapide du nombre de balises GPS au cours des 7 dernières années puisqu’elle est multipliée par 4.2 dans l’Océan Indien et 7 dans l’Océan Atlantique, des dommages possibles causés à des écosystèmes côtiers fragiles avec une probabilité d’échouage de l’ordre de 10% et finalement une augmentation de l’efficacité de pêche entre 2003 et 2014 de l’ordre de 3.8-18.8% dans l’Océan Atlantique et 10.7%-26.3% dans l’Océan Indien. Les entretiens avec les capitaines des senneurs soulignent la nécessité d’une gestion plus efficace de la pêcherie, avec entre autres l’instauration de quotas, une régulation de la capacité de la flotte de senneurs et un meilleur suivi des navires auxiliaires. Les résultats obtenus constituent les premières étapes nécessaires à une meilleure gestion de la pêche sous objet flottantSince the mid 1990s, the use of drifting Fish Aggregating Devices (dFADs) by purse seiners, artificial objects specifically designed to aggregate fish, has become an important mean of catching tropical tunas. In recent years, the massive deployments of dFADs, as well as the massive use of tracking devices on dFADs and natural floating objects, such as GPS buoys, have raised serious concerns for tropical tuna stocks, bycatch species and pelagic ecosystem functioning. Despite these concerns, relatively little is known about the modalities of GPS buoy tracked objects use, making it difficult to assess and manage of the impacts of this fishing practice. To fill these knowledge gaps, we have analyzed GPS buoy tracks provided by the three French fishing companies operating in the Atlantic and the Indian Oceans, representing a large proportion of the floating objects monitored by the French fleet. These data were combined with multiple sources of information: logbook data, Vessel Monitoring System (VMS) tracks of French purse seiners, information on support vessels and Local Ecological Knowledge (LEK) of purse seine skippers to describe GPS buoy deployment strategies, estimate the total number of GPS buoy equipped dFADs used in the Atlantic and Indian Oceans, measure the contribution of strategies with FOBs and support vessels to the fishing efficiency of tropical tuna purse seiners, identify potential damages caused by lost dFADs and finally to propose management options for tropical tuna purse seine FOB fisheries. Results indicate clear seasonal patterns of GPS buoy deployment in the two oceans, a rapid expansion in the use of dFADs over the last 7 years with an increase of 4.2 times in the Indian Ocean and 7.0 times in the Atlantic Ocean, possible damages to fragile coastal ecosystems with 10% of GPS buoy tracks ending with a beaching event and an increased efficiency of tropical tuna purse seine fleets from 3.9% to 18.8% in the Atlantic Ocean over 2003-2014 and from 10.7% to 26.3% in the Indian Ocean. Interviews with purse seine skippers underlined the need for a more efficient management of the fishery, including the implementation of catch quotas, a limitation of the capacity of purse seine fleets and a regulation of the use of support vessels. These results represent a first step towards better assessment and management of purse seine FOB fisheries
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Snouck-Hurgronje, Julia. "The Effects of Drifting Fish Aggregating Devices on Bycatch in the Tropical Tuna Purse Seine Fisheries in the Atlantic and Indian Oceans". W&M ScholarWorks, 2016. https://scholarworks.wm.edu/etd/1499449678.
Abstract (sommario):
Thousands of floating objects, known as drifting fish aggregating devices (dFADs), are released every year by commercial tropical tuna purse seine vessels in the three equatorial oceans to aggregate tuna and increase catch. The escalation in the number of dFADs deployed over the last three decades has caused changes in fishing effort that are poorly reflected in traditional indices of purse seine effort and catch per unit of effort (CPUE). In addition, concerns have been raised regarding the impacts of such high numbers of dFADs being deployed on both catch and bycatch species. I studied two aspects of dFAD deployments in order to clarify how dFADs are used by purse seiners and how they affect the magnitude of bycatch. My specific goals were to determine how often purse seine vessels fish on the dFADs they deploy and how regional dFAD density affects the magnitude of bycatch and catch. I analyzed commercial data, independent observer data, satellite buoy trajectories, and estimated floating object densities from the French tropical tuna purse seine fisheries in the Atlantic and Indian Oceans to examine these relationships. My results indicate that only 2.7-20.6% of dFAD fishing sets were on the dFADs that French purse seiners deployed over the period 2007-2013. Although this percentage increased over time, such a low percentage suggests that French vessels do not primarily increase CPUE by using the dFADs they deploy for directed fishing. If French purse seiners are not mainly using their own dFADs in this manner, then using a metric of nominal effort based on individual vessel activity is unlikely to produce reliable CPUE estimates for the fishery. While information about how often purse seiners fish on their own dFADs could be incorporated into indices of fishing effort, it may be just as important, if not more so, to quantify the collective component of dFAD releases for overall fishing effort. The results for the second objective showed that average dFAD density had a relatively weak relationship with total bycatch biomass. There was no statistically significant effect on mean total bycatch biomass, but dFAD density was related to heteroscedasticity in bycatch biomass. In particular, there was a significant negative relationship between dFAD density and the upper quantiles of the bycatch biomass distribution, suggesting that dFAD density determines the upper bound for bycatch biomass caught per set. These relationships were not constant across species, however, as the five most prevalent bycatch species (i.e., those caught in the greatest number of sets) showed a mix of positive, negative, or no relationships to dFAD density. The total biomass of catch increased significantly as average dFAD density increased both at the mean and throughout the majority of the distribution, although this effect only explained a small fraction of the total variance in catch biomass. at this time, the low amount of variance explained and the inconsistent impact of average dFAD density on bycatch and target species indicate that it would be ineffective to mitigate bycatch levels in these fisheries by attempting to control regional dFAD densities.
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Dupaix, Amaël. "Impacts des modifications de l'habitat pélagique sur le comportement et la condition physiologique des thons tropicaux". Electronic Thesis or Diss., Université de Montpellier (2022-....), 2023. http://www.theses.fr/2023UMONG027.
Abstract (sommario):
Les thons tropicaux, comme d’autres poissons pélagiques, s’associent aux objets flottants. Si ce comportement associatif est connu depuis près de deux millénaires, les raisons sous-jacentes sont encore méconnues. Les pêcheurs exploitent ce comportement associatif pour faciliter la recherche et la capture de poissons. Dans les années 1980, les pêcheurs industriels ont commencé à construire et à déployer leurs propres objets flottants artificiels, les dispositifs de concentration de poissons dérivants (DCPd). Depuis, le déploiement des DCPd a augmenté drastiquement, ce qui a plusieurs impacts écologiques sur les thons tropicaux. Les DCPd ont de nombreux impacts directs (liés à la mortalité par pêche) : ils augmentent l’efficacité des senneurs, modifient la composition spécifique des captures et augmentent les captures de petits albacores (Thunnus albacares) et thons obèses (Thunnus obesus). Outre ces impacts directs, les DCPd pourraient avoir des impacts indirects sur les thons tropicaux de par leur seule présence. Cette thèse vise à (1) faire le point sur les impacts indirects des DCPd, (2) quantifier les modifications induites par les DCPd et d’autres activités anthropiques sur l’habitat, et (3) caractériser les impacts directs et indirects de ces modifications en considérant le comportement et la condition physiologique des thons tropicaux.Une revue de littérature a permis de montrer que les DCPd modifient l’habitat des thons tropicaux, mais que les quantifications manquent. Il n’existe pas de résultats scientifiques convergeants concernant les impacts indirects des DCPd sur le comportement et la biologie des thons tropicaux (Chapitre 2). Dans l’ouest de l’océan Indien, les DCPd représentent 85 % des objets flottants, augmentant ainsi fortement leur densité (Chapitre 3). Les autres activités humaines (e.g. déforestation, changement climatique) n’ont pas induit de tendance claire de la densité des objets flottants naturels, suggèrant que les DCPd sont le principal moteur des modifications de l’habitat des thons tropicaux (Chapitre 4). Grâce à un modèle de comportement de thons, nous avons pu estimer que l’augmentation de la densité des DCPd a fortement augmenté le pourcentage de temps que les individus passent associés aux DCPd, de 20 % à 68 % dans l’ouest de l’océan Indien (Chapitre 5). Elle a aussi un impact sur le comportement associatif des agrégations de thons (Chapitre 6). Les DCPd ont donc un impact direct, en augmentant le temps que les thons passent associés et ainsi leur capturabilité par les thoniers senneurs. Une analyse de données taille poids d’albacores sur plus de vingt ans montre que l’augmentation de la densité d’objets flottants induite par les DCPd ne se traduit pas par un impact à long terme sur leur condition dans l’océan Indien (Chapitre 7). Il faut donc poursuivre les recherches sur le lien de causalité entre l’association des thons avec les DCPd et leur faible condition, qui peut être testé à l’aide du modèle développé au Chapitre 8.Le travail développé dans cette thèse a permis d’améliorer notre compréhension des impacts des DCPd sur les thons tropicaux, ce qui a plusieurs implications en termes de gestion. D’autres travaux expérimentaux et de terrain sont nécessaires pour explorer ces impacts potentiels et des séries temporelles d’indicateurs à long terme devraient être récoltées pour les évaluer. Comme les impacts indirects des DCPd peuvent agir comme facteurs aggravants sur les populations de thons, il est urgent de les caractériser. En outre, cette thèse apporte de nouveaux élements sur les raisons sous-jacentes au comportement associatif des thons et sur les impacts des DCPd qui en résultent. Dans l’Océan Indien, la situation des populations de thons est alarmante, l’albacore et le thon obèse étant surexploités. Les résultats de cette thèse peuvent aider à un meilleur diagnostic de l’impact des DCP sur les thons tropicaux et ainsi contribuer à une meilleure gestion de cette resource communeTropical tunas, as many pelagic fish species are known to associate with floating objects (FOBs). If this associative behavior has been known for almost 2 millennia, the reasons underlying it are still largely unknown. Fishers exploit this associative behavior to facilitate the search and catch of fish. In particular, in the 1980s, industrial fishers began to build and deploy their own man-made floating objects, drifting fish aggregating devices (DFADs). Since then, the deployment of DFADs has increased massively, which has several ecological impacts, on the environment and directly on marine species. This thesis focuses on DFADs ecological impacts on tropical tuna. DFADs impact tropical tuna directly by increasing purse seine fleets’ efficiency, yield and by expanding their fishing grounds. They also change species catch composition and increase the catch of small yellowfin (Thunnus albacares) and bigeye (Thunnus obesus) tunas. Besides these direct impacts (related with fishing mortality), DFADs could impact tropical tunas indirectly by their sole presence in the ocean. This thesis aims at (1) reviewing the indirect impacts of DFADs in tropical tuna, (2) quantifying the modifications induced by DFADs and other anthropic activities on tropical tuna surface habitat, and (3) characterizing the direct and indirect impacts of these modifications, considering tropical tuna behavior and condition.Based on a literature review, Chapter 2 outlines that DFADs do modify tropical tuna habitat, but quantitative characterizations are missing. There is a lack of clear converging scientific evidence on the indirect impacts of DFADs on the behavior and biology of tropical tuna. In the Western Indian Ocean, DFADs strongly increased FOB density, representing around 85 % of the encountered FOBs by observers onboard purse seine vessels (Chapter 3). Other human activities, like deforestation or climate change, did not induce any clear trend of natural floating objects density, suggesting that DFADs are the main driver of tropical tuna surface habitat modifications in the Indian Ocean (Chapter 4). The increase of DFAD density impacts the associative behavior of tropical tuna. A model of tuna behavior shows that this change strongly increased the percentage of their time individual tuna spend associated with FOBs, from 20 % to 68 % in the Western Indian Ocean (Chapter 5). DFADs also impact the associative behavior of tuna aggregations, which is also driven by biophysical characteristics of the environment (Chapter 6). Hence DFADs have a direct impact, through an increase of the time tropical tuna spend associated with FOBS, and consequently their catchability. The analysis of a 20-year dataset on size and weight of yellowfin tuna shows that the increase of FOB density induced by DFADs does not translate into a long-term impact on their condition in the Western Indian Ocean (Chapter 7). This calls for further investigation into the causal link between tuna association with DFADs and their low condition, which can be tested using the mathematical framework developed in Chapter 8.Finally, the work developed in this thesis allowed to improve our understanding of the impacts of DFADs on tropical tuna, which has several implications in terms of management. Further experimental and field work are needed to explore these potential impacts and long-term time series of indicators should be monitored to assess them. As DFADs indirect impacts can act as worsening factors on tuna populations, characterizing them is urgent. Also, this thesis brings new evidence on the reasons underlying tuna associative behavior with FOBs and on the resulting impacts of DFADs. In the Indian Ocean, the situation of tropical tuna stock is alarming, with both yellowfin and bigeye tunas being overexploited. The results of this thesis can help to better determine the impacts of DFADs on tropical tuna and thus contribute to improving the management of this common resource
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Silva, Guelson Batista da. "Tuna fisheries and populational dinamic in aggregated schools in the western equatorial Atlantic". reponame:Repositório Institucional da UFC, 2013. http://www.repositorio.ufc.br/handle/riufc/18714.
Abstract (sommario):
SILVA, Guelson Batista da. Dinâmica populacional e pesca de atuns em cardumes associados no Atlântico oeste equatorial. 2013. 155 f. : Tese (doutorado) - Universidade Federal do Ceará, Centro de Ciências Agrárias, Departamento de Engenharia de Pesca, Fortaleza-CE, 2013Submitted by Nádja Goes (nmoraissoares@gmail.com) on 2016-07-26T14:55:57Z No. of bitstreams: 1 2013_tese_gbsilva.pdf: 25046778 bytes, checksum: fc5e4863285fe78962906db438bfe4a9 (MD5)
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The present study aims to characterize the technolo gical features and the catch composition, complemented with studies on the age a nd growth and feeding of the target species in the fishery for tunas in associated schools in the western equatorial Atlantic. For this purpose, a total of 109 landings by the fleet based on Areia Branca, RN, were observed in the period from June 2010 to M ay 2013, as well as on board in nine fishing cruises in the period from February 2011 to December 2012. The age and growth study was performed based on readings of age rings of the dorsal spines and daily microincrements present in the otolith of Thunnus albacares, adjusted to von Bertalanffy , Gompertz and Logistic growth models, which were selected based on their AIC (Akaike 's Information Criterion) valu es. The feeding study was developed through the identification and assessment of food items present in the stomach contents from T. obesus and T. albacares . The fleet consisted of 9 boats, with an average length overall of 13.4 m, which use various fishing techniques such as handline, rod and line and trolling, combined with natural baits or lures. Landings amounted 691,533 kg, from which, the target species were bigeye and yellowfin tunas, as well as bycatch, species such as dolphinfish, blue marlin, skipjack, wahoo, rainbow runner and, even occasionally, species such as swordfish and triggerfish. The values of L were estimated at 175.13 and 171.6 cm for the obser ved and backcalculated data from the dorsal spines and 166.6, 171.14 and 155.38 cm, respectively for the pooled data, males and females based on otolith daily microstructure. The main food items observed in the diet of both predators were the following fish families: Myctophidae, Exocoetidae, Bramidae and Nomeidae. Cephalopods and crustaceans were occasionally observed. We can conclude that results provide essential information that will ass ist in the understanding of fishing activities as well as expand the knowledge on the biology of the target species.
O presente trabalho tem por objetivo a caracterização dos aspectos tecnológicos e da composição das capturas, complementados com estudos sobre o crescimento e a alimentação das principais espécies na pesca de atuns e afins em cardumes associados no Atlântico Oeste Equatorial. Para tanto, foram acompanhados 109 desembarques em Areia Branca, RN, no período entre jun/2010 e mai/2013, assim como o embarque em nove cruzeiros de pesca no período entre fev/2011 e dez/2012. O estudo de idade e crescimento, foi realizado com base nas leituras de anéis etários nos espinhos dorsais e microincrementos diários de otólitos de Thunnus albacares ajustados aos modelos de crescimento de von Bertalanffy, Gompertz e Logístico, os quais foram selecionados a partir dos valores de AIC (Akaike’s Criterion Information). O estudo de alimentação foi desenvolvido por meio da identificação e avaliação dos itens alimentares presentes no conteúdo estomacal de T. obesus e T. albacares. Foram observadas 9 embarcações, com comprimento total médio de 13,4 m, as quais utilizam diversas técnicas de captura como a linha de mão, vara e linha, corrico e corso, com o uso de iscas artificiais e naturais. Os desembarques totalizaram 691.533 kg de pescado, dentre os quais, as espécies alvo foram a albacora bandolim e a albacora laje, sendo retidas tambem espécies como o dourado, agulhão negro, bonito-listrado, cavala empinge, peixe rei e ainda, ocasionalmente, espécies como espadarte e cangulo. Os valores de L ̅_∞ foram estimados em 175,13 e 171,6 cm para os dados observados e retrocalculados a partir dos espinhos dorsais e em 166,6; 171,14; e 155,38 cm respectivamente para os dados agrupados, para machos e fêmeas a partir dos microincrementos diários de otólitos. Os principais itens alimentares observados na dieta de ambos os predadores foram os peixes das famílias Myctophidae, Exocoetidae, Bramidae e Nomeidae, sendo observadas com menor frequência os cefalópodes e os crustáceos. Podemos concluir que os resultados obtidos fornecem informações essênciais que ajudarão a compreender as atividades de pesca, bem como ampliarão os conhecimentos sobre a biologia das principais espécies capturadas.
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Robert, Marianne. "Le comportement des thons tropicaux autour des objets flottants : de l’étude des comportements individuels et collectifs à l’étude du piège écologique". Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20118/document.
Abstract (sommario):
Le comportement des thons tropicaux autour des objets flottants : De l'étude des comportements individuels et collectifs à l'étude du piège écologiqueLes recherches en halieutique ont pour objectif d'améliorer les connaissances sur le fonctionnement des populations de poissons afin de transférer celle-ci vers des outils de gestion. Ce travail de thèse repose sur un ensemble d'expériences et de modélisations destinées à approfondir notre compréhension générale du comportement associatif de poissons grands pélagiques avec des objets flottantes à la surface de l'océan. Notre objectif est de tester si les milliers d'objets flottants artificiels déployés par les pêcheurs (DCP - Dispositifs de Concentration de Poissons) constituent des pièges écologiques pour les thons tropicaux. Pour mener à bien ce travail, nous avons dans le premier chapitre caractérisé le comportement individuel de thons dans un réseau de DCP ancrés. L'analyse de données de marquage acoustique de 96 thons albacores (Thunnus albacares) (30-96 cm) à Hawaii montre que les thons présentent une plasticité comportementale forte face aux DCP qu'ils rencontrent mais également que le temps de résidence sous les DCP diminue avec la taille des individus. Afin de quantifier l'impact de l'augmentation de la densité de DCP il est essentiel de comprendre les mécanismes et les facteurs qui influencent les temps de résidences sous les DCP. Dans le second chapitre, des expériences de choix binaires suggèrent un rôle de la biomasse agrégée dans la formation, la maintenance et la dispersion des agrégations que forment les thons sous les objets flottants. La quantification de la dynamique des arrivées et des départs des poissons aux DCP permettra de valider les hypothèses que nous proposons concernant les mécanismes sociaux sous-jacents d'une part et d'autre part de tester l'influence de la qualité de l'environnement et de la densité de DCP sur les temps de résidences individuels et la distribution spatiale des populations. Dans le troisième chapitre, la comparaison de facteurs de condition de listaos (Katsuwonus pelamis) matures capturés en bancs libres et sous objets flottants dans une zone naturellement riche en objets flottants, et relativement peu impactée par le déploiement de DCP (Le Canal du Mozambique), nous a permis d'établir un point de référence essentiel pour estimer les effets des perturbations actuelles. Plus généralement, les résultats obtenus dans les différents chapitres tendent à conforter l'hypothèse d'un rôle social et non trophique des objets flottants dans l'écologie de thonidés. Les résultats obtenus durant cette thèse amènent à poser un regard nouveau sur l'hypothèse du piège écologique. Notre travail s'est principalement intéressé à un modèle biologique de choix, les thons tropicaux. Cependant le cadre théorique des questions abordées, les outils d'observations et les méthodes d'analyses développées sont assez génériques pour être appliqués aux autres espèces rencontrées sous les objets flottants. Cette recherche s'intègre plus généralement dans les problématiques visant à mieux comprendre les stratégies comportementales et la distribution des populations dans des environnements multi-sitesResearch in fisheries science aims at investigating the functioning of fish population with the objective of using this knowledge to propose sustainable management measures. This PhD thesis relies on a collection of experiments and modelling designed to further our knowledge on the aggregative behaviour of large pelagic fish with floating structures at the surface of the ocean. The overall objective is to test whether the thousands of man-made floating structures deployed by fishermen (also referred as Fish Aggregating Device –FAD) act as ecological traps for tropical tunas. To archive this main objective, it was first necessary to characterize the individual behaviour of tuna in a network of FAD. In the first chapter, the analysis of 96 acoustically tagged yellowfin tuna (Thunnus albacares) between 30-96 cm FL in the array of anchored FADs around Oahu (Hawaii, US) shows that individuals tuna exhibited behavioural plasticity while in the array and that behaviour around FAD is size dependent. In order to assess the impact of the increasing density of FAD, the major habitat modification, it is essential to understand the factors that influence the residence time at FADs. In the second chapter, binary choice experiments suggest that the aggregated biomass under the FAD play a role in the aggregative process. Nonetheless, quantification of arrival and departure dynamics of fish to FAD are required to validate the assumptions we proposed on the underlying social mechanism. Such model would, then, allow testing the effect of FAD density and environmental conditions on individual residence time and spatial distribution of population. In the third chapter, the comparison of skipjack tuna (Katsuwonus pelamis) condition between individual associated with logs and in free swimming schools in the Mozambique Channel, an area known to be naturally enriched with logs with few FADs, highlights the need for estimating reference points prior to assessing the impacts of anthropogenic modifications to habitats on animals.Combining the different chapters, our results tend to favour a social rather than a trophic role of floating objects in the ecology of tunas. More generally, we discuss what novel insight our results bring up on the ecological trap hypothesis. Tropical tunas represent an interesting model species on which we focused. However, the theoretical framework of the questions we addressed, the observation and analytical tools we developed are generic enough to be applied to the others species that are encountered around floating structures. In a broader extent, this work meets the general topic of studying behavioural strategies and distribution of population in multi-patch environment
6
Baidai, Yannick Diby Armel. "Dérivation d'un indice d'abondance direct pour les thons tropicaux basé sur leur comportement associatif avec les objets flottants". Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTG031.
Abstract (sommario):
Représentant la majorité des captures mondiales de thon, les thons tropicaux sont des espèces d'une importance capitale du fait de leur rôle essentiel en tant que ressource alimentaire et économique. La gestion durable de cette précieuse ressource est tributaire d’une estimation correcte de l’abondance des populations exploitées ainsi que de l’impact de la pression de pêche sur celles-ci. La présente thèse fournit un nouvel indice direct d’abondance capable d’évaluer de manière absolue les tailles des populations de thons tropicaux ainsi que de leurs composantes en nage libre et associée. Les espèces tropicales thonières se caractérisent en effet par un trait comportemental singulier, les amenant à s’associer en masse autour d’objets flottants dérivant en mer. Cette caractéristique est à la base du développement d’un mode de pêche pratiquée par les thoniers senneurs, consistant en la capture des bancs associés aux objets flottants. Ces dernières décennies ont ainsi vu le déploiement massif de milliers de dispositifs de concentration de poissons (DCP) qui sont des objets flottants spécifiquement conçus pour attirer et concentrer les bancs de thons, et généralement équipées de bouées échosondeurs. Ces bouées fournissent en continu aux pêcheurs des informations sur la localisation des DCP et les biomasses de thons associées. Cette thèse propose un cadre méthodologique standard pour le traitement des informations issues de ces dispositifs à des fins d’utilisation scientifique, incluant une nouvelle approche basée sur l’apprentissage supervisé pour l’exploitation des données acoustiques qu’ils fournissent. L’analyse de ces données a permis d’élargir le champ de connaissances sur les dynamiques associatives des agrégations de thons. Il a ainsi été montré que ces dernières différaient significativement entre océans, avec notamment des périodes d’absence de thons sous DCP plus longues dans l’océan Indien que dans l’Atlantique. Le nouvel indice d’abondance proposé par cette thèse exploite également le comportement associatif de ces espèces. Il s’appuie sur une approche de modélisation combinant les données sur les dynamiques d’occupation des objets flottants issues des bouées échosondeurs, aux données de dynamiques associatives individuelles des thons, collectées par marquage électronique. Une première application aux populations de listao de l’océan Indien occidental a permis de fournir des séries temporelles d’abondance absolues et relatives, méthode adoptée pour les évaluations de stocks de cette espèce par la CTOI (Commission des Thons de l’Océan Indien). Ce nouvel indice vient répondre aux besoins critiques actuels de méthodologies complémentaires pour les estimations d’abondance des thons tropicaux (estimations directes), exprimées par l’ensemble des organisations régionales de gestion des pêcheriesRepresenting the majority of the world’s tuna catches, tropical tuna species are of critical importance due to their essential role as food and economic resource. The sustainable management of this valuable resource depends on an accurate estimate of the abundance of the exploited populations and the impact of fishing pressure on them. The present thesis provides a new direct abundance index for tropical tuna populations that account for their free-swimming and associated components. Indeed, tropical tuna species are characterized by a singular behavioral trait that causes them to associate with floating objects drifting at sea. This characteristic has led to the development of a specific fishing mode widely used in tuna purse seine fishery, consisting in the capture of schools associated to floating objects. Recent decades have thus seen the massive deployment of thousands of floating objects known as fish aggregating devices (FADs), specifically designed to attract and concentrate tuna schools. The drifting FADs are equipped with satellite-linked echosounder buoys, which ensure their continuous monitoring, providing fishers with near-real time information on their location and associated tuna biomasses. This thesis presents a standard methodological framework for processing the information from echosounder buoys for scientific use, including a new approach based on supervised learning for processing the acoustic data they provide. The analysis of these data has allowed improving the general knowledge on the associative dynamics of tuna aggregations. Ocean-specific differences were evidenced, with notably longer periods of absence of tuna under FADs in the Indian Ocean than in the Atlantic Ocean. The novel index for estimating tuna abundances proposed by this thesis also exploit this associative behavior. It relies on a modelling approach combining data on the dynamics of the occupancy of floating objects from echosounder buoys with data on the associative dynamics of tuna individuals from electronic tagging. An initial application to skipjack populations in the Western Indian Ocean has made it possible to provide time series of absolute and relative abundances, used for stock assessments of this species. This new index addresses the current critical need for complementary methods for estimating tropical tuna abundances, expressed by all regional fisheries management organizations
7
Imzilen, Taha. "Analyse et modélisation des trajectoires des dispositifs à concentration de poissons dérivants (DCP) dans les zones océaniques tropicales et estimation des risques associés à leur déploiement". Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS266.
Abstract (sommario):
La pollution marine est l’une des principales menaces qui pèsent sur les océans. Une partie importante des déchets et polluants marins provient des activités maritimes, en particulier la pêche, en raison d'équipements jetés, abandonnés, ou perdus. La pêche au thon tropical à la senne contribue à ce problème en construisant et déployant un nombre important de Dispositifs à Concentration de Poissons dérivants (DCP), dont de nombreux sont perdus ou s’échouent en endommageant des habitats fragiles tels que les récifs coralliens. L’objectif général de cette thèse est de proposer trois mesures pour atténuer ces problèmes dans les Océans Indien et Atlantique. Tout d’abord, l’interdiction de déployer des DCP dans les zones risquées permettrait d’éviter un nombre considérable d’échouages. Entre 20% et 40% des échouages pourraient être évités si les déploiements étaient interdits dans l'Océan Indien au sud de 8°N de latitude, dans la zone somalienne en hiver, mais également dans la zone située à l’Ouest des Maldives en été, et au niveau de la zone intertropicale longeant la côte Ouest de l’Afrique pour l'Océan Atlantique. Ensuite, l’identification de régions où les DCP sortent massivement des zones de pêches, ainsi que le passage d’un grand nombre de DCP à proximité de ports, ont mis en évidence que la mise en place d’un programme de récupération des DCP en mer serait efficace pour diminuer considérablement leur perte. Ces deux mesures (interdiction de déploiement et récupération en mer) apparaissent complémentaires puisque les zones qui bénéficieraient moins du premier programme seraient davantage protégées par le second, en particulier au niveau du Nord-Ouest de l'Océan Indien et du Nord du Golfe de Guinée. Enfin, l’évaluation d’un outil de transport Lagrangien pour simuler les trajectoires des DCP a montré que l’efficacité de cet outil à l’échelle du bassin est relativement bonne dans les deux océans, que la capacité à simuler les trajectoires est meilleure dans l’Océan Indien que dans l’Océan atlantique, et que cette capacité dépend de la profondeur et de la résolution spatiale du produit de courant de forçage utilisé. Cet outil pourrait être utilisé en mode opérationnel dans le futur pour anticiper les trajectoires des DCP pouvant conduire à une perte ou à un échouage et donc être utilisé comme un programme de mitigation complémentaire aux deux autres programmes. Les résultats obtenus au cours de ces différents travaux constituent ainsi une base solide pour définir de nouvelles recommandations permettant d’atténuer les risques de perte et d’échouage des DCP et ainsi contribuer à la préservation de nos océans et de nos littorauxMarine pollution has increased over time, becoming a major source of concern. A non-negligible proportion of these waste and pollutants are from sea-based sources, especially fisheries, due to derelict fishing equipment. Tropical tuna purse seine fishing vessels contribute to this problem by deploying large numbers of drifting Fish Aggregating Devices (dFADs), as a significant portion of these floating objects eventually end up derelict, potentially contributing to marine pollution and threatening sensitive ecosystems such as coral reefs. The general objective of this thesis is to use scientific analyses of dFAD trajectory and fishing data to propose mitigation measures to reduce these problems in the Indian and Atlantic Oceans. First, it is demonstrated that prohibiting deployments in areas most likely to lead to beachings has the potential to be effective for reducing the beaching rate. Results indicate that 21% to 40% of beachings could be prevented if deployments were prohibited in high risk areas, roughly delimited by the areas south of 8°S latitude, the Somali zone in winter, and the western Maldives in summer for the Indian Ocean, and in an elongated strip of areas adjacent to the western African coast for the Atlantic Ocean. Next, the identification of areas within the fishing ground where most dFADs exit, as well as the passage of a large number of dFADs close to ports, provides support for the implementation of recovery programs to collect these dFADs at sea and reduce their loss. These two measures appear to be complementary since areas predicted to benefit less from closures are more likely to benefit from recovery programs, particularly in the northwestern Indian Ocean and the northern Gulf of Guinea. Finally, the evaluation of a Lagrangian transport tool to simulate the trajectories of dFADs shows that the efficiency of this tool at the basin scale is relatively good in the two oceans, that the accuracy to simulate the trajectories is better in the Indian Ocean than in the Atlantic Ocean, and that this accuracy depends on the depth and the spatial resolution of the forcing currents product used. This tool could be used in an operational mode in the future to anticipate the trajectories of dFADs that could lead to loss or beaching and therefore be used as a complementary mitigation program to the other two measures described above (prohibiting deployments and recovery at sea). The results obtained during these various works thus constitute a solid basis to define new recommendations to mitigate the risks of loss and beachings of dFADs and thus contribute to the preservation of our oceans and our coasts
8
Hung, Mine-Kune, e 洪銘昆. "Studies on the migration pattern of yellowfin tuna (Thunnus albacares) around the fish aggregating devices (FADs) off South-Western Taiwan". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/ujyt33.
Abstract (sommario):
碩士國立中山大學
海洋事務研究所
96
The spatial movements of yellowfin tunas around the fish aggregating devices which were anchored below 40 meters water with a VEMCO VR2 receiver were investigated using ultrasonic telemetry tags V9P (VEMCO VP9-2H-S256). The experiment was conducted in the Shiao-Liu-Chiu Island of Taiwan from July to September, 2007. A pair of VEMCO VR2 receivers was separated by 400 meter distances in west of south sea ,Taiwan. A total of 9 tagged fishes with different sizes were monitored for maximum 19 days. Preliminary results showed that juvenile fish stayed longer and closer within FADs than the adult fish. Fish could move vertically to as low as 160 meters at daytime. They avoid the surface water where the temperature reach 30oC. In nighttime, juvenile fish that has fork length smaller than 55cm generally moves to the surface mixed layer. On the horizontal movement, there are three types. A) fish stays at FADs site. B) Fish move in and out FADs sites for a few hours period. C) fish moves away from FADs site for a long times (maybe 2~3 days). Sometimes juvenile fish would have B) or C) moved away from the FAD devices during dawn and dusk, and back at daytime. But this would not occurred with large fish. We estimated the attraction radius of FADs at least 1 km.
9
Weng, Jinn-Shing, e 翁進興. "Movements and feeding habits of juvenile yellowfin tuna (Thunnus albacares) associated with subsurface fish aggregating devices (FADs) off southwestern Taiwan". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/73258892715680505654.
Abstract (sommario):
博士國立臺灣海洋大學
環境生物與漁業科學學系
104
The yellowfin tuna, Thunnus albacares, is one of the major species caught around subsurface fish aggregation devices (FADs) in the waters southwestern of Taiwan. An increase in yellowfin tuna catch by danish seine fisheries around the subsurface FADs in southwestern Taiwan waters has been a concern of local government and environmental groups. However, the attraction mechanism of aggregating tunas at the subsurface FADs and the interaction between yellowfin tuna and others organisms are still poorly known. The objectivs of this study are (1) to examine the fine-scale vertical and horizontal movements of juvenile yellowfin tunas around subsurface FAD, (2) to examine the diet and feeding habits of yellowfin tuna. In total, 53 tunas (35–81 cm fork length) were tagged with ultrasonic telemetry tags and released at a subsurface FAD in the waters off Shiao-Liu-Chiu Island, southwestern Taiwan from October 2008 to December 2009. These tunas stayed at the subsurface FAD for up to 31 days, with daytime vertical movement depths averaging 60–80 m at a maximum depth of 250 m. At night, the tuna gathered at a shallow depth of 40 m. The mean depth of vertical movement in the daytime is significantly different from that of the nighttime (p < 0.05, t- test,). The maximum detectable distance of horizontal movement was 1600 m, with 80% of the long horizontal movements occurring in the daytime. It is likely that the purpose of these vertical and horizontal movements was for feeding. Moreover, the tagged tunas did not depart from the subsurface FAD simultaneously, suggesting distinct behaviors in their movements. Stomach contents analysis based on 1477 specimens with fork lengths (FLs) ranging from 24 to 108 cm and stable isotope analysis (202 specimens) collected around subsurface FADs in the waters southwest of Taiwan. Stomach contents analysis indicated that juvenile yellowfin tuna with FL < 50 cm mainly feed on larval Sthenoteuthis oualaniensis, larval shrimps, and zooplanktonic organisms such as Amphipods. Yellowfin tuna with FL of ~50 cm switch their diet to teleost fishes such as Lestrolepis japonica, Benthosema pterotum, Exocoetidae, and Scombridae. Stable isotope analysis indicated that the δ15N values ranged between 6.2and 12.6‰, and the estimated trophic position varied from 3.2 ± 0.2for tuna with FL < 30 cm, while it reached 4.6 ± 0.5 for those with FL > 50 cm and 4.8 ± 0.1 for those with FL > 90 cm. Based on the distinct diet shift of the juvenile yellowfin tuna, demonstrated by both stomach contents and stable isotope analysis, this study concluded that tuna shift their diet at approximately 50 cm FL.
Libri sul tema "Drifting Fish Aggregating Devices":
1
Chapman, L. B. Manual on fish aggregating devices (FADs). Noumea, New Caledonia: Secretariat of the Pacific Community, 2005.
2
Weerasooriya, K. T. Experiences with fish aggregating devices in Sri Lanka. Madras: Development of Small-Scale Fisheries in the Bay of Bengal, 1987.
3
James, Anderson, Gates, Paul D., d. 1994. e South Pacific Commission. Coastal Fisheries Programme. Capture Section., a cura di. South Pacific Commission fish aggregating device (FAD) manual. Noumea, New Caledonia: Coastal Fisheries Programme, Capture Section, South Pacific Commission, 1996.
4
Preston, G. L. Vertical longlining and other methods of fishing around fish aggregating devices (FADs): A manual for fishermen. Noumea, New Caledonia: Secretariat of the Pacific Community, 1998.
5
Bay of Bengal Programme. Small-Scale Fisherfolk Communities., a cura di. Biosocioeconomic assessment of the effects of fish aggregating devices in the tuna fishery in the Maldives. Madras: Bay of Bengal Programme, 1994.
6
Petaia, S. Capture Section report of fish aggregating device (FAD) site survey, construction, and deployment assistance to the Fisheries Department of Tuvalu: Phase I, 7-24 October 1995 and Phase II, 17 May-7 June 1996. Noumea, New Caledonia: South Pacific Commission, Coastal Fisheries Programme, 1997.
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WECAFC Ad Hoc Working Group on the Development of Sustainable Moored Fish Aggregating Device Fishing in the Lesser Antilles. Meeting. Report of the Second Meeting of the WECAFC Ad Hoc Working Group on the Development of Sustainable Moored Fish Aggregating Device Fishing in the Lesser Antilles: Le Robert, Martinique, 8-11 October 2004. Rome: Food and Agriculture Organization of the United Nations, 2007.
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Beverly, S. Capture Section report of Wallis and Futuna fish aggregating device (FAD): Technical assistance projects : 25 August to 15 September 1992, 7-11 November 1992, and 23-29 July 1995. Noumea, New Caledonia: Secretariat of the Pacific Community, 1999.
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Western Central Atlantic Fishery Commission. Ad Hoc Working Group on the Development of Sustainable Moored Fish Aggregating Device Fishing in the Lesser Antilles. Meeting. Report of the First Meeting of the WECAFC Ad Hoc Working Group on the Development of Sustainable Moored Fish Aggregating Device Fishing in the Lesser Antilles: Le Robert, Martinique, 8-11 October 2001. Rome: Food and Agriculture Organization of the United Nations, 2002.
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Symposium on Artificial Reefs and Fish Aggregating Devices as Tools for the Management and Enhancement of Marine Fishery Resources (1990 Colombo, Sri Lanka). Report of the Symposium on Artificial Reefs and Fish Aggregating Devices as Tools for the Management and Enhancement of Marine Fishery Resources, Colombo, Sri Lanka, 14-17 May 1990. Bangkok: Regional Office for Asia and the Pacific, Food and Agriculture Organization of the United Nations, 1991.
Capitoli di libri sul tema "Drifting Fish Aggregating Devices":
1
Marsac, Francis, e Patrice Cayré. "Telemetry applied to behaviour analysis of yellowfin tuna (Thunnus albacares, Bonnaterre, 1788) movements in a network of fish aggregating devices". In Advances in Invertebrates and Fish Telemetry, 155–71. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5090-3_19.
2
Jani, Jarina Mohd. "The Status of Artisanal Fish Aggregating Devices in Southeast Asia". In Modern Fisheries Engineering, 57–66. CRC Press, 2020. http://dx.doi.org/10.1201/9780429328039-6.
Atti di convegni sul tema "Drifting Fish Aggregating Devices":
1
Sinopoli, Mauro, Fabio Badalamenti e Giovanni D'Anna. "The role of FADs (Fish Aggregating Devices) in the coastal dispersion of juvenile fish species in the North-Western Sicily". In 2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea). IEEE, 2022. http://dx.doi.org/10.1109/metrosea55331.2022.9950817.
2
Aabel, J. P., S. J. Cripps e G. Kjeilen. "Offshore Petroleum Installations in the North Sea used as Fish Aggregating Devices - Potential and Suggestions for Preparation, Management and Monitoring". In SPE Health, Safety and Environment in Oil and Gas Exploration and Production Conference. Society of Petroleum Engineers, 1996. http://dx.doi.org/10.2118/35919-ms.
Rapporti di organizzazioni sul tema "Drifting Fish Aggregating Devices":
1
Kramer, Sharon H., Christine D. Hamilton, Gregory C. Spencer e Heather O. Ogston. Evaluating the Potential for Marine and Hydrokinetic Devices to Act as Artificial Reefs or Fish Aggregating Devices. Based on Analysis of Surrogates in Tropical, Subtropical, and Temperate U.S. West Coast and Hawaiian Coastal Waters. Office of Scientific and Technical Information (OSTI), maggio 2015. http://dx.doi.org/10.2172/1179455.
2
Evaluation of the project "Enhancing Livelihoods and Food Security though Fisheries with Nearshore Fish Aggregating Devices in the Pacific Ocean". FAO, giugno 2024. http://dx.doi.org/10.4060/cd1019en.