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Articles de revues sur le sujet "Indian Marine Fishing Fleet"
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Tixier, Paul, Mary-Anne Lea, Mark A. Hindell, Christophe Guinet, Nicolas Gasco, Guy Duhamel et John P. Y. Arnould. « Killer whale (Orcinus orca) interactions with blue-eye trevalla (Hyperoglyphe antarctica) longline fisheries ». PeerJ 6 (8 août 2018) : e5306. http://dx.doi.org/10.7717/peerj.5306.
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Over the past five decades, marine mammal interactions with fisheries have become a major human-wildlife conflict globally. The emergence of longline fishing is concomitant with the development of depredation-type interactions i.e., marine mammals feeding on fish caught on hooks. The killer whale (Orcinus orca) is one of the species most involved in depredation on longline fisheries. The issue was first reported in high latitudes but, with increasing expansion of this fishing method, other fisheries have begun to experience interactions. The present study investigated killer whale interactions with two geographically isolated blue-eye trevalla (Hyperoglyphe antarctica) fisheries operating in temperate waters off Amsterdam/St. Paul Islands (Indian Ocean) and south-eastern Australia. These two fisheries differ in the fishing technique used (vertical vs. demersal longlines), effort, catch, fleet size and fishing area size. Using 7-year (2010–16) long fishing and observation datasets, this study estimated the levels of killer whale interactions and examined the influence of spatio-temporal and operational variables on the probability of vessels to experience interactions. Killer whales interactions occurred during 58.4% and 21.2% of all fishing days, and over 94% and 47.4% of the fishing area for both fisheries, respectively. In south-eastern Australia, the probability of occurrence of killer whale interactions during fishing days varied seasonally with a decrease in spring, increased with the daily fishing effort and decreased with the distance travelled by the vessel between fishing days. In Amsterdam/St. Paul, this probability was only influenced by latitude, with an increase in the southern part of the area. Together, these findings document two previously unreported cases of high killer whale depredation, and provide insights on ways to avoid the issue. The study also emphasizes the need to further examine the local characteristics of fisheries and the ecology of local depredating killer whale populations in as important drivers of depredation.
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Sathianandan, T. V., Kolliyil Sunil Mohamed, Jayaraman Jayasankar, Somy Kuriakose, K. G. Mini, Eldho Varghese, P. U. Zacharia et al. « Status of Indian marine fish stocks : modelling stock biomass dynamics in multigear fisheries ». ICES Journal of Marine Science 78, no 5 (5 mai 2021) : 1744–57. http://dx.doi.org/10.1093/icesjms/fsab076.
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Abstract A biomass dynamics modelling study to derive biological reference points and management requirements of 223 commercially important fish stocks in different maritime states of India was conducted. Two decades (1997–2016) of fishery-related data on the harvest of resources by different types of fishing fleets formed the input. The multigear nature of the fishery situation was solved by introducing a gear standardization parameter into the biomass dynamics model. The relative positions of the fish stocks were depicted through Kobe plots generated for the ten maritime states/union territory, and the fish stocks were categorized, based on the status, into sustainable, overfished, recovering, and overfishing. The results indicate that 34.1% of the assessed fish stocks in the country are sustainable, 36.3% are overfished, 26.5% are recovering, and 3.1% are in the overfishing status. Regionally, the percentage of sustainable fish stocks were high along the southwest coast (51.6%), overfished stocks were high along the northwest coast (54.2%), and recovering fish stocks were high along the northeast coast (47.8%). The national mean B/BMSY was estimated as 0.86, which is a strong reason for strengthening fisheries management. Fishing fleets harvesting overfished stocks were examined for each maritime state, and recommendations regarding reduction in annual fishing hours are made.
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Rahman, Berri Miraz Kholipah, Wazir Mawardi, Muhammad Fedi Alfiadi Sondita et Craig Proctor. « Estimation of Plastic and Other Waste Disposed of by Longline and Gillnet Fleets Operating from Cilacap ». ILMU KELAUTAN : Indonesian Journal of Marine Sciences 27, no 2 (8 janvier 2022) : 141–50. http://dx.doi.org/10.14710/ik.ijms.27.2.141-150.
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Tuna-fishing boats based at the Cilacap Oceanic Fishing Port are potential contributors to marine debris in the Indian Ocean. Without a quantitative assessment of the types and amount of debris, port management cannot develop a strategy to address this problem. This study estimated the quantities of plastics and cartons disposed of by these fisheries in the Indian Ocean. Data were collected through observations and interviews with boat managers/owners or fishermen in the port, from August to November 2019, to evaluate the boat supplies loaded on board in the port and the waste returned to the port. The marine disposal per fishing trip (the difference between the quantity of supplies taken to sea and the quantity of waste returned to port) was calculated for 89 trips of gillnet and longline boats, for a size range of 20 to 90 GT. There was no at-sea disposal of used engine oil, rice plastic sacks, styrofoam boxes, nor plastic gallon bottles. Other plastics and cartons from consumable packaging were disposed of at sea. The estimates of the plastic waste disposed were 0.8-4.4 kg.boat-1.trip-1 or 2,143-12,024 pieces.boat-1.trip-1 while the estimates of the cartons disposed were 3.5-19.4 kg.boat-1.trip-1 or 203-1,140 pieces.boat-1.trip-1. The study concluded that fishers could easily keep the waste onboard for disposal on return to port. In addition, port management should initiate a system in which the amounts of waste returned to boats returning to port are considered in granting future port clearance to those boats.
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Prem Monickaraj, Vigilson, Sterlin Rani Devakadacham, Nithyadevi Shanmugam, Nithya Nandhakumar, Manjunathan Alagarsamy et Kannadhasan Suriyan. « Deep learning and machine learning classification technique for integrated forecasting ». IAES International Journal of Artificial Intelligence (IJ-AI) 13, no 2 (1 juin 2024) : 1519. http://dx.doi.org/10.11591/ijai.v13.i2.pp1519-1525.
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Smart fisheries are increasingly using artificial intelligence (AI) technologies to increase their sustainability. The potential fishing zone (PFZ) forecasts several fish aggregation zones throughout the duration of the prediction in any sea. The autoregressive integrated moving average (ARIMA) and random forest model are used in the current study to provide a technique for locating viable fishing zones in deep marine seas. A significant amount of data was gathered for the database's creation, including monitoring information for Indian fishing fleets from 2017 to 2019. Using expert label datasets for validation, it was discovered that the model's detection accuracy was 98%. Our method uses salinity and dissolved oxygen, two crucial markers of water quality, to identify suitable fishing zones for the first time. In the current research, a system was created to identify and map the quantity of fishing activity. The tests use a number of parameter measurements to evaluate the contrast-enhanced computed tomography (CECT) approach to machine learning (ML) and deep learning (DL) methodologies. The findings showed that the CECT had a 94% accuracy rate compared to a convolutional neural network's 92% accuracy rate for the 80% training data and 20% testing data.
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Ramenzoni, Victoria C. « Endenese Fisheries : Exploratory Findings on Environmental Perceptions, Fish Effort, and Overfishing in Eastern Indonesia ». Ethnobiology Letters 4 (8 mars 2013) : 39–51. http://dx.doi.org/10.14237/ebl.4.2013.8.
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Fishing fleets in South East Asia have recently experienced unprecedented expansion. Consequently, catches and regional diversity have dramatically decreased throughout the Indian Ocean. Regional governments and conservation organizations blame the local fishermen and their use of damaging fishing practices for the present state of resources. However, many of these institutions endorse a narrow perspective on bioeconomic governance and human action (rational action choice) that compromises the understanding of resource use and exploitation among small-scale fisheries. Over the last few decades, there is a growing recognized tradition that points to the importance of ecological systems of knowledge, uncertainty representation, and traditional skills, in conceptualizing processes of environmental decision-making and the likelihood of introducing successful sustainability practices. In line with this perspective, this article presents preliminary findings regarding resource use decision-making processes among Endenese fishing villages in central Flores Island, Indonesia. Grounded on 22 months of ethnographic, experimental and ecological research (semistructured interviews, participant observation, visual surveys, probability and uncertainty assessments), and exploring local cognitive representations of marine processes, climate, ichthyology and the role of luck, this article discusses the current economic representations of small-scale fishers as avid maximizers. It concludes by emphasizing the need to further explore the role of mental models and beliefs regarding uncertainty in motivating fishing effort to design adequate conservation and governance programs.
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Fernando, Daniel, et Joshua D. Stewart. « High bycatch rates of manta and devil rays in the “small-scale” artisanal fisheries of Sri Lanka ». PeerJ 9 (8 septembre 2021) : e11994. http://dx.doi.org/10.7717/peerj.11994.
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Background Expanding fisheries in developing nations like Sri Lanka have a significant impact on threatened marine species such as elasmobranchs. Manta and devil (mobulid) rays have some of the most conservative life history strategies of any elasmobranch, and even low to moderate levels of bycatch from gillnet fisheries may lead to significant population declines. A lack of information on life history, demographics, population trends, and fisheries impacts hinders effective management measures for these species. Method We report on mobulid fishery landings over nine years between 2011 and 2020 across 38 landing sites in Sri Lanka. We collected data on catch numbers, body sizes, sex, and maturity status for five mobulid species. We used a Bayesian state-space model to estimate monthly country-wide catch rates and total annual landings of mobulid rays. We used catch curve analyses to estimate total mortality for Mobula mobular, and evaluated trends in recorded body sizes across the study period for M. mobular, M. birostris, M. tarapacana and M. thurstoni. Results We find that catch rates have declined an order of magnitude for all species across the study period, and that total annual captures of mobulid rays by the Sri Lankan artisanal fishing fleet exceed the estimated annual captures of mobulids in all global, industrial purse seine fisheries combined. Catch curve analyses suggest that M. mobular is being fished at rates far above the species’ intrinsic population growth rate, and the average sizes of all mobulids in the fishery except for M. birostris are declining. Collectively, these findings suggest overfishing of mobulid ray populations in the northern Indian Ocean by Sri Lankan artisanal fisheries. We recommend strengthening the management of these species through improved implementation of CITES, CMS, and regional fisheries management actions. In addition, we report on the demographic characteristics of mobulids landed in Sri Lanka and provide the first record of M. eregoodoo in the country.
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Rousseau, Yannick, Reg A. Watson, Julia L. Blanchard et Elizabeth A. Fulton. « Evolution of global marine fishing fleets and the response of fished resources ». Proceedings of the National Academy of Sciences 116, no 25 (28 mai 2019) : 12238–43. http://dx.doi.org/10.1073/pnas.1820344116.
Texte intégralRésumé :
Previous reconstructions of marine fishing fleets have aggregated data without regard to the artisanal and industrial sectors. Engine power has often been estimated from subsets of the developed world, leading to inflated results. We disaggregated data into three sectors, artisanal (unpowered/powered) and industrial, and reconstructed the evolution of the fleet and its fishing effort. We found that the global fishing fleet doubled between 1950 and 2015—from 1.7 to 3.7 million vessels. This has been driven by substantial expansion of the motorized fleet, particularly, of the powered-artisanal fleet. By 2015, 68% of the global fishing fleet was motorized. Although the global fleet is dominated by small powered vessels under 50 kW, they contribute only 27% of the global engine power, which has increased from 25 to 145 GW (combined powered-artisanal and industrial fleets). Alongside an expansion of the fleets, the effective catch per unit of effort (CPUE) has consistently decreased since 1950, showing the increasing pressure of fisheries on ocean resources. The effective CPUE of most countries in 2015 was a fifth of its 1950s value, which was compared with a global decline in abundance. There are signs, however, of stabilization and more effective management in recent years, with a reduction in fleet sizes in developed countries. Based on historical patterns and allowing for the slowing rate of expansion, 1 million more motorized vessels could join the global fleet by midcentury as developing countries continue to transition away from subsistence fisheries, challenging sustainable use of fisheries' resources.
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Biton Porsmoguerador, Sebastián. « Análisis de la pesca española en el Atlántico noreste 1980-2012 : Papel de Galicia en la explotación de las principales especies marinas ». Revista de Biología Marina y Oceanografía 52, no 2 (18 octobre 2019) : 411–15. http://dx.doi.org/10.22370/rbmo.2017.52.2.1991.
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The Spanish fishing fleet is one of the most important in the European Union and is exploiting marine resources in the FAO area 27 (North-eastern Atlantic Ocean). The Galician Region has a relevant role in the fishing industry. The number of boats decreased significantly between 1980 and 2012. But the landing quantities of the main marine species exploited (small pelagic fishes and tuna species mainly) decreased faster that the fleet during the same period. In contrast, landing quantities of Elasmobranchs (sharks and rays) and Cephalopods increased. This analysis shows the overexploitation of the Atlantic fishing grounds.
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Biton Porsmoguerador, Sebastián. « Análisis de la pesca española en el Atlántico noreste 1980-2012 : Papel de Galicia en la explotación de las principales especies marinas ». Revista de Biología Marina y Oceanografía 52, no 2 (18 octobre 2019) : 411–15. http://dx.doi.org/10.22370/rbmo.2017.52.2.1991.
Texte intégralRésumé :
The Spanish fishing fleet is one of the most important in the European Union and is exploiting marine resources in the FAO area 27 (North-eastern Atlantic Ocean). The Galician Region has a relevant role in the fishing industry. The number of boats decreased significantly between 1980 and 2012. But the landing quantities of the main marine species exploited (small pelagic fishes and tuna species mainly) decreased faster that the fleet during the same period. In contrast, landing quantities of Elasmobranchs (sharks and rays) and Cephalopods increased. This analysis shows the overexploitation of the Atlantic fishing grounds.
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Wally, Naglaa, Nabil Abdel-Hakeem et Ahmed Eldimiri. « Economic Efficiency for Egyptian Marine Fishing Fleet Exploitation ». Egyptian Journal of Aquatic Biology and Fisheries 12, no 4 (1 septembre 2008) : 63–71. http://dx.doi.org/10.21608/ejabf.2008.2005.
Texte intégralThèses sur le sujet "Indian Marine Fishing Fleet"
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Ghosh, Neelangshu. « A Study using DEA to evaluate the efficiency of the Indian Marine Fishing Fleet ». Thesis, University of North Bengal, 2010. http://hdl.handle.net/123456789/259.
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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.
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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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Michael, PE. « Pelagic longlines and albatross in the southern Indian Ocean : interactions of fleet dynamics, climate change, and albatross ». Thesis, 2017. https://eprints.utas.edu.au/23885/1/Michael_whole_thesis.pdf.
Texte intégralRésumé :
The greater Southern Ocean is vast, valuable, and vulnerable. Land masses are few and intense atmospheric and oceanographic conditions create a mosaic of logistical challenges for access. The Southern Ocean is home to unique species, including all but three of the world’s albatross species and high value tunas targeted by distant-water pelagic longline fleets from multiple flagstates. Exploitation of tunas has contributed to some stocks being over-fished while indirect exploitation, through incidental bycatch, has severely impacted many albatross colonies. The impacts of climate change will further complicate the current interactions within the Southern Ocean, including those between fish, fishers, and albatross.
This thesis predicts the potential future for Southern Ocean tuna, fishers, and albatross, focusing on the Indian Ocean sector of the Southern Ocean, with some analyses in the Atlantic sector as well. The first chapter introduces the Southern Ocean, major tuna fisheries, their interactions with albatross and the potential impacts of climate change. It then describes the approach taken in this thesis. As fishers interact with both fish and albatross, the second chapter quantifies the broad-scale patterns in pelagic longline effort across both the Indian and Atlantic sectors of the Southern Ocean. This assessment reveals a strong seasonal cycle in the magnitude and distribution of effort in both sectors, generally in association with changing target species. This shift in target species is associated with both ecological (species moving to different areas) and management (start of the quota year) conditions.
The third chapter develops a novel approach to modeling fleet dynamics for distant water pelagic longline effort for Japanese and Taiwanese fleets. These models project the potential impacts of climate change on the distribution of fishing effort. From a range of effort allocation strategies that consider modelled catch per unit effort (CPUE) of four different tuna species, cost, value, and predicted variability in CPUE in each fished area, the distribution of effort in both fleets was most similar to preferentially allocating effort into areas of low predicted variability. Using environmental parameters projecting climate change in our tuna distribution models, the models forecast an average decrease in CPUE, an increase in the average predicted variability of CPUE, and decrease in effort, related to the fishing strategy identified above; fishing in areas of low predicted variability.
The fourth chapter assesses the population dynamics of black-browed albatross (Thalassarche melanophris) breeding on Kerguelen Island, in the central western portion of the study area. This assessment uses an integrated population model structured by sex, age-class, breeding stage, and reproductive history and operates on a monthly, 5˚ × 5˚ temporal and spatial scale. We quantify the bycatch of each super-fleet (fleets grouped by gear-type and reported bycatch rates) and the impact of environmental conditions on the albatross population. These analyses indicate that high bycatch in the 1990s- early 2000’s decreased the population, with bycatch attributed to illegal, unreported and unregulated (IUU) demersal and non-Japanese pelagic longline effort, although the model’s ability to differentiate bycatches between pelagic super-fleets is weak. In line with other studies, warmer SSTs during the incubation period favors higher productivity.
In the final research chapter, the models described above (Ch. 3 and 4) are combined to project the synergistic impacts of climate change on albatross and fleet dynamics. Reduced effort by the Taiwanese and Japanese fleets had very little impact on the population, as bycatch by pelagic longline fleets was projected to be virtually absent even with higher levels of effort. The impact of warming SST during the incubation period increased chick survival. However, the associated increase in juvenile and immature albatross in the following years results in a density-dependent decrease in juvenile survival to age five, ultimately reducing the total number of breeding pairs in the population relative to a projection assuming no change in SST.
This work presents one of the first examples of research combining fleet dynamics with albatross population dynamics to quantify the potential impacts of climate change. The patterns identified in the broad-scale distribution of fishing effort (Ch. 2) informed the development of the fleet dynamics model (Ch. 3). After a thorough analysis of the drivers of black-browed albatross population dynamics, including the environment and bycatch of multiple fleets (Ch. 4), these projections were combined (Ch. 5).This approach demonstrates the utility of fleet dynamics models and underscores the flexibility of integrated population models when assessing how changes in multiple factors (e.g. environmental parameters, bycatch) can impact a given population in the future. These types of models can assist conservation and fisheries managers make important decisions regarding mitigation of both bycatch and the environmental impacts of climate change.
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Lan, Kuo-Wei, et 藍國瑋. « Longline Fishing Conditions of Yellowfin Tuna (Thunnus albacares) Associated with Marine Environmental Variations in the Indian Ocean ». Thesis, 2012. http://ndltd.ncl.edu.tw/handle/33010648694264759209.
Texte intégralRésumé :
博士國立臺灣海洋大學
環境生物與漁業科學學系
100
Yellowfin tuna (YFT; Thunnus albacares) is one of the main target species of the commercial tuna longline (LL) fishery and has a long history of being the subject of scientific research in the Indian Ocean. In this study, we collected Taiwanese LL fishery data and environment variables during the period of 1980–2005. The principal component analysis (PCA) and wavelet analysis were used to investigate the relationship between LL catch data of YFT and oceanic environmental factors. The results were summarized as below: In the Indian Ocean, YFT is one of the most important target species in the Arabian Sea and Western-Center Indian Ocean. The major fishing season in the Arabian Sea is in the first and second quarters with a average nominal catch per unit effort (CPUE) about 14.92 fish/103 hooks and a average catch about 401 metric tons. In the Western-Center Indian Ocean, the catch and effort were the highest in all of the Indian Ocean and the average nominal CPUE was about 3.13 fish/103 hooks. Although there were highest effort in the Southern Indian Ocean from June to September, but the average nominal CPUE was lower than 2 (fish/103 hooks) and the average catch was lower than 50 metric tons. Results of the PCA showed that monthly variations in values were significantly correlated with the sea surface temperature (SST), subsurface temperature at 105 m and chlorophyll-a concentration. In April and May, the SST was generally higher with deep mixed layer depth. After July, a drop in the temperature below the preferred temperature range for YFT is probably the reason why the CPUE subsequently decreased. In addition, the CPUE at a given time was significantly affected by chlorophyll-a concentrations 1–3 months prior to that time were probably due to a lag effect of trophic transformation. The regular LL (RLL) CPUE had a negative coefficient and deep LL (DLL) had a positive coefficient with the mixed layer depth anomaly. This implies that the shallow mixed layer depth produces a high CPUE for the RLL and the deep mixed layer depth causes a high CPUE for the DLL. In the long-term time series analysis, the main factor causing interannual variations in the CPUE of the RLL and DLL might change with time. RLL and DLL CPUE values showed positive correlations with SST and Dipole Mode Index from the beginning of the 1980s to the middle of the 1990s. The RLL and DLL CPUE were found to have a significant coherence of the two phases with a periodicity of 3 yr with and mixed layer depth. Finally, we investigated the catches and distributions of yellowfin tuna in relation to climatic and marine environmental variations in the Indian Ocean. The gravity of yellowfin tuna fishing grounds showed similar variations with a climatic index, and an advanced time series analysis also showed a significant negative correlation between the climatic index and the CPUE with a periodicity of 2–3 yr. It suggested that decreases in areas of SST and net primary production optimal for YFT during positive Indian Ocean Dipole events would decrease the CPUE in the western Indian Ocean, while an increase in optimal areas would result in an increased CPUE in negative Indian Ocean Dipole events, especially in the Arabian Sea and surrounding seas of Madagascar.
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Chen, Zhao-Yang, et 陳昭仰. « Study on the Swordfish (Xiphias gladius) Fishing Conditions of Taiwan Longline Fishery Associated with Marine Environmental Variations in the Indian Ocean ». Thesis, 2012. http://ndltd.ncl.edu.tw/handle/97755703710940823823.
Texte intégralRésumé :
碩士國立臺灣海洋大學
環境生物與漁業科學學系
100
The swordfish (Xiphias gladius) is one of the important commercial species of the Taiwanese longline (LL) fishery in the Indian Ocean. In this study, we collected the Taiwanese LL data and environment variables during the period of 1998-2008. The Generalized Additive Models (GAM) was used to explore the correlation between LL catch data of swordfish and oceanic environmental factors. We then use the predict modes of GAM to predict the fishing grounds of swordfish. High nominal catch per unit effort (CPUE) areas are concentrated in the northwestern and southwestern Indian Ocean where are accounting for 66% and 20% of total catch, receptively. The major fishing season is in the second and third quarters. The results of statistics showed the CPUE were significantly correlated with all the temporal (year and month), spatial (longitude and latitude) and environmental variables (Sea surface temperature (SST), net primary production (NPP), sea surface height anomaly (SSHA), mixed layer depth (MLD), number of hook per basket (NHB)). The high CPUE is associated with 22-23℃ of SST, 200-400 mg C/m-2 d-1 of NPP, 0.6-0.7m of SSHA and around 100m of MLD. The predict models of GAM exhibit the best fishing grounds were located in the northwestern and southwestern Indian Ocean, too. The variations of catches and distributions of swordfish in relation to climatic index in the Indian Ocean were investigated by Regression Analysis. It suggested that decreases in areas of optimal SST and NPP areas for swordfish during positive Indian Ocean Dipole events would decrease the CPUE in the western Indian Ocean, while an increase in optimal areas would result in an increased CPUE in negative Indian Ocean Dipole events, especially in the seas around the eastern Somalia and northern Madagascar.
Livres sur le sujet "Indian Marine Fishing Fleet"
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South Indian Federation of Fishermen Societies. et Kerala Research Programme on Local Level Development., dir. A census of the artisanal marine fishing fleet of Kerala : Dec. 97-Feb. 98. Thiruvananthapuram : South Indian Federation of Fishermen Societies, 1999.
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Scullion, Littler Diane, dir. Waterways & byways of the Indian River Lagoon : Field guide for boaters, anglers & naturalists. Washington, DC : OffShore Graphics, Inc., 2003.
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Canada. Indian treaties and surrenders, from 1680 to 1890. Ottawa : B. Chamberlain, 2002.
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Canada. Indian treaties and surrenders, from 1680 to 1890. Ottawa : B. Chamberlain, 2002.
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Canada. Indian treaties and surrenders, from 1680 to 1890. Ottawa : National Archives of Canada, 1997.
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Canada. Indian treaties and surrenders, from 1680 to 1890. Ottawa : S.E. Dawson, Printer to the King, 1990.
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Canada. Indian treaties and surrenders, from 1680 to 1890. Ottawa : B. Chamberlin, 1993.
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Preikshot, David. Fishing for answers : Analysis of ecosystem dynamics, tropic shifts, and salmonid population changes in Puget Sound, WA, 1970-1999 : a report, prepared for the Northwest Indian Fisheries Commission, on an investigation of changes in the south Puget Sound ecosystem, from 1970 to 1999, using a dynamic mass balance model (Ecopath with Ecosim), with special reference to chinook salmon (Oncorhynchus tshawytsha) and coho salmon (O. kisutch). Vancouver, B.C : Fisheries Centre, University of British Columbia, 2001.
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Canada. Pacific Salmon Treaty : Including : Yukon River agreement, revisions to December, 2002, memorandum of understanding (1985), exchange of notes--1985, 1999 & 2002. [Vancouver, B.C.?] : Pacific Salmon Commission, 2004.
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Canada. Agreement amending treaty with Canada concerning Pacific Coast albacore tuna vessels and port privileges : Message from the President of the United States transmitting agreement amending treaty between the government of the United States of America and the government of Canada on Pacific Coast albacore tuna vessels and port privileges done at Washington, D.C., May 26, 1981 (The "Treaty"), effected by an exchange of diplomatic notes at Washington on July 17, 2002, and August 13, 2002 (The "Agreement"). Washington : U.S. G.P.O., 2003.
Trouver le texte intégralChapitres de livres sur le sujet "Indian Marine Fishing Fleet"
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Deshpande, Paritosh C. « Role of Resource Users’ Knowledge for Developing Realistic Strategies for a Circular Economy for Plastics from the Norwegian Fishing Sector ». Dans Marine Plastics : Innovative Solutions to Tackling Waste, 255–69. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-31058-4_14.
Texte intégralRésumé :
AbstractThe complexity of resource management often demands an integration of transdisciplinary methods to find sustainable solutions. The absence of aggregated scientific information threatens holistic and robust resource management. Contrary to traditional resource management studies, the involvement and engagement of resource users are prioritized here. As resource users and stakeholders are significant, yet unexplored sources of information, this study presents a stepwise approach that includes resource users’ local ecological knowledge in gathering the information necessary for resource management. The framework’s application is then demonstrated in the case of plastic fishing gear deployed by the commercial fishing fleet of Norway. The insights from stakeholders were used to ascertain potential barriers and opportunities in establishing circular and sustainable management strategies for Fishing gear resource management in Norway.
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Carboni, Donatella, Giovanni Messina, Vittorio Gazale et Ester Tarricone. « Fishing and territory. Status and perspectives of Sardinia artisanal fisheries. The case of traditional fishery in Asinara Island MPA ». Dans Ninth International Symposium “Monitoring of Mediterranean Coastal Areas : Problems and Measurement Techniques”, 175–86. Florence : Firenze University Press, 2022. http://dx.doi.org/10.36253/979-12-215-0030-1.16.
Texte intégralRésumé :
This study outlines small-scale fishing Sardinia through specificities related to the state of the fishing fleet at the major and minor port systems of the island, the main techniques, and tools (fixed longlines, bottom trawls, purse seines, casting nets, driftnets). Mapping fishing areas in the Marine Protected Area of Asinara Island was important to define efficient fisheries management measures shared by stakeholders. Therefore, the work focused on the mapping of fishing areas in MPA, its techniques and tools.This work is a premise for future and more applicative lines of research
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Malakar, Krishna, Trupti Mishra et Anand Patwardhan. « Developing Indices for Adaptation and Adaptive Capacity in Indian Marine Fishing ». Dans Climate Change Research at Universities, 401–21. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58214-6_26.
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Rodhouse, P. G., C. D. Elvidge et P. N. Trathan. « Remote sensing of the global light-fishing fleet : An analysis of interactions with oceanography, other fisheries and predators ». Dans Advances in Marine Biology, 261–303. Elsevier, 2001. http://dx.doi.org/10.1016/s0065-2881(01)39010-7.
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Arthur, Rohan. « Narratives from Indian Seas ». Dans At Nature's Edge, 229–48. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199489077.003.0011.
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While terrestrial conservation in India strives to achieve a historical stasis built on a strong preservationist Edenic ecology, coastal and marine systems have always been multi-use environments whose management has had to embrace the dynamic realities of historical contingencies. The author discusses two case studies from the Lakshadweep Archipelago documenting how near-historical processes have sculpted the ecology of these coupled social-ecological systems. The first shows how the resilience of coral reefs to climate change was epiphenomenally enhanced by a pelagic fisheries development programme that deflected fishing away from reefs. The second documents the unforeseen consequences of effective green turtle conservation – leading to major conflict with local fishers and a decline in seagrass ecosystems.
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« Mitigating Impacts of Natural Hazards on Fishery Ecosystems ». Dans Mitigating Impacts of Natural Hazards on Fishery Ecosystems, sous la direction de Benedict C. Posadas, Ruth A. Posadas et William S. Perret. American Fisheries Society, 2008. http://dx.doi.org/10.47886/9781934874011.ch11.
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<em>Abstract.</em>—An economic assessment of the commercial and recreational fisheries was undertaken in Mississippi from November 2005 to February 2006 to determine the level of damage sustained as a result of Hurricane Katrina. This assessment was a collaborative effort arising from the federal (National Marine Fisheries Service [NOAA Fisheries]) and state (Mississippi Department of Marine Resources [DMR]) government agencies’ urgent and compelling need to complete damage assessments in the affected areas in as short a period as possible. An accurate assessment of the damage created by this storm was needed to ensure that federal funds are both adequate and allocated to the appropriate sectors and recipients. The Mississippi State University– Coastal Research and Extension Center (CREC) and the Mississippi–Alabama Sea Grant Extension Program accepted the task of estimating the damages brought about by the hurricane to the state’s fishery resources and communities. The assessment of the impacts on the state commercial and recreational fisheries industries covered commercial seafood processors and dealers, the commercial fishing fleet, live-bait dealers, marinas, for hire charter boats, and land-based support facilities. Data were collected from survey questionnaires mailed to all resident vessels and facilities licensed in the state of Mississippi. In addition, personal interviews with fishermen and site visits of facilities were conducted in four coastal locations by DMR and CREC personnel. The results of the assessment indicated that all of the seafood processing plants, support facilities, and live-bait dealers, 86.7% of the commercial fleet, 60% of the seafood dealers, and 69% of the for-hire charter fleet that responded to the survey were damaged by the storm. Disaster assistance programs developed by NOAA Fisheries, which were approved by Congress in 2006, were administered by DMR to participating licensed operators of commercial fishing and for-hire charter boats. It is suggested that the hazardrelated decision-making processes of marine establishments and fishing community households need to be further evaluated to improve the overall mitigation process.
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« Benthic Habitats and the Effects of Fishing ». Dans Benthic Habitats and the Effects of Fishing, sous la direction de Jake Rice. American Fisheries Society, 2005. http://dx.doi.org/10.47886/9781888569605.ch4.
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<strong><em>Abstract. </em></strong>This paper first considers why it has been so difficult to make progress on moving fisheries toward ecological sustainability even in the narrow context of the target species. It then reviews the additional challenges that must be confronted when addressing the ecosystem effects of fishing, particularly impacts on benthic communities and habitats. Several impediments to progress are identified, including excess fishing capacity, the differential time courses of costs and benefits in reductions in fishing, myths and preconceptions regarding precaution and the relationship of sustainability to fishery characteristics, and above all, the complexity of the concept of sustainability itself, which has ecological, economic, and social dimensions. It has proven nearly impossible to find management options that do not lose ground on some dimensions in exchange for positive change on others. The paper evaluates the main tools available for reducing the effects of fishing on benthic communities and habitats, with regard to sustainability on all three axes. Four main classes of tools, including changing the cost– benefit accounting to include ecosystem goods and services, marine protected areas, gear modification and fleet substitution, and eco-certification, were all found to incur significant social or economic costs in order to make significant contributions to reducing impacts of fisheries on benthos. Because of the inescapability of trade-offs in decision making, a structured framework is needed for the decisionmaking process. Objectives-based fisheries management provides such a framework, but including benthos (and other ecosystem properties) in the list of objectives presents real challenges in keeping the list tractably short and the individual objectives usefully explicit. Work done by expert groups on approaches to meet these challenges is summarized. Overall, although there are many ecological questions about fishing effects on the benthos that have not yet been fully answered, the more urgent challenges are to find ways to use the knowledge we do have more effectively in decision making.
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Jennings, S., S. S. Marshall, P. Cuet et O. Nairn. « The Seychelles ». Dans Coral Reefs of the Indian Ocean, Their Ecology and Conservation, 383–410. Oxford University PressNew York, NY, 2000. http://dx.doi.org/10.1093/oso/9780195125962.003.0013.
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Abstract The reefs of the Seychelles are among the most extensive in the western Indian bcean. They range from heavily exploited and intermittently polluted fringing reefs on the coasts of the large granitic islands of Mahe, Praslin, and La Digue to isolated atolls such as Aldabra where fishing pressure and pollution levels are low. Reefs may sustain important artisanal fisheries, provide coastal protection and are an important resource for the dive tourism industry. Reefs have been studied in most detail on the granitic islands and Aldabra. Reclamation, sedimentation and eutrophication threaten reefs around the large granitic islands and military development once threatened Aldabra. Approximately 15% of the islands’ reefs now have protected status but it has proved difficult to advance from protection by law to protection in practice (Box 13.1). Nevertheless, the extensive reefs of Seychelles, coupled with a small population have allowed the country to address marine conservation issues which appear insurmountable elsewhere.
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Darwall, William R. T., et Martin Guard. « Tanzania ». Dans Coral Reefs of the Indian Ocean, Their Ecology and Conservation, 131–66. Oxford University PressNew York, NY, 2000. http://dx.doi.org/10.1093/oso/9780195125962.003.0005.
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Abstract The southern coast of Tanzania stretches for 690 km from Dar es Salaam to the Ruvuma River at the Mozambique border and supports one of the finest shallow-water coral reef and estuarine mangrove complexes in East Africa. Extending from Mafia Island to the Songo Songo Archipelago and bordered on the west by the Rufiji River Delta the shallow-water plateau is fringed on its eastern edge by a largely unspoiled outer reef which runs southwards from northern Mafia Island for an estimated 270 km to the Mozambique border (Fig. 5.1). The true extent of the reef, mangrove and seagrass systems and their supported diversities has only recently been revealed largely through the surveys of Frontier-Tanzania, a joint initiative between the University of Dar es Salaam and the Society for Environmental Exploration. These surveys have also highlighted a high degree of local dependence on the associated marine resources which are now suffering from the increasing demands of a rapidly rising coastal population. Overexploitation of these resources, coupled with the introduction of a number of highly destructive fishing techniques, makes the implementation of a management program for the sustainable use of resources a priority within the area.
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McClanahan, Timothy R. « Coral Reef Use and Conservation ». Dans Coral Reefs of the Indian Ocean, Their Ecology and Conservation, 39–80. Oxford University PressNew York, NY, 2000. http://dx.doi.org/10.1093/oso/9780195125962.003.0002.
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Abstract Conservation of coral reefs is primarily concerned with controlling or reducing the levels of fishing or resource extraction and marine pollution. These two factors are considered, by coral reef scientists, to be the main human influences on coral reefs (25). There are, however, a number of other threats to the diversity and function of coral reefs (Table 2.1) but they are less well understood and often uncontrollable at the local or regional level and therefore not amenable to management. For instance, warming of the earth by the burning of fossil and wood fuels may cause the temperature of the oceans to increase beyond a maximum threshold tolerable to corals (10,27) and is, therefore, arguably one of the major threats to the survival of coral reefs. This warming is, however, largely caused by waste emissions from developed countries that do not have coral reefs and is largely ignored or beyond the control of local managers of coral reefs. In contrast, there is mounting evidence that local small-scale fishers are having a major influence on coral reef ecology throughout the tropical oceans and that some of these detrimental effects could be managed or reduced (33). This problem of the scale of threats, their interactions and boundaries, and our recognition of important and manageable threats is an important theme for understanding reef management.
Actes de conférences sur le sujet "Indian Marine Fishing Fleet"
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Giannini, Leonardo, Sepideh Jafarzadeh, Alessandro Campari, Federico Ustolin et Nicola Paltrinieri. « Inspection Planning in the Marine Sector, A Case Study of a Hydrogen-Fueled Fishing Vessel ». Dans ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-100914.
Texte intégralRésumé :
Abstract Inspection planning, maintainability and safety aspects are yet to be consolidated topics of hydrogen technologies in most of their applications, including the marine sector. The implementation of electricity in the marine sector is almost only appealing for ferries, which in many cases have daily access to recharge stations. In addition, the climate roadmap of the Norwegian fishing fleet estimates that a low environmental impact technology can contribute to significantly reduce greenhouse emissions, especially carbon dioxide, by 2030. In fact, considering the longer working sessions of fishing vessels, the additional weight of batteries, and the considerable occupied volume, it is more than reasonable to discuss fuel cells as a possible solution. Against this background, this paper discusses a case study of a hydrogen-fueled fishing vessel, focusing on risk-based inspection (RBI) and maintenance planning as a way to significantly decrease safety-related uncertainties and optimize the associated operations. Different hydrogen-induced degradation mechanisms have been considered to investigate how the existing RBI standards might lead to an underestimation of the risks associated with the equipment selected for the fishing vessel. In addition, a discussion regarding the limitations in the applicability of standard RBI planning with respect to hydrogen technologies is carried out as an overall result, along with the limits of the implemented approach.
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Samaradiwakar, Sujatha. « Law Goes Blue : A Phase towards a Sustainable Marine Life ». Dans SLIIT International Conference on Advancements in Sciences and Humanities 2023. Faculty of Humanities and Sciences, SLIIT, 2023. http://dx.doi.org/10.54389/azvu2267.
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The blue economy concept gained significant momentum in Rio +20, where nations undertook the promise to embark on sustainable blue growth. The overexploitation of ocean resources has brought in a sustainable development crisis, and in response to tackling its challenges has emerged the concept of the Blue Economy, which encompasses the two competing discourses - exploiting the marine resources and ocean sustainability. Blue economy, therefore, offers a fresh approach to conserving the oceans while extracting its benefits equitably and sustainably. In an age where the emphasis is on the green economy, the blue economy tries to bolster it rather than replace it. Sri Lanka, due to its geographical location in the Indian Ocean, is blessed with maritime areas seven times larger than the land area, and it provides one of the frontiers for economic development. Fishing, sea transportation, tourism, seabed mining and minerals are the activities that have immense potential in providing sustainable livelihood. Findings of the existing literature on this topic show that they are not comprehensive nor give sufficient attention to the legislative framework of Sri Lanka in harnessing the emerging concept so as to attain sustainable development. Hence, there is a gap in the existing literature as no study has discussed the legislative and policy framework and the challenges in giving effect to the blue economy. Research Problem includes despite the fact that there are catena of environmental legislation enacted in the idea of protecting and preserving the nature and its riches to which extent the legislations could be utilized to promote the blue economy concept? The purpose of this research paper is to examine the existing legal framework that bolsters the emerging concept of the blue economy and the challenges in protecting the marine ecosystem in the Sri Lankan context. This paper, employing a doctrinal legal research methodology, examines the importance of the blue economy concept to the island as a whole and the legislative initiatives that have been taken by the government to honour the concept of the blue economy while preserving and protecting the marine ecology. To this end, the paper analyses the relevant national legislations and the International Conventions which constitute as primary sources and to a lesser extent the scholarly articles on the concept as secondary sources. The paper concludes that the existing domestic legal framework could be utilized successfully to implement the concept and highlights the fact that the decision-makers and the judiciary should be willing and committed to recognizing the concept and, at the same, time prioritizing the conservation of the marine ecosystem.
Rapports d'organisations sur le sujet "Indian Marine Fishing Fleet"
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Conrad, Jon, Linda Nøstbakken, Steven Stone, Henrik Franklin et César Viteri. Fisheries Management in the Galapagos Marine Reserve : A Bioeconomic Perspective. Inter-American Development Bank, mai 2006. http://dx.doi.org/10.18235/0008751.
Texte intégralRésumé :
Despite numerous efforts and a large investment by the Ecuadorian Government and the international community, fishery management in Galapagos remains highly conflictive and essentially ineffective. Levels of mistrust and lack of communication have eroded the governance mechanisms in place to resolve conflicts over competing uses in the Reserve. In an effort to provide new information and analytical content into the policy debate regarding fisheries management in the marine reserve, the authors of this paper developed this research utilizing an economic approach to regulating use of the primary commercial fisheries in Galapagos. In particular, the objective of this study is to determine the optimal harvest, escapement, and fishing effort for the small-scale fishing fleet of the Galapagos Marine Reserve (GMR). In this study, the focus of attention is the two most important fisheries: the sea cucumber (pepino de mar, or "pepino") and the spiny red lobster. The authors base their analysis on a stochastic discrete time bioeconomic model developed by Reed (1979).