Demonstration and Evaluation of the Streak Tube Imaging for Use in Bycatch Reduction PDF Download
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Author: Andrew J. Griffis
Publisher:
ISBN:
Category : Bluefin tuna
Languages : en
Pages : 110
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Book Description
"The Airborne Streak Tube Imaging LIDAR (ASTIL) was evaluated for use in detecting schools of tuna in the Eastern Tropical Pacific (ETP) waters in order to aid in reducing bycatch of dolphin associated with yellowfin tuna. Three airborne experiments were conducted and data were collected for southern bluefin tuna, yellowfin tuna, akule (trachiurops crumenophthalmus), giant bluefin tuna (GBFT) and dolphin. The LIDAR signature of tuna was studied and extended to an evaluation of fish and fish school detection of GBFT using STIL experimental data. The utility of fish school detection was confirmed for GBFT in terms of detection statistics for binary hypothesis testing and also by direct implementation of a three-dimensional matched filter algorithm. Based on the GBFT observations, modeled performance estimates were made for yellowfin in the ETP for an upgraded ASTIL system."--p.11
Author: Andrew J. Griffis
Publisher:
ISBN:
Category : Bluefin tuna
Languages : en
Pages : 110
Get Book Here
Book Description
"The Airborne Streak Tube Imaging LIDAR (ASTIL) was evaluated for use in detecting schools of tuna in the Eastern Tropical Pacific (ETP) waters in order to aid in reducing bycatch of dolphin associated with yellowfin tuna. Three airborne experiments were conducted and data were collected for southern bluefin tuna, yellowfin tuna, akule (trachiurops crumenophthalmus), giant bluefin tuna (GBFT) and dolphin. The LIDAR signature of tuna was studied and extended to an evaluation of fish and fish school detection of GBFT using STIL experimental data. The utility of fish school detection was confirmed for GBFT in terms of detection statistics for binary hypothesis testing and also by direct implementation of a three-dimensional matched filter algorithm. Based on the GBFT observations, modeled performance estimates were made for yellowfin in the ETP for an upgraded ASTIL system."--p.11
Author: World Bank
Publisher: World Bank Publications
ISBN: 0821379143
Category : Technology & Engineering
Languages : en
Pages : 130
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Book Description
'The Sunken Billions: The Economic Justification for Fisheries Reform' shows the difference between the potential and actual net economic benefits from marine fisheries is about $50 billion per year, or some $2 trillion over the last three decades. If fish stocks were rebuilt, the current marine catch could be achieved with approximately half the current global fishing effort. This illustrates the massive overcapacity of the global fleet. The excess competition for the limited fish resources results in declining productivity, economic inefficiency, and depressed fisher incomes. The focus on the deteriorating biological health of world fisheries has tended to obscure their equally critical economic health. Achieving sustainable fisheries presents challenges not only of biology and ecology, but also of managing political and economic processes and replacing pernicious incentives with those that foster improved governance and responsible stewardship. Improved governance of marine fisheries could regain a substantial part of this annual economic loss and contribute to economic growth. Fisheries governance reform is a long-term process requiring political will and consensus vision, built through broad stakeholder dialogue. Reforms will require investment in good governance, including strengthening marine tenure systems and reducing illegal fishing and harmful subsidies. Realizing the potential economic benefits of fisheries means reducing fishing effort and capacity. To offset the associated social adjustment costs, successful reforms should provide for social safety nets and alternative economic opportunities for affected communities.
Author: United States. Congress. House. Committee on Resources. Subcommittee on Fisheries Conservation, Wildlife, and Oceans
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 108
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Book Description
Author: Edward F. Melvin
Publisher: Alaska Sea Grant College Program
ISBN:
Category : Nature
Languages : en
Pages : 224
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Book Description
Seabird Bycatch significantly adds to the knowledge base of seabird mortality in commercial fisheries, and emphasizes the importance of comprehensive solutions. The product of a 1999 symposium held by the Pacific Seabird Group, Seabird Bycatch is a response to escalating bycatch, a global conservation and fisheries management issue.
Author: Alessandro Lucchetti
Publisher: Frontiers Media SA
ISBN: 2832532608
Category : Science
Languages : en
Pages : 330
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Book Description
Over the last fifty years, human exploitation of marine resources has become more efficient as the understanding of the habits and behaviour of the various species available in the sea gradually increased. Thus, technologies have developed naturally over time and fishing gears and practices have become more sophisticated. These technical advances in fishing gear have generally led to more efficient economic fishing operations and better access to resources. However, fishing implies the harvesting of marine organisms directly from their natural environment, therefore general awareness of environmental problems due to the exploitation of fishery resources has also increased. In particular, the poor selectivity of some gears is responsible for the capture of juveniles, immature and undersized specimens of many species, with negative consequences on the state of stocks. In addition, bycatch in marine fisheries is a major source of human-caused mortality of marine megafauna, often leading to the capture of vulnerable species. Finally, many bottom-towed gears are responsible for high impacts on bottom communities and habitats, with cascading consequences on the entire marine ecosystem. All these impacts can lead to changes in the structure, function and integrity of ecosystems, including effects on the food webs and multispecies predator-prey relationships.
Author: Kieran Kelleher
Publisher: Food & Agriculture Org.
ISBN: 9789251052891
Category : Business & Economics
Languages : en
Pages : 156
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Book Description
This publication gives an updated review of the quantity of discards in the world's marine fisheries, using information from a broad range of fisheries in all continents. A number of policy issues are discussed including a 'no discards' approach to fisheries management, the need for balance between bycatch reduction and bycatch utilisation initiatives, and concerns arising from incidental catches of marine mammals, birds and reptiles. The report also highlights the need for more robust methods of estimating discards, and the development of bycatch management plans.
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9789251045411
Category : Business & Economics
Languages : en
Pages : 20
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Book Description
The actual Code of conduct is also available (1996) (ISBN 9251038341).
Author: Sacchi, J.
Publisher: Food & Agriculture Org.
ISBN: 9251345392
Category : Technology & Engineering
Languages : en
Pages : 136
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Book Description
Potentially harmful contact between fisheries and marine vulnerable species represents a global conservation issue and efforts to mitigate the negative repercussions of these interactions belong in strategies for ensuring the sustainability of fisheries. This literature review offers a survey of mitigation measures and techniques that have been developed and tested around the world, aiming to address both the incidental catch of highly mobile species – specifically, cetaceans, seabirds, sharks and rays, and sea turtles – and depredation caused by dolphins. Based on research detailed in over 300 documents, including peer-reviewed publications, reports from international organizations and papers available on the internet, most of the mitigation techniques illustrated are still under development, with only a few already adopted through legislation. The selected mitigation measures are grouped by main types of fishing gear – gillnets and trammel nets, longlines and lines, trawls, purse seines, traps and pots – and further subdivided according to which of the four main groups of vulnerable species – cetaceans, seabirds, sharks and rays, or sea turtles – they are designed to protect. Preventive and curative approaches covering both technical measures (gear modifications, strategies, as well as acoustic, visual, magnetic and chemosensory deterrents) and management measures are described.
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 714
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Book Description
Author: FAO
Publisher: Food and Agriculture Organization of the United Nations
ISBN: 9251326924
Category : Technology & Engineering
Languages : en
Pages : 224
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Book Description
The 2020 edition of The State of World Fisheries and Aquaculture has a particular focus on sustainability. This reflects a number of specific considerations. First, 2020 marks the twenty-fifth anniversary of the Code of Conduct for Responsible Fisheries (the Code). Second, several Sustainable Development Goal indicators mature in 2020. Third, FAO hosted the International Symposium on Fisheries Sustainability in late 2019, and fourth, 2020 sees the finalization of specific FAO guidelines on sustainable aquaculture growth, and on social sustainability along value chains. While Part 1 retains the format of previous editions, the structure of the rest of the publication has been revised. Part 2 opens with a special section marking the twenty fifth anniversary of the Code. It also focuses on issues coming to the fore, in particular, those related to Sustainable Development Goal 14 and its indicators for which FAO is the “custodian” agency. In addition, Part 2 covers various aspects of fisheries and aquaculture sustainability. The topics discussed range widely, from data and information systems to ocean pollution, product legality, user rights and climate change adaptation. Part 3 now forms the final part of the publication, covering projections and emerging issues such as new technologies and aquaculture biosecurity. It concludes by outlining steps towards a new vision for capture fisheries. The State of World Fisheries and Aquaculture aims to provide objective, reliable and up-to-date information to a wide audience – policymakers, managers, scientists, stakeholders and indeed everyone interested in the fisheries and aquaculture sector.
