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Author: Steven E. Campana
Publisher: Food & Agriculture Organization of the UN (FAO)
ISBN:
Category : Nature
Languages : en
Pages : 56
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Book Description
Age information is an essential component in growth rate, mortality rate and productivity calculations, hence it is classified among the most influential of biological variables. In this manual, the most recognized age determination methods for elasmobranchs have been brought together so as to provide a detailed and hands-on guide to successful and validated methods for ageing sharks, skates and rays. Particular emphasis is given to vertebral sections and image analysis techniques as applied to elasmobranch species from the Mediterranean Sea, suited to both novice and experienced age readers.
Author: Steven E. Campana
Publisher: Food & Agriculture Organization of the UN (FAO)
ISBN:
Category : Nature
Languages : en
Pages : 56
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Book Description
Age information is an essential component in growth rate, mortality rate and productivity calculations, hence it is classified among the most influential of biological variables. In this manual, the most recognized age determination methods for elasmobranchs have been brought together so as to provide a detailed and hands-on guide to successful and validated methods for ageing sharks, skates and rays. Particular emphasis is given to vertebral sections and image analysis techniques as applied to elasmobranch species from the Mediterranean Sea, suited to both novice and experienced age readers.
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9251311765
Category : Technology & Engineering
Languages : en
Pages : 196
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Book Description
This handbook provides guidance on methods for use in fish ageing studies. Fish age, among other biological parameters, is one of the most relevant pieces of data to attain sustainable exploitation levels of fishery resources. Indeed, most analytical methods used in stock assessment require knowledge of demographic structure according to age of stocks, as well as to recruitment, growth, maturity, natural mortality, etc., which are strictly linked to information on age and age structure. The handbook was put together to deal with identified gaps – which affect both the precision and the accuracy of estimations – regarding ageing schemes, criteria and methodologies used in preparing calcified structures. It focuses on the general principles that underpin age analysis (assignment of birth date, preparation methods, aging scheme reading and identification of true and false rings). Crucially, it aims to contribute to the establishment of common analysis methods, which can enable better calibration across the diverse institutes involved, thereby improving the quality and reliability of results.
Author:
Publisher: Academic Press
ISBN: 0128118326
Category : Science
Languages : en
Pages : 258
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Book Description
Northeast Pacific Shark Biology, Research and Conservation, Part A, Volume 77 highlights the biological attributes of, and the conservation efforts targeted at, populations of vulnerable sharks in the Northeastern Pacific Ocean bordering the west coast of the United States, one of the most economically and ecologically important oceanic regions in the world. Updates in this new volume include chapters on Biodiversity, Conservation and Life History of Northeastern Pacific Chondrichthyans, a Review of current genetic analyses of Northeast Pacific sharks and conservation implications, and a section on the Trophodynamics and ecological impacts of eastern North Pacific sharks. - Brings together subject experts on all aspects of shark biology, ecology, fishery management and conservation - Summarizes current knowledge - Focuses scientific attention on key issues embedded in the concept of shark conservation, both from a species and an ecosystem perspective
Author: Mohamed Nejmeddine Bradai
Publisher: Food & Agriculture Organization of the UN (FAO)
ISBN:
Category : Nature
Languages : en
Pages : 124
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Book Description
In many fisheries they are, however, often landed and marketed.
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 56
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Book Description
Author: III, William Hunter
Publisher: CRC Press
ISBN: 1466562005
Category : Science
Languages : en
Pages : 308
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Book Description
This title includes a number of Open Access chapters.Fisheries management and conservation draws on science in order to find ways to protect fishery resources so sustainable exploitation is possible. Modern fisheries management often involves regulating when, where, how, and how much fishermen are allowed to harvest to ensure that there will be fis
Author: Sarah L. Fowler
Publisher: IUCN
ISBN: 9782831706504
Category : Chondrichthyes
Languages : en
Pages : 282
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Book Description
The Darwin Elasmobranch Biodiversity Conservation and Management project in Sabah held a three-day international seminar that included a one-day workshop in order to highlight freshwater and coastal elasmobranch conservation issues in the region and worldwide, to disseminate the result of the project to other Malaysian states and countries, and to raise awareness of the importance of considering aspects of elasmobranch biodiversity in the context of nature conservation, commercial fisheries management, and for subsistence fishing communities. These proceedings contain numerous peer-reviewed papers originally presented at the seminar, which cover a wide range of topics, with particular reference to species from freshwater and estuarine habitats. The workshop served to develop recommendations concerning the future prospects of elasmobranch fisheries, biodiversity, conservation and management. This paper records those conclusions, which highlight the importance of elasmobranchs as top marine predators and keystone species, noting that permanent damage to shark and ray populations are likely to have serious and unexpected negative consequences for commercial and subsistence yields of other important fish stocks.
Author: General Fisheries Commission for the Mediterranean (Food and Agriculture Organization of the United Nations)
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 118
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Book Description
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9789251054031
Category : Business & Economics
Languages : en
Pages : 264
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Book Description
Elasmobranch - describes a group of fish without a hard bony skeleton, including sharks, skates, and rays.
Author: General Fisheries Commission for the Mediterranean (Food and Agriculture Organization of the United Nations). Scientific Advisory Committee. Session
Publisher: Food & Agriculture Organization of the UN (FAO)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 248
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Book Description
The scientific Advisory Committee (SAC) of the General Fisheries Commission for the Mediterranean (GFCM) held its fifteen session in Rome, from 8 to 11 April 2013. The Committee reviewed the issues addressed at the eight technical meetings, including the four sessions of its subcommittees, and at the workshops held during the 2012-2013 intersession.
