Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 274 pages
File Size : 42,19 MB
Release : 2019-04-15
Category : Technology & Engineering
ISBN : 9251311722
This atlas aims to present sound approaches to maturity sampling for a wide range of Mediterranean species – including bony fish, cartilaginous fish, both oviparous and viviparous, crustaceans and cephalopods – based on an accurate determination of the different maturity stages. It includes macroscopic photos of gonads belonging to the main species and, for some, a validation-based histological analysis.
Author : Maria Cristina Follesa
Publisher :
Page : 0 pages
File Size : 18,16 MB
Release : 2019
Category : Fish stock assessment
ISBN :
"Maturity is one of the most relevant biological parameters used in stock assessment programmes. Indeed, the macroscopic stage of gonadal development is an essential feature in estimating the maturity ogive and spawning stock biomass (SSB). It is also useful for determining the spawning season of a species and for monitoring long-term changes in the spawning cycle, as well as for many other research needs related to the biology of fish. In current data collection programmes carried out in the Mediterranean which cover extensive samplings of maturity stages, some specific technical aspects have not always been taken into consideration, and collected data cannot reach the required precision levels. Also, the coding schemes in use and the uncertainty in the interpretation of particular stages can give rise to misinterpretations of the actual maturity stage leading to inaccurate spawning stock biomass estimations. Several stock assessments are therefore based on time-invariant maturity ogives and only partially cover the spatial distribution of the stocks. Hence, on several occasions, the need has been expressed to improve the identification of the macroscopic maturity stages through a standardization of operational procedures and terminology. One of the solutions for overcoming these problems was to formalize an atlas of the macroscopic and histological maturity stages of the main species of commercial interest in the Mediterranean. In this context, this atlas aims to develop sound approaches to maturity sampling for a wide range of species, based on an accurate and precise determination of the different maturity stages. It includes macroscopic photos of gonads belonging to the main species, and for some of them, a validation-based histological analysis is also presented. The systematic categories investigated in the atlas are bony fish, cartilaginous fish, both oviparous and viviparous, crustaceans and cephalopods."--Publisher's description
Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 338 pages
File Size : 34,50 MB
Release : 2019-02-19
Category : Technology & Engineering
ISBN : 9251311366
This volume includes all the abstracts of the keynotes, oral contributions and posters presented by participants on the occasion of the Forum on Fisheries Science in the Mediterranean and the Black Sea (Fish Forum 2018). Organized by the GFCM at FAO headquarters, Rome, Italy, from 10 to 14 December 2018, in collaboration with technical partners, the Fish Forum 2018 is a first-of-the-kind event gathering scientists, researchers, engineers, academics, practitioners, managers and decision-makers from around the world to discuss and share knowledge on the latest developments in fisheries science. The material contained in this book of abstracts stems from the contributions received from participants and selected by an international scientific committee based on their technical quality and relevance. The abstracts are subdivided according to the three main themes of the Fish Forum 2018: Better science for better advice; Healthy seas and sustainable fisheries; and Economic analysis and technology for societal benefit. Each theme is introduced by a keynote presentation, followed by oral presentations and posters. These documents form the basis of the discussions held during parallel sessions and poster sessions of the Fish Forum 2018.
Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 96 pages
File Size : 17,65 MB
Release : 2019-09-03
Category : Technology & Engineering
ISBN : 9251315388
Discards – the part of the catch that is not retained on board, which may include target species or any other (commercial and non-commercial) species that are returned at sea dead or alive – usually result in a reduction of harvesting opportunities and may have negative consequences on the stocks, ecosystems and the marine environment. In the Mediterranean and the Black Sea, studies on discards only cover a small portion of the total fishing activities and discard rates are often poorly estimated or totally unknown. Information is lacking for many types of fishing gear, countries and GFCM subregions, and most available studies only cover relatively short periods and small areas. Discards therefore represent a major source of uncertainty about the actual fishing mortality rates of stocks. These knowledge gaps highlight the need to expand discard monitoring programmes and standardize practices, so to assess discards appropriately and address their important impacts. This publication and the methodology discussed herein aim to provide a framework for the development and implementation of an efficient, standardized data collection and monitoring system for discards through on-board observations, questionnaires at landing sites and self-sampling activities. It ensures minimum common standards for the collection of discards data and allows for repeatability and comparisons among fisheries across the region, thus offering a harmonized basis of knowledge, information and evidence for decision-making.
Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 108 pages
File Size : 38,90 MB
Release : 2020-05-01
Category : Technology & Engineering
ISBN : 9251325553
In the Mediterranean and the Black Sea, the assessment of demersal stocks mainly relies on scientific surveys (bottom and beam trawl) while the assessment of pelagic stocks is essentially based on acoustic surveys using acoustic techniques with mid-water trawling. These routine surveys-at-sea provide essential information, which in turn are crucial to fine-tune the assessments of the status of resources and to estimate more precisely indicators at the population and fish community levels. However, survey practices differ from one subregion to another, each approach having its own strengths and limitations. In addition, there is still a lack of large-scale standardized surveys aimed at analysing the diversity and distribution of the main demersal and pelagic species across the Mediterranean and the Black Sea. One way of tackling this issue is to carry out international scientific surveys covering the main demersal and pelagic stocks based on a common methodology. The methodology presented in this publication aims at supporting the planning and implementation of regional demersal (bottom and beam) trawl and pelagic acoustic surveys. It can be useful for the implementation of new surveys-at-sea in areas where demersal trawl and pelagic acoustic surveys are not regularly carried out. It can also contribute to increasing comparability between existing surveys thanks to the standardization of methods, sampling of catches and data recording and analysis. Finally, it represents a valuable tool to define minimum requirements towards sustainability and management objectives at the regional and subregional level.
Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 183 pages
File Size : 38,29 MB
Release : 2019-10-29
Category : Technology & Engineering
ISBN : 9251318891
This report presents the outcomes of the twenty-first session of the Scientific Advisory Committee on Fisheries (SAC) of the General Fisheries Commission for the Mediterranean (GFCM) held in Cairo, Egypt, from 24 to 27 June 2019. During the session, the Committee reviewed the work carried out during the 2018–2019 intersession, including within its four subregional subsidiary bodies. Ce rapport présente les résultats de la vingt et unième session du Comité scientifique consultatif des pêches (CSC) de la Commission générale des pêches pour la Méditerranée (CGPM) tenue au Caire, Égypte, du 24 au 27 juin 2019. Au cours de la session, le Comité a passé en revue les travaux réalisés pendant la période intersessions 2018-2019, notamment dans le cadre de ses quatre organes subsidiaires sous-régionaux.
Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 202 pages
File Size : 25,15 MB
Release : 2020-04-01
Category : Technology & Engineering
ISBN : 9251323364
The forty-third session of the General Fisheries Commission for the Mediterranean (GFCM) and the tenth session of the Committee on Administration and Finance were attended by delegates of 19 contracting parties, as well as of three cooperating non-contracting parties and two non-contracting parties. Representatives from 13 intergovernmental and non-governmental organizations, the Food and Agriculture Organization of the United Nations and its regional projects, as well as the Bureaus of the Commission and its subsidiary bodies, were also in attendance. During the session, progress in activities related to fisheries, aquaculture, compliance and other strategic activities was reviewed. Moreover, the outcomes of the second GFCM performance review were commented. In relation to the management of fisheries and aquaculture in the GFCM area of application, eight binding recommendations were adopted, dealing with the following issues: the use of anchored fish aggregating devices in common dolphinfish fisheries in the Mediterranean Sea, information on access agreements in the GFCM area of application, the establishment of a list of vessels presumed to have carried out illegal, unreported and unregulated fishing in the GFCM area of application, the sustainable exploitation of blackspot seabream in the Alboran Sea and red coral in the Mediterranean Sea, multiannual management plans for turbot fisheries in the Black Sea and sustainable demersal fisheries in the Adriatic Sea, and management measures for sustainable trawl fisheries targeting giant red shrimp and blue and red shrimp in the Strait of Sicily. Furthermore, the Commission discussed issues related to the mandate of the GFCM Executive Secretary.
Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 84 pages
File Size : 36,14 MB
Release : 2021-04-08
Category : Social Science
ISBN : 9251341613
FAO’s major publications series are presented together in a user-friendly catalogue. The catalogue features all of the most active series, both new and long-standing, and is divided into areas of work, including agriculture, forestry, fisheries, trade and investment, among others. Each series entry includes technical specifications, language versions, most recent titles, relevant ISSNs, and QR codes linking to online resources in the FAO Document Repository.
Author : Giuseppe Scarcella
Publisher : Frontiers Media SA
Page : 294 pages
File Size : 13,8 MB
Release : 2023-04-10
Category : Science
ISBN : 283252009X
Author : Henk J.L. Heessen
Publisher : BRILL
Page : 572 pages
File Size : 25,44 MB
Release : 2023-09-14
Category : Business & Economics
ISBN : 9086868789
The atlas presents a unique set of abundance data to describe the spatial, depth, size, and temporal distribution of demersal and pelagic fish species over an extensive marine area, together with accounts of their biology. A large number of pictures, graphs and distribution maps illustrate the text. By largely avoiding - or at least explaining - scientific terms and providing extensive references, the book should be useful for both laymen and scientists. The quantitative information on some 200 fish taxa is derived from 72,000 stations fished by research vessels during the period 1977-2013. The area covers the northwest European shelf from west of Ireland to the central Baltic Sea and from Brittany to the Shetlands. Although the surveys extend beyond the shelf edge, only taxa reported at least once in waters less than 200 m are included. Typical deep-water species and typical fresh-water species are excluded. We hope this publication will contribute to gaining a better understanding of the ocean ecosystems.
