Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean

Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean

Publicación online disponible en: http://www.icm.csic.es/scimar/index.php

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Main Authors: Morales-Nin, Beatriz, Massutí, Enric, Deudero, Salud, Reñones, Olga, Lleonart, Jordi
Format: artículo biblioteca
Language:English
Published: CSIC - Instituto de Ciencias del Mar (ICM) 1999
Subjects:Coryphaena hippurus, Fishery, FADs, VPA,
Online Access:http://hdl.handle.net/10261/5281
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spelling dig-icm-es-10261-52812022-12-20T11:37:05Z Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean Morales-Nin, Beatriz Massutí, Enric Deudero, Salud Reñones, Olga Lleonart, Jordi Coryphaena hippurus Fishery FADs VPA Publicación online disponible en: http://www.icm.csic.es/scimar/index.php The dolphinfish (Coryphaena hippurus) fishery based on the island of Majorca (western Mediterranean) and the population dynamics of the species were studied between 1995 and 1996. Fishing effort, landings and length composition of the catches during the sampling period, as well as the historic catch data series and fleet were analysed. Virtual Population Analysis (VPA), taking as the time unit the week in 1995 and the fortnight in 1996, were also carried out. Dolphinfish is fished from August to December, with main catches in September-October, using anchored fish aggregation devices (FADs) and surrounding net. The mooring areas, placed from 70 to 1200 m depth, are distributed among the boats registered for the year´s fishery. A total of 46 boats took part in this fishery in 1995 and 37 in 1996, with a catch of 128 and 52 metric tons respectively. These wide fluctuations are also shown in the annual catches of the 16year series, which ranged from 2 to more than 120 metric tons, showing a slightly increasing trend (4 tons per year). The comparison of different measures of effort (FADs, days and hours) showed similar values of CPUE, although the number of FADs showed the lowest variation, with normal variances and average values not significantly different between harbours. The length composition of the catches ranged from 20 to 64 cm fork length, which corresponds to juveniles between 2 and 6 months of age. The main results of the VPA, which must be regarded in relative rather than absolute values, showed that the available population and the recruitment in 1995 are greater (around one order of magnitude) than in 1996. For both years, the number of individuals declined in the course of the fishing season, while biomass increased during the first 5 weeks. The fact that the exploited fraction of the dolphinfish population is composed of 0-age class suggests that catch fluctuations might be related to environmental parameters and to the migratory behaviour pattern of the species. These two interrelated factors can produce failures of its annual spawning in the western Mediterranean, and/or of the recruitment of the species to the fishery. This paper is a result of the research projects “Biology and fishery of dolphinfish in the western Mediterranean and Canary Islands area” and “Dolphinfish biological and fishing data in the western Mediterranean”, funded by Directorate General XIV of the European Commission (Refs. 94/031 and 95/73 respectively). Peer reviewed 2008-06-25T07:26:12Z 2008-06-25T07:26:12Z 1999 artículo http://purl.org/coar/resource_type/c_6501 Sci. Mar. 63(3-4): 447-457 0214-8358 http://hdl.handle.net/10261/5281 1886-8134 en open 339782 bytes application/pdf CSIC - Instituto de Ciencias del Mar (ICM)
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic Coryphaena hippurus
Fishery
FADs
VPA
Coryphaena hippurus
Fishery
FADs
VPA
spellingShingle Coryphaena hippurus
Fishery
FADs
VPA
Coryphaena hippurus
Fishery
FADs
VPA
Morales-Nin, Beatriz
Massutí, Enric
Deudero, Salud
Reñones, Olga
Lleonart, Jordi
Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean
description Publicación online disponible en: http://www.icm.csic.es/scimar/index.php
format artículo
topic_facet Coryphaena hippurus
Fishery
FADs
VPA
author Morales-Nin, Beatriz
Massutí, Enric
Deudero, Salud
Reñones, Olga
Lleonart, Jordi
author_facet Morales-Nin, Beatriz
Massutí, Enric
Deudero, Salud
Reñones, Olga
Lleonart, Jordi
author_sort Morales-Nin, Beatriz
title Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean
title_short Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean
title_full Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean
title_fullStr Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean
title_full_unstemmed Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean
title_sort population dynamics and fishery of dolphinfish (coryphaena hippurus) in the western mediterranean
publisher CSIC - Instituto de Ciencias del Mar (ICM)
publishDate 1999
url http://hdl.handle.net/10261/5281
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AT deuderosalud populationdynamicsandfisheryofdolphinfishcoryphaenahippurusinthewesternmediterranean
AT renonesolga populationdynamicsandfisheryofdolphinfishcoryphaenahippurusinthewesternmediterranean
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