Seasonal and Long-Term Changes in the Distribution and Abundance of Demersal Fishery Resources in Continental Shelf Waters off Ghana, West Africa

Seasonal and Long-Term Changes in the Distribution and Abundance of Demersal Fishery Resources in Continental Shelf Waters off Ghana, West Africa

23pp.

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Bibliographic Details
Main Author: Koranteng, K.A.
Format: Journal Contribution biblioteca
Language:English
Published: 2001
Subjects:Demersal fisheries, Trawls, Fishery surveys,
Online Access:http://hdl.handle.net/1834/241
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id dig-aquadocs-1834-241
record_format koha
spelling dig-aquadocs-1834-2412021-05-19T06:14:56Z Seasonal and Long-Term Changes in the Distribution and Abundance of Demersal Fishery Resources in Continental Shelf Waters off Ghana, West Africa Changes in the demersal fishery resources of Ghana Koranteng, K.A. Demersal fisheries Trawls Fishery surveys 23pp. Between 1963 and 1990, the abundance of demersal fishery resources in Ghana’s shelf waters underwent significant changes whereby the relative importance of major species changed in every trawl survey conducted in the area. Triggerfish (Balistes capriscus) dominated this ecosystem for nearly twenty years (from early 1970s to late 1980s) displacing bigeye grunt (Brachydeuterus auritus) as the most abundant species.The density of all demersal species (excluding triggerfish) assessed in bottom trawl surveys decreased from 50 kg ha-1 in 1963-64 to 32.4 kg ha-1 in 1990. The lowest density of 22.5 kg ha-1 occurred between 1973 and 1977. Density of triggerfish was high between 1973 and 1982, reaching a value of 28 kg ha-1 between depths of 30 and 50 m. Its density subsequently declined and by 1990, the species had virtually disappeared from the study area. In the period of decline of triggerfish, the density of rays, soles and cuttlefish increased.The observed changes in relative importance and density of species is attributed in part to the proliferation of the triggerfish in this ecosystem and also to changes in the marine climate over the period in question. Published Triggerfish, Demersal species, Shelf ecosystem, Density 2005-05-31T13:47:33Z 2005-05-31T13:47:33Z 2001 Journal Contribution Non-Refereed Article http://hdl.handle.net/1834/241 en 144357 bytes application/pdf
institution UNESCO
collection DSpace
country Francia
countrycode FR
component Bibliográfico
access En linea
databasecode dig-aquadocs
tag biblioteca
region Europa del Oeste
libraryname Repositorio AQUADOCS
language English
topic Demersal fisheries
Trawls
Fishery surveys
Demersal fisheries
Trawls
Fishery surveys
spellingShingle Demersal fisheries
Trawls
Fishery surveys
Demersal fisheries
Trawls
Fishery surveys
Koranteng, K.A.
Seasonal and Long-Term Changes in the Distribution and Abundance of Demersal Fishery Resources in Continental Shelf Waters off Ghana, West Africa
description 23pp.
format Journal Contribution
topic_facet Demersal fisheries
Trawls
Fishery surveys
author Koranteng, K.A.
author_facet Koranteng, K.A.
author_sort Koranteng, K.A.
title Seasonal and Long-Term Changes in the Distribution and Abundance of Demersal Fishery Resources in Continental Shelf Waters off Ghana, West Africa
title_short Seasonal and Long-Term Changes in the Distribution and Abundance of Demersal Fishery Resources in Continental Shelf Waters off Ghana, West Africa
title_full Seasonal and Long-Term Changes in the Distribution and Abundance of Demersal Fishery Resources in Continental Shelf Waters off Ghana, West Africa
title_fullStr Seasonal and Long-Term Changes in the Distribution and Abundance of Demersal Fishery Resources in Continental Shelf Waters off Ghana, West Africa
title_full_unstemmed Seasonal and Long-Term Changes in the Distribution and Abundance of Demersal Fishery Resources in Continental Shelf Waters off Ghana, West Africa
title_sort seasonal and long-term changes in the distribution and abundance of demersal fishery resources in continental shelf waters off ghana, west africa
publishDate 2001
url http://hdl.handle.net/1834/241
work_keys_str_mv AT korantengka seasonalandlongtermchangesinthedistributionandabundanceofdemersalfisheryresourcesincontinentalshelfwatersoffghanawestafrica
AT korantengka changesinthedemersalfisheryresourcesofghana
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