期刊名称：Fisheries Centre Research Reports / University of British Columbia
印刷版ISSN：1198-6727
出版年度：2007
卷号：15
页码：139-139
出版社：University of British Columbia
摘要：Data on Catch per Unit Effort (CPUE, here as catch¡¤day-1) for a large number of species for 21 stations
throughout the Greek Seas have been collected by the Institute of Marine Biology of Crete (IMBC) since the
second half of 1995. In the present study we analyzed the total catch¡¤day-1 for various gears for the 1996-2000
period using univariate (K-dominance curves, diversity indices) and multivariate techniques (cluster and
multidimensional scaling). The following vessel size groups for each main gear were considered for analysis:
(a) trawlers smaller and larger than 20 m; (b) purse-seiners smaller and larger than 15 m; (c) beach-seiners;
(d) long liners smaller and larger than 10 m; (e) netters smaller and larger than 10 m; and (f) ¡°other gears¡±.
The mean percentage of vessels sampled ranged from 4.1 to 40.6% for trawlers, 6.5 to 66.4% for purse seiners,
2.1 to 4.6% for beach seiners, 2.2 to 11.8% for longliners, 1.3 to 5.1% for netters and 1.9 to 6.3% for other
coastal boats. Collected data were also aggregated for five fishing subareas: North Aegean, Central Aegean,
South Aegean, Cretan waters and Ionian Sea. The results of the univariate and multivariate analyses were in
close agreement and suggested that the different gear/vessel-size/subarea combinations might generally
be grouped into clusters corresponding to the different gears, irrespectively of subarea. The gears differed
considerably with regard to species composition, species diversity and catch rates. The results also showed
that despite the gear-related definition of groups, among-gear overlap was considerable. This emphasises
the multigear nature of Greek fisheries.
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