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Intraspecific aggregation structure of a shoal of a Western Mediterranean (Catalan coast) deep-sea shrimp, Aristeus antennatus (Risso, 1816), during the reproductive period

AuthorsSardà, Francisco ; Company, Joan B. ; Castellón, Arturo
Issue DateSep-2003
PublisherNational Shellfisheries Association
CitationJournal of Shellfish Research 22(2): 569-579 (2003)
AbstractThe deep-sea rose shrimp, Aristeus antennatus, constitute an important fishery resource in the Western Mediterranean Sea. The spatio-temporal behavioral pattern of A. antennatus is well-known, with the species forming seasonal aggregations on the middle slope at depths between 400 and 900 m. These aggregations form between late winter and early summer. The object of the present study is to determine the internal structure of shoals of the western Mediterranean (Catalan coast) rose shrimp along the slope on the grounds where the species is fished (from 400 to 1000 m) at the time of peak density during the reproductive period. Interactions between fishing and research vessel have been used to sample synchronically and bathymetrically the shoals of the deep-sea shrimp to determine intra and interspecific shoal structures. The results of this study on A. antennatus have specifically shown that (1) The pattern shrimp shoal distribution is such that density rises rapidly in the portion located in the shallower distribution range of this species and then gradually decreases at greater depths; (2) the distribution of this resource straddles both sides of the ecological boundary located at 900 m, though with changes in the sex-ratio and individual size; (3) species coexisting with this shrimp species are concentrated at depths other than the depths of peak shrimp density; (4) commercial trawlers deploy according to the abundance pattern of the resource; and (5) the reproductive portion of the stock is heavily exploited
Description11 pages, 11 figures, 3 tables
Identifiersissn: 0730-8000
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