Catchability variation in short beam trawl hauls

Warburton K. (1989) Catchability variation in short beam trawl hauls. Fisheries Research, 7 1-2: 55-63. doi:10.1016/0165-7836(89)90006-4

Author Warburton K.
Title Catchability variation in short beam trawl hauls
Journal name Fisheries Research   Check publisher's open access policy
ISSN 0165-7836
Publication date 1989-01-01
Sub-type Article (original research)
DOI 10.1016/0165-7836(89)90006-4
Volume 7
Issue 1-2
Start page 55
End page 63
Total pages 9
Subject 1104 Complementary and Alternative Medicine
Abstract A 3-m beam trawl was used to sample a soft-bottom nektobenthic assemblage over a range of towing distances up to 80 m. Catch-distance curves for 5 of the 6 most abundant species were clearly upwardly concave, catch per unit effort being relatively high over the shorter distances. Stabilised catchability equations were calculated for each species, describing a linear catch-effort relationship over the longer towing distances. By reference to these equations, indices of relative towing-capture efficiency and relative capture efficiency during the trawl recovery phase were calculated. There were close similarities in the rankings of the 6 species according to these indices and by the efficiency of capture during slow drifting (as opposed to active trawling), the combined order (by decreasing efficiency) being as follows: Penaeus esculentus, Paramonacanthus otisensis, Portunus pelagicus, Apogon fasciatus, Pelates quadrilineatus, Leiognathus moretoniensis. Although less clear, species having high capture efficiency tended to be those where the catchability stabilisation distance was low. The results are discussed in terms of trawl speed, reaction distances, mobility and the known habits of species. Relative capture efficiency varied greatly (from 8-34% in Leiognathus to 55-74% in Penaeus) and the implications of this degree of catchability variation are also discussed.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
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