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Relationships between Trawl Catch and Tow Duration for Penaeid Shrimp
Author(s) -
Carothers Paul E.,
Chittenden Mark E.
Publication year - 1985
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1985)114<851:rbtcat>2.0.co;2
Subject(s) - trawling , shrimp , fishery , penaeus , duration (music) , fishing , statistics , fish <actinopterygii> , mathematics , environmental science , biology , physics , acoustics
The relationship between catch and trawling effort was explored for Penaeus aztecus, P. setiferus, and P. duorarum. Tow durations of 5, 10, 15, 20, 25, and 30 min bottom time were examined, and data were analyzed with orthogonal polynomials in a randomized complete block design. We found a significant linear relationship between catch and tow duration, which is consistent with the assumption of a constant catchability coefficient. However, tow duration accounted for only a small proportion of the total variation in catch. This indicates that catch‐per‐unit‐effort indices of abundance may be improved when analyzed in statistical designs that consider other sources of variation in catch in addition to fishing effort. Scaling of catch data when tow durations vary is briefly discussed.