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Effects of Radius and Direction of Semicircular Tow near the Shoreline on Catch of Postlarval Shrimp (Penaeus spp.) with the Renfro Beam Trawl
Author(s) -
Caillouet Charles W.,
Dugas Ronald J.,
Fontenot Bennie J.
Publication year - 1968
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(1968)97[127:eorado]2.0.co;2
Subject(s) - clockwise , shrimp , penaeus , radius , shore , oceanography , fishery , beam (structure) , geology , environmental science , geodesy , biology , rotation (mathematics) , physics , geometry , mathematics , optics , computer security , computer science
Two experiments involving sampling of postlarval shrimp (Penaeus spp.) with the Renfro beam trawl were conducted near the shoreline at Cheniere la Croix, Marsh Island, Louisiana. Each experiment consisted of six treatment combinations of three radii (50, 100, and 150 ft) and two directions (clockwise and counterclockwise) of a semicircular tow of the trawl with each treatment combination replicated six times. Tows of 50 ft radius provided a measure of relative abundance of postlarvae that was no less efficient than measures provided by tows of greater radius. Because catches in clockwise and counterclockwise tows differed in one experiment, it was suggested that no fewer than duplicate semicircular (in opposite directions) tows be taken to sample postlarvae with the beam trawl.