DocumentCode :
2943427
Title :
Selectivity Experiments with Square Mesh Cod-Ends on Haddock and Cod
Author :
Cooper, C.G. ; Hickey, W.M.
Author_Institution :
Department of Fisheries and Oceans, Fisheries Development Branch, Halifax, Nova Scotia, Canada
fYear :
1987
fDate :
Sept. 28 1987-Oct. 1 1987
Firstpage :
608
Lastpage :
613
Abstract :
During May 1987, comparative fishing trials were carried out by the Fisheries Development Branch to document the benefits of square mesh cod-ends on immature haddock and cod stocks. Three sizes of mesh were used; 121mm square, 130mm square and 130mm diamond. The trials were intended to be carried out using covered cod-ends but inspection with the underwater video camera, Mermaid Explorer, showed that the covers were collapsing on the cod-ends inhibiting escapement. In consequence, the trials reverted to using a trouser trawl with square mesh cod-ends on one side and diamond mesh on the other. A total of 51 valid sets were made and the results show that an equivalent size square mesh reduces the total catch by about 25% while giving higher 50% retention lengths and selection factors. A comparison was also made of the differences between day and night tows.
Keywords :
Cameras; Frequency; Marine animals;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
OCEANS '87
Conference_Location :
Halifax, NS, Canada
Type :
conf
DOI :
10.1109/OCEANS.1987.1160833
Filename :
1160833
Link To Document :
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