Research Document - 2014/024
Modifications to the Campelen 1800 Shrimp Survey Trawl
By T.D. Siferd and G. Legge
Abstract
Initial Northern Shrimp Research Foundation (NSRF)–Fisheries and Oceans Canada (DFO) bottom trawl surveys conducted using the standard Campelen 1800 survey trawl in the new Resolution Island survey area of eastern Hudson Strait experienced a high tear-up rate. This was costly both in time and maintenance, but most importantly affected survey coverage and results. The standard Campelen trawl needed modifications for efficient sampling in this survey area. Modifications considered were increasing the diameter of the footgear, floating the fishingline, adding floatation along lower belly panel seams and putting a restrictor strap on the warps. These modifications, except for the restrictor strap, were tested in a flume tank to observe their effect on trawl geometry and to adjust the floatation on the footgear to reduce sinking in mud but still maintain bottom contact. Results of the testing and final configuration of the trawl are presented. The 21” footgear with 47 floats on the fishingline and float line along the first and second bellies seam line were put into practice in the 2008 and 2009 surveys. Tear-ups caused by bottom contact were reduced to zero with these modifications in place.
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