Cruise No 1/95 First version - Studies of survey methodology for hake, 16 January - 19 February 1995
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Institute of Marine Research, Bergen ;
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The main objective of the gear experiments under Part I is to study the effective fishing width of the standard bottom trawl for hake. Experiments will be made with different sweep lengths to study herding effects. Observations of possible escapement over the headline will be attempted. Required experimental conditions include reasonably good catch rates, good range of fish size and favorable bottom conditions. SCANMAR instruments will be used for monitoring and all catches will be measured and sampled. If a main part of the hake lifts from the bottom at night, target strength measurements will be attempted and "acoustic density" and "swept area density" compared. A further objective is to test and possibly calibrate the new type of otter board against the standard type. These tests must include different depths and other fishing conditions. Studies will also be made of the large mid water trawl fishing for pelagic hake.