Publisher's Synopsis
Excerpt from Fishes Collected by Midwater Trawls During Two Cruises of the David Starr Jordan in the Northeastern Pacific Ocean, April-June and September-October, 1972
Comparison of the 1k and the MT trawls is complicated by the much larger mouth and mesh size of the latter. On 7210-jd, 16 sample pairs were taken. The MT trawls fished to an average depth of 430m and filtered an average of 1,045,500m3 of water whereas the 1k fished to an average depth of 234m and filtered an average of 9,830m3. The MT collected an average of fish per lom3 whereas the 1k collected an average of fish per 10m3. The smaller catch rate of the MT can be attributed to the escapement of small fish through the larger mesh. No relation was found between the number of fish collected by each trawl at the same station. In spite of the lower catch rate per volume of water filtered, the larger samples and larger sizes of fish collected by this net make it a valuable survey tool.
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