NDLI: Selectivity and efficiency of two otter trawls used to assess estuarine fish and macroinvertebrate populations in North Carolina

Content Provider	Springer Nature Link
Author	Stokesbury, Kevin D. E. Bichy, John B. Ross, Steve W.
Copyright Year	1999
Abstract	Otter trawl surveys are frequently used to assess estuarine fish and macroinvertebrate communities. Although these surveys may have similar objectives and sampling areas and seasons may overlap, the sampling gear is usually unique to the agency conducting the survey. An example of this is the North Carolina Division of Marine Fisheries (NCDMF) and Environmental Monitoring and Assessment Program-Estuaries (EMAP) surveys in North Carolinian estuaries. We estimated experimentally the selectivity and efficiency of the trawls used for these surveys to determine the comparability of data used to estimate community structure and the abundance of dominant species. The catch percent similarity of the trawls was low (12.0%). The NCDMF net (3.2-m flat otter trawl, 6.4-mm mesh body, 3.2-mm cod-end, plus tickle chain) precisely (11.7%) and accurately (4.5%) sampled brown shrimp, Penaeus aztecus, density but overestimated spot, Leiostomus xanthurus, densities (22.8% accuracy), possibly because these fishes had highly contagious distributions. The EMAP net (4.9-m high-rise otter trawl, 38.1-mm mesh body and cod-end) was precise (17.9–37.4%) but inaccurate (76.8–97.2%), probably because of the single large mesh size and the lack of a tickler chain. Our study suggests the EMAP and NCDMF surveys collect different subsamples of the same fish and macroinvertebrate estuarine populations, and therefore could deliver different results and conclusions.
Starting Page	882
Ending Page	888
Page Count	7
File Format	PDF
ISSN	01608347
Journal	Estuaries
Volume Number	22
Issue Number	4
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Environment Ecology Earth Sciences Freshwater & Marine Ecology Environmental Management Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Aquatic Science Environmental Science

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