Evaluation of trawls for monitoring and harvesting fish populations in Lake Oahe, South Dakota
Technical Paper
76
Out-of-print
By: William R. Nelson and Marvin S. Boussu
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Abstract
Trawls of various designs and sizes were compared to evaluate their use for monitoring and harvesting fish populations in Lake Oahe. Catches of a 10.7-m semiballoon trawl, selected to monitor changes in the fish populations from 1965 to 1970, showed a downward trend in the abundance of all species, except walleye; the decline was largest in the lower area of the reservoir with a slight increase in the upper area. Of two trawl designs tested, semiballoon trawls captured more fish per hour than high-rise trawls, and a 15.9-m semiballoon trawl with a 3.8-cm mesh cod end captured fish at the highest and most consistent rate. The size and species composition of fish caught in small-mesh trawls differed from those caught in trap nets. Trawl catches were too small to recommend or warrant their use as a commercial fishing gear, but the use of both small mesh trawls and trap nets should improve accuracy in monitoring fish populations in this reservoir.
| Publication type | Report |
|---|---|
| Publication Subtype | Federal Government Series |
| Title | Evaluation of trawls for monitoring and harvesting fish populations in Lake Oahe, South Dakota |
| Series title | Technical Paper |
| Series number | 76 |
| Edition | - |
| Year Published | 1974 |
| Language | ENGLISH |
| Publisher | U.S. Fish and Wildlife Service |
| Contributing office(s) | Great Lakes Science Center |
| Description | 15 p. |
| First page | 0 |
| Last page | 15 |
| Google Analytic Metrics | Metrics page |