| 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. |
| Genre: | Federal Government Series |
| ProdID: | 37607 |
| Citation Author: | Nelson, William R.; Boussu, Marvin S. |
| Citation Contributing Office: | Great Lakes Science Center |
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| Citation Edition: | - |
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| Citation End Page: | 15 |
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| Citation Language: | ENGLISH |
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| Citation Number Of Pages: | 15 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | 15 p. |
| Citation Projection: | |
| Citation Public Comments: | Out-of-print |
| Citation Publisher: | U.S. Fish and Wildlife Service |
| Citation Series: | Technical Paper |
| Citation Series Code: | TP |
| Citation Series Number: | 76 |
| Citation Search Results Text: | Evaluation of trawls for monitoring and harvesting fish populations in Lake Oahe, South Dakota; 1974; Federal Government Series; TP; 76; Nelson, William R.; Boussu, Marvin S. |
| Citation Start Page: | 0 |
| Citation Volume: | |
| Citation Year: | 1974 |
| Type: | citation/reference |
| Text: | Evaluation of trawls for monitoring and harvesting fish populations in Lake Oahe, South Dakota; 1974; Federal Government Series; TP; 76; Nelson, William R.; Boussu, Marvin S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://hdl.handle.net/2027/uc1.31822006841605?urlappend=%3Bseq=135 |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Fish and Wildlife Service |
