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Description: |
15 pages : illustrations, tables ; 26 cm. |
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General Note: |
Part of "Twelve Papers on Lake Oahe, North and South Dakota." |
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With Note: |
Bound with: Ecological changes during the transitional years of final filling and full impoundment (1966-70) of Lake Oahe, an Upper Missouri River storage reservoir (Technical Paper 71) ; Physical and chemical characteristics of Lake Oahe, 1968-69 (Technical Paper 72) ; Invertebrate macrobenthos of Lake Oahe, 1968-69 (Technical Paper 73) ; Limnetic crustacean zooplankton of Lake Oahe, May-October 1969 (Technical Paper 74) ; Species and age composition of trap net catches in Lake Oahe, South Dakota, 1963-67 (Technical Paper 75) ; Age, Growth, and maturity of thirteen species of fish from Lake Oahe during the early years of impoundment, 1963-68 (Technical Paper 77) ; Population trends, growth, and movement of bigmouth buffalo, Ictiobus cyrinellus, in Lake Oahe, 1963-70 (Technical Paper 78) ; Goldeye, Hiodon alosoides, in Lake Oahe: Abundance, age growth, maturity, food and the fishery, 1963-69 (Technical Paper 79) ; The commercial fishery in Lake Oahe, North and South Dakota, 1964-70 (Technical Paper 80) ; Age, growth, sexual maturity, and food of channel catfish in Central Lake Oahe, 1968-69 (Technical Paper 81) ; An experimental trap net fishery, Lake Oahe, South Dakota, 1965 (Technical Paper 82). |
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Bibliography Note: |
Includes bibliographical references (page 15). |
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Summary, Etc. Note: |
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 20.7-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 the fish caught in small-mesh trawls differed from thos caught in trap nets. Trawl cataches were too small to recommend or warrant their use as a commercial fishing gear, but the use of both small mess trawls and trap nets should improve accuracy in monitoring fish populations in this reservoir. |
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Action Note: |
will digitize $c 20140129 $z Queued for digitization January 29, 2014 $2 pda $5 miu |
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Additional Physical Forms: |
Online version: Nelson, William Roland, 1936- Evaluation of trawls for monitoring and harvesting fish populations in Lake Oahe, South Dakota. Washington, D.C. : U.S. Dept. of the Interior, Fish and Wildlife Service, 1974 (OCoLC)903582185 |