| Abstract: | The gizzard shad (Dorosoma cepedianum) was introduced into 1,955-ha Angostura Reservoir, South Dakota to provide increased prey resources for walleye (Sander vitreus). Linear correlation analysis indicated that following gizzard shad introduction, walleye catch-per-unit-effort and mean length at age have increased over time (r = 0.68 to 0.85, P = 0.02 to 0.001). Walleye stomach contents were collected monthly from April through September, 2004 to determine the extent to which age-0 gizzard shad were being utilized as prey during the growing season. Age-0 gizzard shad were absent from walleye diets from April to mid-July (pre-shad-available period); however, from mid-July through early September (shad-available period), age-0 gizzard shad were an important prey item in all walleye diets. Mean weight decreased for walleyes of ages 2-5 during the spring, before age-0 gizzard shad became available; however, growth rate of walleyes increased appreciably during the shad-available period and was attributable to consumption of age-0 shad prey. In Angostura Reservoir, which lies at the northwestern edge of the gizzard shad range, walleye population characteristics have improved following shad introduction and during 2004, age-0 shad directly affected walleye feeding and growth. |
| Genre: | Article |
| ProdID: | 70029748 |
| Citation Author: | Ward, M. J.; Willis, D. W.; Miller, B. H.; Chipps, S. R. |
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| Citation End Page: | 345 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Freshwater Ecology |
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| Citation Number Of Pages: | 7 |
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| Citation Search Results Text: | Walleye consumption and long-term population trends following gizzard shad introduction into a Western South Dakota reservoir; 2007; Article; Journal; Journal of Freshwater Ecology; Ward, M. J.; Willis, D. W.; Miller, B. H.; Chipps, S. R. |
| Citation Start Page: | 339 |
| Citation Volume: | 22 |
| Citation Year: | 2007 |
| Type: | citation/reference |
| Text: | Walleye consumption and long-term population trends following gizzard shad introduction into a Western South Dakota reservoir; 2007; Article; Journal; Journal of Freshwater Ecology; Ward, M. J.; Willis, D. W.; Miller, B. H.; Chipps, S. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 2007 00:00 -0600 |
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