Electrofishing injury and short-term mortality in hatchery-reared rainbow trout stocked into an Ozark stream
North American Journal of Fisheries Management
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Abstract
We conducted an electrofishing injury study to evaluate potential effects of sampling procedures on survival and health of hatchery rainbow trout Oncorhynchus mykiss (187-307 mm total length) stocked into an Ozark stream. We assessed two groups of trout: one group had acclimated to stream conditions for 1 month; the other group was handled and transported just before the study. Each group was sampled by electro-fishing (boat-mounted, 60-Hz AC) and seining (controls), resulting in four treatment groups (N = 21). We held fish for 48 h to evaluate mortalities in that period, then euthanized all fish and examined them for hemorrhages and spinal damage. No fish died during the 48-h holding period, indicating that our procedures did not cause significant sampling-related mortality among stocked trout in Brush Creek. Spinal damage was observed in 5% of fish collected with electrofishing but in none of the control fish. We found hemorrhages in 90% of electrofished trout but none in control fish, and recently handled and hauled trout had a greater occurrence and severity of hemorrhaging.
Suggested Citation
Walsh, M.G., Winkelman, D., and Bahr, R., 2004, Electrofishing injury and short-term mortality in hatchery-reared rainbow trout stocked into an Ozark stream: North American Journal of Fisheries Management, v. 24, no. 1, p. 316-321, https://doi.org/10.1577/M03-002.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Electrofishing injury and short-term mortality in hatchery-reared rainbow trout stocked into an Ozark stream |
| Series title | North American Journal of Fisheries Management |
| DOI | 10.1577/M03-002 |
| Volume | 24 |
| Issue | 1 |
| Publication Date | February 01, 2004 |
| Year Published | 2004 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | North American Journal of Fisheries Management |
| First page | 316 |
| Last page | 321 |