Protection of Wild Adult Steelhead in Idaho by Adipose Fin Removal: 1984-1985 Annual Report.
All Idaho hatchery-reared steelhead released in the spring of 1985 received an adipose fin clip to differentiate between natural or wild and hatchery, fish, thus allowing for protection of wild fish in the sport harvest. Between 25 September and 14 December 1984, 6,360,542 steelhead trout (Salmo gairdneri) were marked by excising the adipose fin. A total of 10,336 man hours were required to complete the operation. Clip quality and healing, mortality, and adipose fin composition were determined. Quality checks indicated less than 1% of the fish had more than 25% of the fin remaining. Combined mortality at all three hatcheries was 0.3% of the total fish marked. Observed and in vivo test showed complete healing of the excision within 3-4 weeks (observed) and 22 days (in vivo). Bibliographies were compiled for fin regeneration, marked fish survival, hooking mortality, and related catch-and-release studies.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
- DOE Contract Number:
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Research Org:
- Idaho Department of Fish and Game (IDFG)
- Sponsoring Org:
- United States. Bonneville Power Administration.
- Country of Publication:
- United States
- 54 ENVIRONMENTAL SCIENCES; FISHERIES; MANAGEMENT; FISHES; POPULATION DYNAMICS; IDAHO; MORTALITY; SURVIVAL CURVES; ANIMALS; AQUATIC ORGANISMS; FEDERAL REGION X; NORTH AMERICA; USA; VERTEBRATES Steelhead (Fish) - Idaho 520500* -- Environment, Aquatic-- Site Resource & Use Studies-- (-1989)
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