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Kelt Reconditioning: A Research Project to Enhance Iteroparity in Columbia Basin Steelhead (Oncorhynchus mykiss) – 2004 Annual Report

Nov 1, 2004

Abstract

Iteroparity, the ability to repeat spawn, is a life history strategy that is expressed by some species from the family Salmonidae. Rates of repeat spawning for post-development Columbia River steelhead Oncorhynchus mykiss populations range from 1.6 to 17%. It is expected that currently observed iteroparity rates for wild steelhead in the Basin are severely depressed due to development and operation of the hydropower system and various additional anthropogenic factors. Increasing the expression of historical repeat spawning rates using fish culturing methods could be a viable technique to assist the recovery of depressed steelhead populations, and could help reestablish this naturally occurring life history trait. Reconditioning is the process of culturing post-spawned fish (kelts) in a captive environment until they are able to reinitiate feeding, growth, and redevelop mature gonads.

Authors

Douglas Hatch, Ryan Branstetter, John Whiteaker, Joe Blodgett, Bill Bosch, David Fast, and Todd Newsome

Citation

Hatch, D., R. Branstetter, J. Whiteaker, J. Blodgett, B. Bosch, D. Fast, and T. Newsome. 2004. Kelt Reconditioning: A Research Project to Enhance Iteroparity in Columbia Basin Steelhead (Oncorhynchus mykiss) – 2004 Annual Report. Columbia River Inter-Tribal Fish Commission Technical Report 04-08, for Bonneville Power Administration Project 2000-017-00. 57p.

Date

2004/11/01

Report No.

04-08

Media Type

Inter-Agency Report