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Title: Idaho Supplementation Studies : Five Year Report : 1992-1996.

In 1991, the Idaho Supplementation Studies (ISS) project was implemented to address critical uncertainties associated with hatchery supplementation of chinook salmon Oncorhynchus tshawytscha populations in Idaho. The project was designed to address questions identified in the Supplementation Technical Work Group (STWG) Five-Year-Workplan (STWG 1988). Two goals of the project were identified: (1) assess the use of hatchery chinook salmon to increase natural populations in the Salmon and Clearwater river drainages, and (2) evaluate the genetic and ecological impacts of hatchery chinook salmon on naturally reproducing chinook salmon populations. Four objectives to achieve these goals were developed: (1) monitor and evaluate the effects of supplementation on presmolt and smolt numbers and spawning escapements of naturally produced fish; (2) monitor and evaluate changes in natural productivity and genetic composition of target and adjacent populations following supplementation; (3) determine which supplementation strategies (broodstock and release stage) provide the quickest and highest response in natural production without adverse effects on productivity; and (4) develop supplementation recommendations. This document reports on the first five years of the long-term portion of the ISS project. Small-scale studies addressing specific hypotheses of the mechanisms of supplementation effects (e.g., competition, dispersal, and behavior) have been completed. Baseline genetic datamore » have also been collected. Because supplementation broodstock development was to occur during the first five years, little evaluation of supplementation is currently possible. Most supplementation adults did not start to return to study streams until 1997. The objectives of this report are to: (1) present baseline data on production and productivity indicators such as adult escapement, redd counts, parr densities, juvenile emigrant estimates, and juvenile survival to Lower Granite Dam (lower Snake River); (2) recommend changes in methodologies and tasks to improve data collection efficiency and utility.« less
Authors:
Publication Date:
OSTI Identifier:
799290
Report Number(s):
DOE/BP-00006630-1
TRN: US200220%%928
DOE Contract Number:
89BP01466
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Aug 1999
Research Org:
Idaho Department of Fish and Game (IDFG)
Sponsoring Org:
US Bonneville Power Administration
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; ADULTS; EFFICIENCY; EVALUATION; GENETICS; GRANITES; IDAHO; JUVENILES; MONITORS; PRODUCTION; PRODUCTIVITY; RIVERS; SALMON CHINOOK SALMON - IDAHO; FISH POPULATIONS - IDAHO - MEASUREMENT.