Assessments to determine the effect of current and alternate ladder operations on brood stock collection and behavior of hatchery fall Chinook Salmon at Little White Salmon National Fish Hatchery during 2004-05
Published By US Fish and Wildlife Service, Department of the Interior
Issued over 9 years ago
Summary
Description
Production of upriver bright fall Chinook salmon at Little White Salmon National Fish Hatchery was introduced as part of the John Day Dam mitigation program in the early 1980s. Upriver bright fall Chinook salmon are not native to the Little White Salmon River basin and are an introduced stock for the Lower Columbia River Chinook Evolutionary Significant Unit, as listed under the Endangered Species Act. There is concern regarding potential ecological effects, especially hatchery introgression effects, if wide spread straying of this stock occurs in the Columbia River USFWS 2004. Objectives of this study were to determine if hatchery brood stock collection is representative of the hatchery return; determine if intermittent ladder openings increase natural spawning and straying of Little White Salmon National Fish Hatchery returning adults; and determine the final destination of fish not allowed access to the hatchery or selected for brood stock.