Reproductive Ecology of Yakima River Hatchery and Wild Spring Chinook and Juvenile-to-Adult PIT-tag Retention

摘要

This is the first of a series of annual and progress reports that address reproductive ecological research and comparisons of hatchery and wild origin spring chinook in the Yakima River basin. Data have been collected prior to supplementation to characterize the baseline reproductive ecology, demographics and phenotypic traits of the unsupplemented upper Yakima population, however this report focuses on data collected on hatchery and wild spring chinook returning in 2001; the first year of hatchery adult returns. This report is organized into three chapters, with a general introduction preceding the first chapter and summarizes data collected between January 1, 2000 and December 31, 2000 in the Yakima basin. Summaries of each of the chapters included in this report are described.