Abundance and Microhabitat Selection of Juvenile Oncorhynchus mykiss and Juvenile Chinook Salmon (O. tshawytscha) Within Shitike Creek, Oregon at Varying Fish Densities and Presence or Absence of Bull Trout (Salvelinus confluentus). Progress Report Fiscal Year 2005 and 2006 Work Plan

摘要

In 2002, the Service and the Confederated Tribes of the Warm Springs Reservation of Oregon (CTWSRO) received funding to evaluate the outplanting program in Shitike Creek and provide information on ecological interactions between spring Chinook and other fish species (FONS Project Number 1999-010). One aspect of the evaluation is to determine habitat use and ecological interactions between juvenile spring Chinook salmon (Oncorhynchus tshawytscha), juvenile summer steelhead or rainbow trout (O. mykiss), and bull trout (Salvelinus confluentus) in Shitike Creek. In 2003, the Service and the CTWSRO implemented a summer snorkel survey to specifically evaluate microhabitat selection of juvenile salmonids and investigate ecological interactions from the Chinook salmon outplanting program. The results of the evaluation will be used by Service personnel and managers of natural resources to mitigate and reduce ecological interactions between hatchery and wild fish. The following project objectives were proposed for fiscal year 2003-2005.