Tag and evaluate PITtag retention in juvenile chinook
- Slides: 7
Tag and evaluate PIT-tag retention in juvenile chinook salmon Matthew R. Dare and C. Scott Mc. Cutcheon Biomark, Inc. , Boise, Idaho Dmitri Vidergar IDFG, Nampa, Idaho
NATURES Background • NATURES methods incorporated into hatchery practices in 1990 s. • Animals that most closely mimic “wild” morphology and behavior will lead to successful supplementation programs. • “Treatment-control” experiments using NATURES and standard hatchery methods. • Post-release survival evaluated using PIT tags during downstream migration and CWTs for adult returns.
Retention Research • Few studies • Small numbers • No temporal component
Relationships with Existing Projects • IDFG supplementation programs • Evaluate supplementation strategies • Identify most appropriate methods • RPA Action 174 and RPA Action 185 • Existing Supplementation Programs • IDFG: 8909800 • Nez Perce: 8909802 • Shoshone-Bannock: 8909803 9505700 • Basin-wide relevance
Objectives 1. PIT-tag 12, 000 juvenile chinook salmon • Preliminary collection efficiency study • Approximately 100 mm TL • 8 days of fieldwork 2. Monitor tag loss for 30 days • Daily raceway sweep (7 days) • Sweeps every 72 h (8 -30 days) • Data analysis and compilation
Anticipated Results • Estimates of shedding rates for 30 d post-tagging. • Comparison of shedding rates between NATURES and standard rearing methods. • Contribution to PITAGIS database and appropriate assessment of NATURES methods. • Manuscript for submission to peer-reviewed journal.
