Survival, growth and movement of juvenile coho salmon (Oncorhynchus kisutch) over-wintering in alcoves, backwaters, and main channel pools in Prairie Creek, California
Bell E. 2001. Survival, growth and movement of juvenile coho salmon (Oncorhynchus kisutch) over-wintering in alcoves, backwaters, and main channel pools in Prairie Creek, California
From the Abstract: "Individual juvenile coho salmon movements, growth, and outmigrant trap captures were monitored to assess and characterize the quality of over-wintering habitat in Prairie Creek, California. Over 2,000 juvenile coho salmon were PIT tagged in the fall of 1998 and 1999 in alcoves, backwaters, and main channel pools. Outmigrant traps and repeated sampling of individual habitat units were used to determine if habitat fidelity, growth, and survival of juvenile coho salmon rearing in alcoves, backwaters, and main channel pools differed among habitat types. Average fidelity of juvenile coho salmon in all habitat units was about 16% in winter 1998/99, and about 16% in winter 1999/2000, and ranged from 0 to 100% in individual habitat units. Minimum estimated survival of juvenile coho salmon that occupied sampled habitats averaged about 15% in 1998/99, and about 22% in 1999/2000. I found that in winter 1998/99, during which a 5-year flood occurred, juvenile coho salmon rearing in alcoves had significantly higher fidelity, and survival than fish originally occupying other habitats. The flood had no detectable effects on survival of juvenile coho salmon. No differences in fidelity or survival rates were detected among habitat types in winter 1999/2000. Percent change in weight of juvenile coho salmon from November to March averaged only 4% in 1998/99. In 1999/2000, which had warmer water temperatures than 1998/99, percent change in weight from November to March averaged 28%. Forty-two recaptures of juvenile coho salmon in winter 1999/2000 that were tagged in winter 1998/99 confirmed the occurrence of a two-year freshwater life history. Among smolts outmigrating in spring 2000, about 28% were estimated to be age 2+ smolts."
- Type
- Academic
- Authors
- Bell, Ethan
- Date of Issue
- 2001-09
- Units
- REDW
- Keywords
- Coho Salmon, Fish Studies, Growth, habitat fidelity, Movements, Oncorhynchus kisutch, PIT-tagging, Prairie Creek, Survival Rates, Thesis, Threatened Species