Brennan et al 2003 nearshore salmon central puget sound

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File Link: Brennan et al 2003 nearshore salmon central puget sound.pdf

Brennan, J.S., K.F. Higgins, J.R. Cordell, and V.A. Stamatiou. 2004. Juvenile salmon composition, timing, distribution, and diet, in marine nearshore waters of central Puget Sound in 2001-2002. King County Department of Natural Resources and Parks, Seattle, WA. 164 pp.

Notes

• Wild and hatchery fish likely compete for the same resources.
• 22 hatcheries among 13 watersheds were present in catch, and the presence of north sound fish indicates that early marine migration is not oriented towards the ocean.
• Chinook salmon were present over the entire sampling period (May-October in 2001 and April to December 2002). They were most abundant in June. Chinook were the most broadly distributed and there was no significant difference in abundance between island sites with no natal rivers and mainland sites with natal rivers, suggesting dispersal over open water.
• Pink Salmon were most abundant in April and absent by May.
• Chum Salmon were most abundant in April and May, and dropped off dramatically by June.
• Chinook diet shifted with increasing size, with benthic and epibenthic prey dominant at less than 9cm FL, planktonic and neritic components dominant for fish greater than 15 cm FL. Terrestrial insects were equally important within the intermediate size class.
• By contrast Coho diet was dominated by planktonic prey.