Marine Nutrients Important to Steelhead in Scott Creek Lagoon

Preliminary results of a study by Alison Collins and Morgan Bond (Fisheries Ecology Division, Salmon Ecology Team) on the nitrogen and carbon stable isotopic composition of juvenile steelhead muscle found strong evidence of the importance of marine derived nutrients to fish rearing in the sandbar-built freshwater lagoon on Scott Creek. In combination with Morgan’s findings that >80% of returning adults reared in the lagoon, as contrast to those rearing in upstream habitats, these results suggest marine nutrients are critical to the production of steelhead in these ecosystems. (May 28, 2007)