In order to evaluate the biological response of salmonid juveniles to in-stream channel rehabilitation efforts, a long-term trend analysis of juvenile Chinook density over the 40 mile reach is planned. A pilot study was conducted in March and April 2009 to allow for comparisons with earlier studies and to snorkel at the peak time when juvenile Chinook were found previously in the river. A significant downward trend in juvenile salmon density from 1986 to 2009 was apparent.
Suggested further reading:
Hemphill, N and Chase, R (2010) Salmonid juvenile density in the upper Trinity River, 2009 GRTS pilot study. Oral presentation provided at the 2010 Trinity River Science Symposium