Fork length – weight relationships are not significant between steelhead sampled from out-migrant traps, while those sampled throughout the watersheds by means of electrofishing were different between creeks. Older, larger fish tend to migrate downstream earlier in the trapping season. There is evidence that age 1+ and 2+ fish make up the majority of downstream migrants. During the 2005 out-migrant trapping season, the data revealed that non-smolting fish are moving downstream in the watershed in addition to smolting fish. There were very few observations of steelhead moving downstream on both survey creeks in 1993. irideus in San Simeon and Santa Rosa Creeks during the years of 19. The results of these surveys showed that habitat types have changed on San Simeon Creek between survey years while Santa Rosa Creek appeared to remain the same.īiological inventory methods were conducted on the populations of O. The data generated from the habitat mapping surveys was compared between the two creeks over the two different survey years (19).

Habitat mapping surveys were conducted on each stream in order to identify suitable habitat for various steelhead life stages. The main goal of this thesis is to analyze demographic and habitat data from the steelhead populations of two northern San Luis Obispo county coastal streams, San Simeon and Santa Rosa Creeks. This thesis takes a closer look at a biological and environmental data collected by the California Department of Fish and Game Central Coast Steelhead and Coho Salmon project under the direction of Associate Biologist Jennifer Nelson.

Specifically, demographic information including length, age, and condition when first leaving a watershed for the open ocean is lacking. Currently, little is known about the demographics of the Oncorhynchus mykiss irideus, or steelhead trout, populations in San Luis Obispo County.

Circuli vs annuli