Salmon Snapshots

San Lorenzo River

2016/17 Population

Estimate of Ocean Returning Fish

Coho

Oncorhynchus kisutch

Steelhead

Oncorhynchus mykiss

What We Have  
unknown
unknown
What We Need  
3,800
3,200
Notes:

Population estimates (derived from redd counts) are provided by California Department of Fish and Wildlife. Due to persistent high flows from mid-Devember through the end of March, only a few surveys per reach were done throughout the spawning period. Sample size too small to make population estimates at watershed scale. Sample size was set for the Regional Scale. Abundance estimates per stream determined by extrapolation of data from Generalized Random Tesselation Sampling (GRTS) are rough estimates. The purpose of this sampling protocol was for larger scale (regional) abundance estimates as per Fish Bulletin 180 of the California Coastal Salmonid Monitoring Program. No Steelhead population surveys were conducted due to lack of funding. Data are preliminary and subject to change.

Coho salmon are federally listed as endangered. Chinook and steelhead are federally listed as threatened. The “What We Need” spawner population abundance targets shown above represent just one of several criteria that the National Marine Fisheries Service considers when determining whether a species should be removed from the Federal List of Endangered and Threatened Wildlife and Plants (50 CFR 223.102). Recovering any of the species entails meeting criteria for abundance, productivity, diversity, and spatial structure across multiple watersheds, as well as criteria for alleviating threats (NMFS 2012, NMFS 2016).

The 2016/17 snapshot is defined as fall 2016 to spring 2017, as per when salmon and steelhead return from the ocean to spawn. Fall Chinook spawning season is fall 2016. Coho season is fall through early January 2017. Steelhead season can start in fall 2016 but is primarily winter and spring 2017.

References

National Marine Fisheries Service. 2012. Final Recovery Plan for Central California Coast Coho Salmon Evolutionarily Significant Unit. National Marine Fisheries Service, Southwest Region, Santa Rosa, California.

National Marine Fisheries Service. 2016. Final Coastal Multispecies Recovery Plan. National Marine Fisheries Service, West Coast Region, Santa Rosa, California.

 

fish images © Joe Tomelleri

^