Salmon Snapshots

Mattole River

2016/17 Population

Estimate of Ocean Returning Fish

Coho

Oncorhynchus kisutch

Chinook

Oncorhynchus tshawytscha

Steelhead

Oncorhynchus mykiss

What We Have  
0 redds
929 redds
222 redds
What We Need In-River Return:   In-River Return:
  1,000
  4,000
  10,700
Notes:

Estimate of the number of spawning fish nests (called redds) follow the California Department of Fish and Wildlife’s California Coastal Salmonid Monitoring Program protocols, starting in 2012/13. Population estimates of the number of fish will be based on these redd estimates. The 95th % confidence interval is 0 redds to 0 redds for coho, 90 redds to 572 redds for fall chinook, and 192 redds to 585 redds for steelhead. The survey period is targeted to encompass the coho and Chinook spawning season, and typically begins when fall rains open the river mouth and ends at the end of February. Surveys do not encompass the entirety of the winter-run steelhead spawning season, which would require a much longer survey season (into the month of May), which is currently not possible given available funding and ESU-level priorities. Data are preliminary and subject to change. Data provided by the Mattole Salmon Group.

This value is the redd abundance estimate. Spawner redd ratio not yet been established. CCMP Fish Bulletin 180 GRTS protocol. The survey period is targeted to encompass the coho and Chinook spawning season, and typically begins when fall rains open the river mouth and ends at the end of February.

Coho, Chinook and steelhead in the Mattole River 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 2014, 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. 2014. Final Recovery Plan for the Southern Oregon Northern California Coast Evolutionarily Significant Unit of Coho Salmon (Oncorhynchus kisutch). September 2014.

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

 

fish images © Joe Tomelleri

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