[env-trinity] Mainstem Trinity River Spawn Survey Update for September 16, 2016

Rupert, Derek derek_rupert at fws.gov
Mon Sep 19 17:10:05 PDT 2016

Hello All,

The US Fish and Wildlife Service along with the Yurok Tribe, California
Department of Fish and Wildlife, US Forest Service, and Hoopa Valley Tribe
have another weekly update for our Trinity River mainstem spawn survey.
The full update is posted on the Arcata Fish and Wildlife Fisheries

Trinity River spawn Survey update September 16, 2016.

This week our crews mapped 12 redds (13 total for the year) in the Reaches
from Lewiston Dam  to Cedar Flat (excluding Pigeon Point). The graph below
is clipped from our weekly report (limited to the river upstream of Cedar

​During the mainstem Trinity River spawn surveys there are three
populations of salmon that are encountered: spring-run Chinook, fall-run
Chinook, and Coho salmon.  We generally see spring-run Chinook Salmon begin
spawning the earliest, around mid-September.  This is followed by peak fall-run
Chinook Salmon spawning  in mid-October.  Coho salmon begin spawning late
in the year, around late-November.  Our surveys only partially cover the
Coho Salmon spawning season, which continues beyond our last surveys in


Derek Rupert
Fish Biologist
US Fish and Wildlife Service
Weaverville, CA
Office 530.623.1805
Cell 570.419.2823
Derek_Rupert at fws.gov
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