Our new Biological Assessment is out - Klamath Basin Crisis

Klamath Project Operations Biological Assessment
Coho Salmon: Effects of the Proposed Action on Coho Salmon
Because flow and temperature change over time, the model tracked a “cohort” of
fish that migrated together in the same time step. The term “cohort” refers to
specific groups of fish that spawn, rear, or emigrate together on a weekly or biweekly
time-step. For example, adult coho salmon that spawn between October 1
and October 6 were considered one cohort and those that spawn between October
7 and October 13 as another cohort. This convention helped to predict the effects
of temperature and flow on temporally explicit groupings of fish. The time period
for each cohort and the proportion of the population within that cohort were
defined by either spawn timing distributions or emigration timing distributions.
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