Adult anadromous fish require habitat where the fish can reside prior to and during Spawning activities. Holding generally takes place in the deeper areas of a river such as pools or behind instream structures. This also provides the fish some level of protection from predators and poachers. Adult fish can hold in these pools from one to two weeks up to several months, depending upon the run.River basin was eliminated, resulting in large-scale reductions in physical habitats for all runs of salmon and all freshwater life stages. The dams also eliminate the recruitment of spawning gravel in downstream reaches.
- Water Temperature and Flows – The timing and quantity of releases from Shasta Dam in
particular have been tied to egg mortality. Changes in reservoir operations that further
alter the operation of the projects can impact the availability and temperature of water in a manner that is detrimental to incubating salmon eggs.
