What are the primary mortality factors in the ocean? What is the main mortality factor affecting their return?
Chinook salmon spend the majority of their life in the ocean, and the right marine conditions are needed for their survival. Food supply at the right time and place is a major factor influencing salmon’s survival. The Chinook salmon’s diet changes as the fish grows, from tiny crustaceans like copepods to small fishes such as anchovies and sardines. This food supply is reliant on ocean upwelling and surface temperatures.
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