Salmon change colors to attract a spawning mate. Some pacific salmon use a lot of their energy for returning home! For making eggs and digging a nest, most of them stop eating when they return to freshwater and have no energy left for a returning trip after spawning.
When they return for spawning, they stop feeding. They have a shape change, especially the males. In some species, they form a hump on their back and their mouths change. The males and females both have color changes.
When they return for spawning, they stop feeding. They have a shape change, especially the males. In some species, they form a hump on their back and their mouths change. The males and females both have color changes.
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