The Chum and Coho Salmon have a very similar diet. They both feed on aquatic insects and plankton, however, the Chum Salmon specifically feeds on zooplankton rather than Chum Salmon that eats all and any plankton available.
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What do the Salmon Eat? - Learning Portal
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Pink salmon are thriving in warmer waters, affecting other species
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Scientists Reveal Salmon May Not Be the Healthiest Fish To Eat
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Salmon: A Foundational Species - Pacific Wild
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When Chinook salmon is off the menu, other prey will do for