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Some Species of Fish in the Salmon Family (Called Salmonids)

Question 114

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Some species of fish in the salmon family (called salmonids) are anadromous, meaning that they mature in salt water but migrate to bodies of fresh water to breed. These species are usually semelparous. Other nonanadromous species in this family live their entire lives in bodies of fresh water and are generally iteroparous. What might be the explanation for the difference in the life history patterns of these two groups of salmonids?

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Semelparity is typical of organisms that...

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