Why can some Pacific salt water fish live in fresh water?

tkept asked:


Why can Coho and King Salmon live in fresh water inland lakes ( Great lakes for example ) when they are a Pacific salt water fish. I understand Atlantic Salmon can not. Also why can Dunginess crab only live in the Pacific or Maine Lobsters can only live in the atlantic ? The temperatures are the same for the most part. Is there a big difference in the salinity of the water?

ALBERT

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