What type of animal can be a saltwater and a freshwater animal?

What type of animal can be a saltwater and a freshwater animal?
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1 Answer

Answer :

All fish, whether they live in salt water or fresh water  must maintain a certain level of salinity in their bloodstream to survive. Most are restricted to one environment because they cannot change the way they regulate this, but some species spend periods of their life in both environments. Examples of such species are red fish drum, black drum, pin fish, croakers, lady fish, tarpon etc.
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