Regarding your question, crocodiles can live in sea water. What you are asking may mean that you are thinking of the deep sea or the sea far from land. Pure salt seawater is not mixed seawater.
First of all, there are no crocodiles in the deep sea, because there are no crocodiles in the deep sea. There is very little oxygen and the crocodile's respiration is that of reptiles, which relies mainly on the lungs, and a small amount of oxygen is exchanged through the skin. If the crocodile lives in the deep sea or in the sea like a fish, it will do this. soon suffocate to death. Or, it can only live near the shore or in places with access to air. He must be able to breathe air normally to survive.
Based on currently known data, no crocodile lives only in sea water. Most of them resemble those thatyou described, living only in places where salt and fresh water mix, or in bays, in general. Known as Gulf crocodiles, however, saltwater crocodiles are generally more ferocious than freshwater crocodiles. For example, Yangtze River alligators are smaller and have a gentle personality.
But freshwater crocodiles are average. cruel personality and sometimes cannibalizes people.