How do Marine animals adapt to hypertonic seawater?
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Answer :
The turtle, which evolved to close over its ribs and backbone with hard material, making them both into very hard continuous protective layers, even though underneath it all they have a skeleton similar to our own.
Electric eels, which evolved the ability to store their bodies innate electrical energy until such time as they needed to deliver it as a shock, either as a protection or as a method of stunning their prey. This one is a great example of an adaptive evolution that has more than one use, and a big poke in the eye to creationists who deny evolution, as they like to argue that evolution is supposed to be about things always having a specific purpose, which is unlikely, so God did it instead. Whereas in fact evolution is somewhat random, and many adaptations (mutations, really) are either useless or are later found to have a use
Marine animals generally are isosmotic in nature, which mean that they have same salt concentration in their body as that in their environment. But if the salinity or the concentration of salt in the sea water increases, the marine animals have their own mechanism of balancing the salt concentration.
The process of osmoregulation is done through the gills or the lungs of the fishes and other sea animals which regulate the concentration of salt in the internal as well as external environment.