Yes as they are constantly in the sea and the ocean so as the ocean water is saline they have the marine water and seas and oceans are marine bodies
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Yeah partially as in the ocean saline water is there so osmotic potential of the water is less than that of marine livestock so the water enters and when there is an equilibrium there is no water enter into the body.. so we can say the marine bodies take more water than a fresh water fish but not drink.. because water is only helpful to them for only respiration.
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