Marine animals that have body fluids with a solute concentration equal to that of the surrounding seawater are

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Marine animals that have body fluids with a solute concentration equal to that of the surrounding seawater are osmoconformers. These animals do not actively regulate their body fluids and therefore maintain an isotonic state with the surrounding seawater. Osmoregulators, on the other hand, actively regulate their body fluids to maintain a different solute concentration than that of the surrounding environment. "Hypotonic" and "hypertonic" refer to solutions with a lower and higher solute concentration, respectively, than the surrounding environment, and are not applicable to this question.

Marine Animals That Have Body Fluids with a Solute Concentration