Marine fishes have special organs known as gills that help in respiration. Gills also help to maintain osmotic pressure in marine fishes. The gills contain epithelial cells that help in exchange of ions from the environment.

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Chapter 49, Problem 3TY

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Introduction: Marine fishes have special organs known as gills that help in respiration. Gills also help to maintain osmotic pressure in marine fishes. The gills contain epithelial cells that help in exchange of ions from the environment.

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