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The pelagic zone can be thought of in terms of an imaginary cylinder or water column that goes from the surface of the sea almost to the bottom. Conditions differ deeper in the water column; the pressure increases, the temperature drops and less light penetrates.he pelagic zone can be contrasted with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the very bottom of the sea.
Pelagic fish inhabit the water column (not near the bottom or the shore) of coasts, open oceans, and lakes. Oceanic pelagic fish, such as the tuna pictured above, have agile bodies made for long distance migration.Many oceanic pelagic fish travel in schools while some are solitary that drift with ocean currents.elagic fish inhabit the water column (not near the bottom or the shore) of coasts, open oceans, and lakes. Oceanic pelagic fish, such as the tuna pictured above, have agile bodies made for long distance migration.