How do a physoclistous fish and a physostomous fish compare in terms of the amount of energy each must use to maintain its position (depth)in the water column over the long term?

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Physostomous fish have a specialized gas bladder that allows them to adjust their buoyancy by gulping air from the surface. This is a more efficient method of maintaining their position in the water column, as it requires less energy than the physoclistous fish, which has a rigid gas bladder that cannot adjust. Physoclistous fish must actively swim to maintain their depth, which requires more energy over the long term.

How Do a Physoclistous Fish and a Physostomous Fish Compare