Swim bladders would be expected to be present in

Question

Quizplus · Accepted Answer

Swim bladders are used by fish as a gas-filled sac to help control buoyancy and enable them to maintain their depth in the water column. Therefore, it would be expected that most surface-dwelling fish would have swim bladders. Flounders are bottom-dwelling fish, and it is not clear whether they would have swim bladders or not. Fish living in the abyssal zone are typically deep-sea creatures that inhabit the ocean floor, so it is unlikely that they would have swim bladders. Tunas do have swim bladders, but the question asks for the "expected" presence of swim bladders, and not all fish that have swim bladders necessarily have them for the same reasons or to the same extent.

Swim Bladders Would Be Expected to Be Present in