What are specialized fish lungs that absorb oxygen and release carbon dioxide called?

Specialized fish lungs that absorb oxygen and release carbon dioxide are called gills. Gills are vital respiratory organs found in many aquatic animals, including fish. They are designed to extract oxygen from water as it passes over them, allowing the fish to breathe underwater. The structure of gills allows for efficient gas exchange, where oxygen is absorbed into the bloodstream and carbon dioxide is expelled into the water.

The other options refer to different anatomical features. Lungs are respiratory organs typical of air-breathing animals and are not found in fish. Lateral lines are sensory organs that help fish detect movement and vibrations in the water, and swim bladders are gas-filled sacs that help fish maintain buoyancy, but they do not function in gas exchange like gills do.