Why don't fish get hernias?

Fish generally don't get hernias like mammals do because their bodies are structured differently. They have a swim bladder that helps maintain buoyancy, and their muscles and connective tissues are adapted to their aquatic environment, providing support without the same risks of protrusion that can lead to hernias. Additionally, the pressures of water help keep their organs in place, reducing the likelihood of abdominal wall weaknesses that can cause hernias in terrestrial animals.