Why do fish bleed when caught?

Fish bleed when caught because they have a network of blood vessels just below their skin. When a fish is caught, these blood vessels are often damaged, causing blood to leak out. The amount of bleeding can vary depending on the species of fish and how it was caught. Some fish, such as tuna and swordfish, have a higher blood volume than others and may bleed more heavily. Fish that are caught with nets or traps may have more bleeding than those that are caught on hooks or lures.

In addition to the blood vessels, fish also have a number of other organs that can bleed when damaged. These include the gills, the heart, and the liver. If a fish is injured in these areas, it may bleed to death.

Bleeding can be a serious problem for fish, as it can lead to infection and death. To reduce the risk of bleeding, fishermen should handle fish carefully and avoid injuring them. They should also use sharp hooks and lures to minimize the damage to the fish's skin.