Fishing is like hunting but fishes don't scream in pain because they are different from land vertebrates. They feel pain though, people who go fishing as a hobby normally kill the fish by quickly by smashing them on a rock just after they have caught it. Still anglers' tackle left behind harms other animals like Birds and turtles. Commercial fish are left to slowly suffocate.
Catch-and-release fishing is cruelty disguised as “sport.” Studies show that fish who are caught and then returned to the water suffer such severe physiological stress that they often die of shock. (...) When fish are handled, the protective coating on their bodies is disturbed. These and other injuries make fish easy targets for predators once they are returned to the water. Fish feel pain because, like all animals, they have nerves. Hooked fish struggle out of fear and physical pain, desperate to breathe. Once fish are hauled out of their aqueous environment and into ours, they begin to suffocate, and their gills often collapse. In commercial fishing, fish’s swim bladders can rupture because of the sudden change in pressure.