The tail fin of a fish (the caudal fin) is a fish's means of propulsion through the water.
On a dolphin and most fish the fin behind the dorsal fin is the tail fin. Some fish, such as knife fish, have no dorsal fin or tail fin. Dolphins of course are mammals, not fish.
It depends on what type of fish it is and if it has any blood vessels in its tail fin.
The tail fin acts as a rudder on a ship would.Turning the fish in whichever direction it wants to go in.
Force created by the tail and tail fin to propel the fish forward and steer the fish;
A fish's tail is called a caudal fin.
Yes, it is called a fin.
Those are the flippers, or 'pectoral' fins.
thresher fish
If there are long stringy pieces of fin left, it's tail biting caused by stress or boredom. Anything else, it's fin rot caused by filthy water. Way to go.
Dorsal fin, gills, tail.
It depends on the species.