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.
The tail fin of a fish (the caudal fin) is a fish's means of propulsion through the water.
The fin on the top/back of all fish is called the "Dorsal Fin."
No, a dorsal fin from a fish is on its back area.
Most fish typically have 7 fins in total. - The dorsal fin. Prevents fish from rolling. - Adipose Fin. Makes the fish hydrodynamic. - Caudal Fin (tail). Propels the fish through the water. - Pectoral fin (x2). helps the fish steer and halt. - Pelvic fin. Helps the fish steer and halt. - Anal fin. Keeps the fish from rolling.
Most species of fish don't have an adipose fin.
There are literally hundreds of species of fish that have a red fin.
what do the dorsal and anal fins do for a fish
I'd suggest that you read the book of Genesis. It will tell you how everything was created. The same way apes evolved into humans, through mutation. Also, the same way new viruses and other forms of life are coming into existence today. I found a program on Discovery explaining the difference between ray-fin fish and lobe-fin fish to be very educational. Lobe-fin fish are our earliest ancestors with the same basic skeleton as humans having distinct finger bones and limbs. Ray-fin fish have the same limb that current fish have such as catfish or goldfish. They remained on that evolutionary tree where we humans branched from lobe-fin fish.
2 fins
Dorsal fin
its called the dorso fin