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The fin on the top/back of all fish is called the "Dorsal Fin."
Dorsal fin
It's top fin.
it is the fin on the top near the back of the fish
A fish has several different types of fins. There are the pectoral fins, located beneath the operculum (gills). There is the pelvic fin, located at the bottom of the fish, below the pectoral fin. There is the anal fin, which i located behind the anus, and there is the dorsal fin as well. It is located on top of the fish.
it helps it cut through the water
I think that the largest fin of a perch is the first dorsal fin, the one that is located on the top of the fish and is spiny.
The "DORSAL" fin is the fin fish have on the top of their back. It is often shaped a bit like a triangle or sail.
That is almost all fish, but maybe you are thinking of a sun fish (mola mola) in particular.
The Snakehead fish is a freshwater predatory fish. it is native to Africa and Asia. They can be distinguished from other fish by being very long with a long fin on the top and slightly shorter fin on the bottom.
9 inches tall
the swordfish has a longer snout and the sailfish's top fin is colorful to the point where it looks like a boats sail