Dorsal fin
The fin on the top/back of all fish is called the "Dorsal Fin."
I call it a sketch of a fish's fin. I am sorry if this does not help, but unless there is a fancy name for it I'm pretty sure its a sketch of a fish's fin. Answer: I call it a sketch of a fish's fin too but on my math hw thing it says u call it a scale drawing. how dumb is that?
It's top fin.
The tail fin acts as a rudder on a ship would.Turning the fish in whichever direction it wants to go in.
it is the fin on the top near the back of the fish
A "dul-fin" a.k.a "dolphin" (:
it helps it cut through the water
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.
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.
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.
That is almost all fish, but maybe you are thinking of a sun fish (mola mola) in particular.