It was just the pair of fins on the belly that I couldn’t name of when I drew this goldfish at the dentist’s last month. They’re the pelvic or ventral fins. It’s probably the fact that there are two names that I find it difficult to remember.
Members of the salmon family have an extra fin; the adipose, a small upward pointing fin between the dorsal and caudal.
This drawing is an amalgam of several fish that were in constant motion in the tank in the waiting room. They varied widely in fin length and colour patterns so I tried to keep coming back to the individuals that were closest to the standard goldfish.