the little fin helps the fish to push its self foward the common house fish can not swim like a shark (swaying back and forth with no little fin) it pretty much means that without the little fin the fish will not be able to swim so the whole thing is the fins on a fish do not work alone they work as a team.
Use a medicine called Mr. Yellow found in medical stores and pet shops. This cures fin rot.
Every fin a fish has is there for a purpose. Of course the pectoral fins help them swim. They can also be used as brakes.
It is very badly damaged and will probably die. -----improved answer ---- that's actually incorrect, unless there are signs that there was a fin to begin with, in which case it is probably fin rot... but if you are talking about those goldfish that swim super awkward and have no fins on their back, then you are talking about a celestial goldfish. some bubble eyed goldfish also come with no fins.
What else would you expect them to swim in? Of course Goldfish swim in water.
it would be could or have fin rot
I would name my black goldfish Fin
it my not your
yes
Yes, but normally they grow back slowly. However, if fin rot has reached the base of the fin, then the goldfish would be in pain the rest of its life.
no a shark can not swim without it's top fin
No
yes, but it may kill the goldfish