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.
yes
Yes they can
Blotches on the dorsal fin and tail fin(s) can be the diseases fin and tail rot, easily cured with medication.
A goldfish has about 1,500 bones inside of it.
The fin on the back of an orca is called the dorsal fin.
The dorsal fin is the fin on the back of a fish, for example the typical triangular fin on the back of a shark is its dorsal fin.
Well Lionhead goldfish are unique in that they have a raspberry-like growth surrounding their head called a 'wen", and they also have no dorsal fin.
Goldfish have 1 dorsal fin, 1 caudal fin, 1 anal fin, 2 pectoral fins and 2 ventral (pelvic) fins. They do not have a spiny Dorsal or an adipose fin so that makes them a 7 finned species. Breeders have devloped goldfish with different types of split Caudal (tail) fin but they are still single fins. These "sports" are commonly called Veiltailed, or Fantailed fish. (There are many other names of "goldfish sports" too). To the best of my knowledge they do not however have 8 fins. They have seven fins but the tail has been modified by selective breeding to look like more than one fin. (Breeders have also developed a type that has no dorsal fin which makes it a 6 finned fish).
the female orca's dorsal fin is curved and the males dorsal fin is straight
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.
No, a dorsal fin from a fish is on its back area.
The fin on the top/back of all fish is called the "Dorsal Fin."
Some sharks have a second dorsal fin, it's between the main dorsal fin in the middle of the back, and the tail. Not all fish have a second dorsal fin.