The channel catfish.
yes
The fin shape is usaly heart shape,but black.
probably when they grow
Depending on the damage, a fin can grow back provided the fish is cared for properly and the water is clean
no , but you can get hit by the dorsal fin. you cold get food poisening from under cooked or raw catfish meat
Kers or Barbels
Provided the reason for the loss of fins is removed and the conditions the fish is living in are correct then yes the fins will usually grow back. They will however never be as good (well shaped) as the originals.
Chinese catfish can grow to a length of 4 to 5 centimeters.
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
The fin on the back of an orca is called the dorsal fin.