sorry about that kiwi just noticed the question , most of the rainbows in this country are stocked not wild, they are grown in lagre quantities together not allowing the tails and fins to fully form , so alot of the stocked stiff is like that ,if you do get a fish which has been in a while the fins fully form and are a much better fight like a paddlke steamer, so fishereies do stock decent fish with good fins but not all hope this helps you out cheers rob