Krome those steelhead you caught that had the short dorsal fins nip at each other when they are young in a hatchery. We're growing steelhead up at Peninsula College and just about everyone has a short dorsal fin. I think the hatchery ones with a normal sized dorsal fin is an aggresive one that wasn't getting picked on by anyone else. I haven't caught any weird fish, but I've had dolly varden spit up their meal of salmon fry.

~ Dr Pepper