OK, do the fingerling catfish have forked tails < or blocked tails ] ? That will tell you what type of spawn you have. If they are channel cats with a forked tail, a heavy predator base will usually control their numbers, along with canabalism. If they are Mudcats with a blocked tail, you are in for a fight. One of our ponds experienced mudcats several years ago, we introduced "yellow cats" i.e. flathead catfish (eating machines), and caught them out with trot lines when they finished the job...it took 2 years to clear the mudcats out...but, they do not exist anymore.