"MIstatee" wrote in message
m...
I have a pond full of koi (12) and one black catfish. Will this black
catfish eat the Koi babies? Is this black catfish harmful to the koi?

in general catfish are bottom feeders and spawn are surface dwellers.. so
the catfish is unlikely to do any harm.. however if you are not feeding it
with proper sinking cat fish food it might get hungry enough to eat
anything...

what sort of catfish is it? some are purely vegetation eaters (algae
cleaners)..

cannot really answer your questions without knowing the type of fish though!

HTH

Lost