Baby catfish are called sac fry & subsist for 5 days on this, even after they hatch from the egg
The eggs develop, protected by the gravel, and hatch into baby trout called... [DOC] [TLE] Small-scale freshwater fish farming - Journey to Forever [PAR] Fish farming may range from 'backyard' subsistence ponds to large- ... baby fish 
production, while larger ponds are used for the grow-out ...