How Long Does It Take for Baby Fish to Grow?

By Staff WriterLast Updated April 09, 2020

Baby fish, or fry, are considered grown when they are able to fend for themselves at approximately 4 to 6 weeks, depending on the fish’s environment and diet. At this time, the baby fish can be introduced into a common tank.

The healthy adult female fish can give birth to baby fish every 4 to 8 weeks, depending on their diet, water conditions and temperature. When a fish is ready to give birth, move her into a separate 5 to 20-gallon breeding tank. Once the fish release the fry, remove her from the breeding tank. When the fry have outgrown the risk of being eaten, around 6 weeks, they can be introduced into the common tank. Feed the fry baby fish food, baby brine shrimp or crushed quality flake fish food.