Adult catfish will not get full off eating brine shrimp so this is only recommended for babies. If you do feed brine shrimp to adult catfish then make sure that you give them something else so that they are satisfied. You can buy cubed brine shrimp from the majority of pet stores. They can also live off pond algae but a diet based just on algae is not recommended. A variety of foods is best.
Catfish also love to eat chunks of white bread and wholemeal bread. However, if you do feed them bread, make sure that it is torn up into small bits for babies, and slightly larger for the adults.
Remember that catfish are ground feeders, you can tell this from the way they always tend to swim along the bottom of the tank or pond, so don’t give them any food that floats because they won’t reach it.
It is also essential that you do not overfeed your catfish, especially when you first get them and are enthusiastic about raising them because overfeeding will kill them.
If you want to find out more information on what baby catfish like to eat, then visit your local pet store. The owner might be able to give you some information or there might be a book there that you can buy and read through.
All catfish are different so it is important to try new foods with it and see which ones that they prefer. Some like to eat hot dogs whereas others prefer brine shrimp.