If it's a group of tadpoles, it will eat plankton, that is, a piece of the fish pond outside that does not look carefully out of the fish worms, casually outside the place where there is water, there is.

2cm-4cm blackfish, eat small fish, too small fish is not good to catch is also too little, just give some minced fish to feed them on the line.

Bigger blackfish will eat small fish and shrimp, especially small frogs can also be, you will be able to enjoy the scene of blackfish feeding.

The above mentioned is the snakehead fish, which is the blackfish stick, I keep it again, I don't know if you are talking about the blackfish or not.

If it is a tropical fish black marlin, then just feed small fish material breadcrumbs.