Live fish food include earthworms, sludge worms, water fleas, bloodworms, and feeder fish. Food for larvae and young fish include infusoria (Protozoa and other microorganisms), newly hatched brine shrimp and microworms.

How to use ?

Put them in small container and drop oxygen bubbles to it ,they can live in that 
as per your need you can feed them to your fishes 
keep water changes for every 3 days