NUTRITION
There are a variety of diets available for fish. Dietary requirements for individual species vary - indeed some fish require live diets to flourish. Most laboratory fish, including zebrafish, can be fed a flake or pelletized diet.
Commercially available fish diet
Some zebrafish strains that are fed live diets perform better. Treats such as live brine shrimp may be fed but care should be given since unwanted biological agents may be introduced into the water system.
Most fish can be fed once a day with an amount that can be consumed in a couple minutes. Overfeeding can be deleterious because the uneaten food may breakdown and overload the bio-filtration system.