Daphnia are small crustaceans, which make a great food for both adult goldfish and fry.
I know fish is general love to eat live food. Daphnia seemed the easiest to culture. So I am thinking about feeding my neon tetra just daphnia. But I know that neon tetras are omnivores.
I'd also like to add that I went the extra mile and raised my daphnia from lab raised diapause eggs. I only use conditioned RO water, and pharmaceutical grade spirulina (and bakery grade yeast ). Snails raised from eggs by me. Plants cultured from stems by me. This prevents many of the headaches and risks of live foods to my fish because my daphnia are relatively pure and free of parasites.
Aquarium Frozen Fish Foods: Hikari Frozen Daphnia
Raising Daphnia for Tropical Fish Food - Article by Glen Thode
Our Daphnia frozen fish food has no antibiotics or additives, is higher in HUFA content than artemia, and provides a diet rich in the blue-green algae that helps produce brighter colors in your fish. Brine Shrimp Direct has secured a reliable source of one of Nature's most nutritious foods, Daphnia pulicaria, wild-harvested in the Pacific Northwest. Daphnia, a small crustacean also known as a "water flea," is organic and naturally full of the blue-green algae, Aphanizomenom flos-aquae (AFA), making it an excellent source of HUFA's, including Arachidonic Acid, Alpha-Linolenic Acid and Linoeic Acid. The daphnia is dried using a state-of-the-art low temperature drying process that results in better retention of nutrients and flavourants. Our Daphnia product contains no binders or artificial ingredients. The particle size ranges from 5 microns to 750 microns and is best suited for larval fish and fry. Dried Product Analysis: Crude Protein, 50%; Fat, 2.4%; Fiber, 10%; Ash, 19%; Moisture, 9%; Phosphorous, 1.4%; Xanthophyll, 180 mg. per pound.Live daphnia is a great food source for your tropical fish. We highly recommend it if you are raising small discus. It's very easy to grow if you follow the tips above. Your fish will love eating it.Fish Food: Daphnia - Daphnia are a superb live food for aquarium fish. By Skip Johnsen. Daphnia isn't usually offered tropical fish shops but it can be grown at homeDaphnia is also known as “water bugs” or “water fleas” due to their jerky motion. They live in freshwater and are really easy to cultivate at home. Daphnia can be used regularly to provide your fish with more variation, or seasonally to induce breeding. It can also be used as fry food for bigger fish. Unlike uneaten dried or frozen food, Daphnia will not foul the water – they will stay alive in the aquarium until the fish decides to eat them. Cultivating Daphnia at home is economical and will provide you with a constant source of disease-free live food. Author's Addendum: I have been a fish hobbyist for about 35 years and a professional fish biologist for 27 years. During many of these years I have had the opportunity to raise daphnia in containers ranging from 2 liter soda pop bottles up to 1,200 gallon vats. The above instructions will not guarantee you will have success with daphnia culturing but should go a long way to getting you started. Here I will share other secrets to success.
In 1992 I conducted an experiment to determine the best and most cost efficient feed to raise daphnia. This study was inspired by the sudden lack of a very good daphnia feed many hobbyists used in the 1970s through 1980s. Many hobbyists are familiar with Jim Langhammer's successful daphnia culture methods using "split pea and ham soup mix" fed alternately with baker's dried yeast. According to Jim Langhammer, the yeast seems to make the daphnia reproduce quickly, while the split pea and ham soup mix made the daphnia grow big and robust. The ham chunks in the split pea and ham soup mix served as food for tiny Dero digitata worms that shared the daphnia cultures. The dehydrated ham chunks would eventually sink to the bottom of the tank and the Dero digitata worms clustered and fed on the decomposing ham. These tiny worms, like miniature tubifex worms, are also a great food to feed small fish. This system worked very well for Jim Langhammer and I when first culturing daphnia. The split pea and ham soup mix could be purchased from bulk food stores. Sometime in the late 1980s to the early 1990s the split pea and ham soup mix suddenly became unavailable. Bulk food stores that carried it no longer did. So, I had to find a good substitute.
Doing literature searches on daphnia culture you come up with a bewildering array of ways daphnia can be cultured in the laboratory, primarily for toxicology studies. Everything from manure, yeast, live phytoplankton (micro-algae), finely ground trout chow, alfalfa meal, to snail manure (from apple snails), to soy flour and other finely ground foods have been cited as foods for daphnia. Often, some of these items don't serve directly as food for the daphnia, but the microorganisms like fungi, yeast, bacteria, and protists that grow in the water and are feeding on these items as they decompose is what serves as food for the daphnia. The critical component to using decomposing organic matter as food for daphnia is quantity. If too much is fed, the decomposing matter grows too much bacteria, causing the water to become too cloudy with ensuing water quality problems. IT IS VERY EASY TO OVER-FEED DAPHNIA CULTURES CAUSING CATASTROPHIC COLLAPSE OF THE COLONY. Not sure what kills the daphnia but it could be depleted oxygen, high ammonia, high nitrites, high nitrates or high phosphates. Something kills them off if overfed.