The Large-Size Fruit Fly (Drosophila melanogaster) cultures are supplied in special ventilated tubs measured 10 x 11 x 6 cm. Each culture comes with everything the flies need to produce hundreds of flies. Just keep them at room temperature for several days and they will begin to produce. The large-size fruit fly Drosophila melanogaster is an excellent starter feeder fly. This variety produces very quickly and reliably. Fruit flies are very nutritious, are high in protein and an excellent feeder for the larger top dwelling fish like Aplocheilus, Epiplatys, Topminnows, Channa, Cichlids, Wild Betta, etc. A good video culturing instruction can be watched here.