Feed is an important factor in fish rearing. Basically, the feed given must be easily digested and have high nutrition. In farming, especially ornamental fish, natural one of supporting factors success farming. Daphnia magna commonly used feeds for freshwater fish. Additives form carophyll main composition synthetic coloring materials, which are dominated by free astaxanthin (free astaxanthin) ...

Although carp is still widely sold and used in its fresh form, a range of value additions may also be observed. It is essential to know the development and management of a carp farm production costs and their evolution. In Iran, warm-water fish farming is based on common, silver, grass, and bighead carps. The carp is easy to rise in hatcheries in very large numbers at little cost, and is distri...