What Is the Right Stocking Density for Black Carp? Key Points for Scientific Stocking
AbstractThe suitable stocking density for black carp is about 800-1000 fish per mu. A reasonable stocking density can reduce the incidence of disease in black carp and also makes later pond management easier. During this period, silver carp or bighead carp can be polycultured, as these two fish species help improve water quality and can promote the growth of black carp, thereby improving the quality and yield of black carp.
1. Pond preparation work
Black carp are generally raised in ponds. The pond water must be clean, clear and plentiful, and the pond area should be moderate and not too large. The water depth in the pond is generally about 2.5 m, and the bottom should have as little silt and hollows as possible, so that leaking or seepage will not occur. Before the fry are stocked, the water in the pond must be drained completely, and the silt and excess debris in the pond must also be cleared away. Then the pond should be exposed to the sun or frozen for a few days. Immediately after that, lime powder is spread throughout the pond for disinfection. About 4 days after disinfection, the pond can be filled with water. Note that in the later stage, several more aeration machines should be prepared to prevent oxygen deficiency in the pond.
2. Stocking density of black carp
A reasonable stocking density for black carp makes full use of the pond water quality and feed, increasing the productivity of various fish groups and thus achieving the goals of high yield and high efficiency. To reduce the incidence of disease in black carp and make later pond management easier, the generally suitable stocking density is 800-1000 fish per mu, with silver carp or bighead carp polycultured during this period.
3. Method of releasing fry
When selecting fry, be careful to choose those that are not sick, are full of energy, have no wounds on the body and have a relatively large food intake, so as to avoid the weak being preyed upon by the strong among black carp. The selected fry should preferably be within 3 cm in size, and fry of other species must not be mixed in when releasing the fry. Generally, fry can be released in January-February, because the temperature at this time is just suitable for the growth of the fry, and the scales of the fry are relatively tight, so they will not be damaged. Then silver carp or bighead carp are polycultured, as these two fish species help improve water quality and can promote the growth of black carp.
4. Feeding method
To promote the growth of black carp, some artificially synthesized feed containing protein can be fed. During this period, a feeding platform can be built to make feed feeding easier, and the black carp can also be trained. Do not feed too much at one time, so as to avoid indigestion in black carp. Feed can be given many times in small amounts. After the black carp are trained, they can be fed at fixed times. In the later stage, as the black carp gradually grow, the feeding amount can be increased. During the peak growing season of black carp, they can be fed several more times to promote rapid growth.
5. Water quality management
To strengthen the management of black carp, check once each morning and evening to observe the growth status of the black carp and whether the water quality is good or bad. During this period, the pond water must be topped up or replaced at regular times to keep the water quality good. Healthy water quality is greenish, and a transparency of 50-60 cm is sufficient. In summer, black carp grow faster and their activity is stronger, which also increases their food intake. Summer temperatures are relatively high, which can easily cause oxygen deficiency in the pond, so pay more attention to the dissolved oxygen level in the pond water. Oxygen supply equipment must also be kept working, and disinfection work must be done well.