CATDOLL : CATDOLL: How much can silver carp and bighead carp grow in a year under normal growth conditions without being fed?

Without feeding, it can grow 1-2 catties a year. The growth rate of silver carp and bighead carp is different in spring and spring in different growth cycles. However, when silver carp and bighead carp are raised under natural environmental conditions, the main food of fish is plankton. As long as there are enough plankton in the environment to ensure the food source of fish, it is no problem to grow 1-2 catties a year.

Additional information:

Silver carp and bighead carp (Aristichthysnobilis) are also called flower carp, fathead fish, Baotou fish, bighead fish, black carp (also called silver carp in some places), and male fish. They look like silver carp. They are flat on the sides. They are a kind of freshwater fish. They have a large and wide head, about 1/3 of the body length. They also have a wide, slightly upturned mouth. Their eyes are low.

Farming silver carp and bighead carp is mainly suitable for some lake areas. Take Jindeng Village, Jieshou Town, Gaoyou City as an example. The village has a total of more than 670 acres of net-enclosed water surface and adopts the breeding model of river crab trapping for silver carp and bighead carp. At the time of harvest, the income from silver carp and bighead carp alone increased by about 1 million yuan.

The lake is surrounded by a 2-layer polyethylene mesh fence with a mesh size of about 2 cm, with a dense net in the middle to prevent river crabs from escaping. Pebbles are used as sinkers at the bottom of the net, and the bottom of the net box is buried 10-15 cm into the bottom mud and compacted. Bamboo is used as stakes and plastic film fences are used around the lake, with a height of about 50 cm higher than the highest water level in the lake area. Aquatic grass planting can be planted in the case of a lack of aquatic grass resources in the lake area.

Release live snails: 150-200 kg of live snails per acre before Qingming Festival to provide natural active feed for river crabs.

Source: Silver carp and bighead carp Baidu Encyclopedia page link

Silver carp and bighead carp weigh about one kilogram a year.

Breeding technology:

Stocking of seedlings: In the past, the stocking specifications of bighead carp in lakes and reservoirs were generally large-sized fish of about 13.2M. Under modern technical conditions, the requirement is 0.15-0.5 kg/fish or even 1.0 kg of large-sized fish.

Stocking time: It should be carried out in winter or early spring when the water temperature is 5-10℃. This is conducive to high-density transportation of fish species, which can reduce casualties during transportation; the activity of fish species and ferocious fish is weakened, and the harm of ferocious fish to stocked fish species is relatively reduced.

Stocking location: A fertile bay upstream of the reservoir that is shallow, sheltered from the wind, and facing the sun should be selected. In this way, away from the spillway and flood discharge tunnel downstream of the reservoir, the chances of escape and destruction of stocked fish can be reduced, the time to adapt to the large water surface environment can be shortened, the growth can be accelerated, and the survival rate can be improved.

Free-range weather: Choose a sunny day, and avoid free-range on windy, snowy or icy days.

Quarantine and disinfection: Fish disease quarantine and disinfection must be carried out before stocking fish into the warehouse. It is strictly forbidden to stock fish with infectious diseases into the warehouse.

Careful operation of the fish handling: After the fish species that have been transported over long distances are transported to the reservoir, the reservoir water should be slowly added to the fish container. When the temperature difference between the water in the container and the reservoir water is not large, the fish species can be slowly released into the reservoir.

Food Habit Analysis

Under low-level aquaculture conditions in natural environments, bighead carp mainly feed on zooplankton.

A large amount of organic fertilizer must be provided to cultivate large phytoplankton, zooplankton and humus. When the water body lacks large plankton, the humus in the organic fertilizer is used as the main bait for silver carp.

Under fertile water conditions, plankton mainly consists of straight-chain diatoms, dinoflagellates, cryptoalgae, large curved rotifers, cladocerans, copepods and other species larger than 50 microns, which are exactly the filter-feeding objects of bighead carp.

Silver carp and bighead carp are mainly filter feeders. If the plankton in the pond is well cultivated, they can grow well without feeding. Its growth rate is different in different growth stages, and it is not a problem to grow 1-2 catties a year.