How to cultivate California perch in intensive cage

Intensive culture of California perch with cages can also achieve excellent economic benefits, and cages can be set up in reservoirs, lakes, rivers and ponds.

First, the cage is prepared and placed. The cage is a Rex-type double-layer covered cage with a specification of 4 meters × 4 meters × 2 meters and a mesh of 2.5 centimeters. The net row floating frame is made of Phyllostachys pubescens, double rows of bamboo overlap on the main road, single row of bamboo on the side road, and the cage is separated by 2 meters. The sunken son is a cement block weighing 1 kg each, 8 sinkers per net, and the bamboo raft is fixed with 6 cement piers, each weighing 60 kg (the cage area is set according to the needs, generally 16 to 30 square meters is suitable). The cage can be set in reservoirs, lakes, rivers and ponds, and the cage can be moved according to the change of water level to keep the water depth of the cage above 3 meters.

Second, the way of breeding. 1. Cage monoculture: the California perch is raised separately in a cage and fed regularly and quantitatively every day, resulting in a higher yield. two。 Cage culture: California perch is mainly raised in the cage, while the palatable silver carp and bighead carp are put into full at one time. In the process of culture, with the growth of California perch, silver carp and bighead carp, which mainly feed on plankton, are also growing in the cage, so the California bass in the cage have sufficient palatable bait and eat without external interference. Due to the gradual decrease in the number of bait fish, the feeding density of California perch can be maintained in a relatively reasonable range.

Third, culture technology.

1. Water surface selection: generally choose in the middle and upper reaches of the main river, the living area of the reservoir, near the auxiliary dam, and the deep water area of the lake, avoid setting up cages in the waters where the current is fast.

two。 The time of entering the box: according to the local climatic conditions, the fish can be put into the cage when the water temperature reaches more than 15 ℃. The earlier the better, the longer the growth time. The source of bait fish should be considered. if silver carp and bighead carp seedlings are used as bait, the breeding season of silver carp and bighead carp and the breeding season of plankton of silver carp and bighead carp in the water should be considered to arrange the time for California perch fry to enter the box.

3. Stocking density: California perch is raised in cages alone, with a suitable density of 20,25 per square meter and 68.0 per square meter. Silver carp and bighead carp were cultured in boxes at the same time, and their density was 250 to 300 times higher than that of California sea bass.

4. Bait: whether monoculture or captive culture, the bait fish of California bass should be palatable. If the body length of bait fish is more than 70% of California bass, it will be difficult to catch, swallow and bite, and will be stuck; if the individual is too small, the amount of bait swallowed every day will increase the feeding cost; the body length of bait fish should be 30% and 50% of the body length of California bass.

5. Timely sub-box: there is an obvious imbalance in the growth of California bass, and the individual size of California bass in the cage will vary greatly in a short period of time. In order to prevent each other from cannibalizing each other, and to determine the specifications of bait fish, they must be raised according to different sizes. Cage mesh size, to bait fish do not escape as the standard. If the mesh is too small, the exchange of water inside and outside the cage is not smooth, which will worsen the water quality in the box; if the cage is washed frequently, it will increase the labor intensity of cage management. The size of the first-class cage mesh of California perch culture is about 1 centimeter. When the California perch grows to more than 100 grams, it will be transferred to the second-class cage breeding.

6. Daily management: persist in inspecting the box every day, often cleaning the box, cleaning the cage every 15 days, in order to keep the water communication unobstructed and fresh, find rat holes or damage in the cage, repair it in time to prevent escaping fish. During the flood season, strictly guard against floods and torrential rains. According to the weather forecast, move the cage to a safe ventilation place before the flood and rainstorm. To strengthen the work of disease prevention and control, the California perch should be disinfected before entering the box and when it is divided into the box. The bait should be fresh and clean.