Experience of perch culture in shrimp ponds

In recent years, perch has become an important breeding species in northern China, especially in shrimp ponds, with short time and quick effect. This technique is worth popularizing in a large area. The breeding experience is introduced as follows:

The size of the prepared culture pond is 1.3 hectares ~ 2 hectares, and the water depth is about 2 meters. The bottom mud and sand of the pond can be used. It is best to dig a deep drainage ditch in the middle of the pond and ensure that there is no pollution around the pond. Use the winter leisure time to scrape off the blackened layer on the surface of the shrimp pond with a bulldozer, let the bottom of the pond be fully exposed in the sun, and then clear the pond with 50 kg ~ 60 kg quicklime every 15 ha.

Fertilizer ponds and stocking sea bass seedlings were watered in late March and applied organic fertilizer to breed the basic bait in shrimp ponds. Choose healthy sea bass fry with a size of about 150 grams, no scaling, no trauma and sensitive response to external stimuli. In this way, after 3 ~ 4 months of careful feeding, it can reach more than 500 grams per tail in September, and the culture survival rate should be more than 95%. Sea bass fry are best released in May, with 800 ~ 1000 larvae per 15 ha. Before release, wash with trichlorfon solution with a concentration of 0.2 mg ~ 0.3 mg / kg for 3 ~ 5 minutes to remove parasites on the body surface and gills of sea bass. Be extra careful when using trichlorfon, because sea bass are sensitive to trichlorfon.

The bait is mainly fed to shad, sand drill, frozen mixed fish and shrimp, and at intervals to feed shrimp (frozen). The appropriate feeding amount is 8% to 10% of the fish body weight, twice a day, in the morning and evening respectively. The body weight of sea bass was measured every 15 ~ 20 days, and the feeding amount was adjusted according to the body weight. Rinse the bait to prevent contamination of the pool water and cut it into small pieces if necessary so that the bass can eat.

Domestication should be carried out to domesticate the perch so that it can unify the cluster facilities. You can choose a facility in a shrimp pond and feed it at 5: 00 a.m. to 6: 00 a.m. and 5: 00 p.m. every day to form a conditioned reflex. When feeding, first put a small amount of bait to attract sea bass to feed, and then throw more when most fish clusters feed, until 70% or 80% of the fish are full. In this way, after 20 days of domestication, the bass raised in the pond will be fed at a fixed point.

Control water quality before the sea bass fry enters the pond, the water level is controlled at about 1 meter, and then 5 cm ~ 10 cm water is added every day. A small amount of water began to be changed at the end of May, generally every 5 ~ 7 days. The amount of water changed gradually increased after late June, 10 cm ~ 15 cm per day, and after late July, 1 pound per day. At the same time, always pay attention to the change of water color in the pond.

To prevent and control diseases, it is necessary to pile and hang medicine bags in sea bass facilities to disinfect and kill insects. Irregularly in the bait mixed with drugs, in order to achieve the purpose of disease prevention, and often observed, found sick fish, dead fish, timely diagnosis, the right medicine.