Sea bass make money and control the main points of culture techniques of freshwater bass

Bass is very popular with consumers because of its delicious meat. And because of the fast growth, wide adaptability and strong disease resistance of sea bass, it is deeply loved by fish farmers. Every year in March and April, it is a busy time for sea bass farmers, because a maximum of 2500 perch are raised in each mu of fish ponds, otherwise the growth rate of sea bass will be affected and it will not be able to catch up with the good prices in the bass market in June or August. Today, the editor will introduce to you the techniques of perch culture:

Perch

I. Pond construction

Choose to build ponds in places where there are abundant water sources and no pollution. Each pond is about 5 mi 8 mu, which is rectangular and runs better from north to south. The bottom of the pool is required to be flat, sand and mud bottom, the bank of the pool is firm, and the depth of the pool is 2 meters. It is necessary to bury the intake and drainage pipes at the bottom. At the same time equipped with 1 to 2 1.5KW aerator and generator set. Perch should be cleaned and disinfected before stocking, and can be sprinkled with 50 kilograms of quicklime or 5 kilograms of 10 kilograms of bleach per mu a week before stocking. Fertilize and cultivate the basic bait in the pond before seedling release, when the water in the pond turns oil green or tea brown.

2. Seedling cultivation

The sea bass seedlings with a body length of 1.5 cm and 2 cm caught from the sea area should be desalinated to 4-7 ‰ and then put into a temporary culture pond (salinity 1 ‰). The natural sea bass fry in the northern sea area is the best, because the fry grows fast and the individual is large, which can shorten the culture cycle and increase the economic benefit. The stocking density of the temporary pond should be controlled at 10 ~ 20,000 tails per mu, and the flushing water of the temporary pond should be flushed to increase oxygen frequently. Fresh baits such as zooplankton and red worms can be fed on the second day of the sea bass fry, and the fish paste, floating pellet bait and fresh bait can be mixed and fed slowly, and gradually domesticated to feed the sea bass with minced surimi and floating pellet feed. The daily feeding amount is 15% of the body weight of sea bass, which is fed in 3 times. During the temporary rearing period, 15ppm formalin or 0.3ppm strong chlorine was used to spray and disinfect the sea bass once a week. Three days before the bait was started, every 50kg sea bass was given 0.5g of dysentery, 3g of oxytetracycline and vitamin C1g, once a day in the fish feed for 3 days. After more than 20 days of feeding, the sea bass can be reared in large ponds as long as 4cm.

III. Feeding and management

The sea bass seedlings after screening were raised in different pools according to their size. The stocking density is generally 2500 ~ 3500 tails / mu. The water depth is more than 1.5 meters, and the pool water should maintain a suitable fatness, with the water color as oil-green and the transparency of 30 cm. The minced surimi and floating pellet feed with vitamin B and C were fed twice a day, and the daily feeding amount was 6% of the body weight of sea bass. Erythromycin, earthy mold poison and vitamin drugs should be mixed into the bait twice a month for 3 days each time. At the same time, the whole pond was disinfected regularly with 20ppm formalin or 0.4ppm strong chloride. Trichlorfon, mercurous nitrate and other prevention and control drugs should be used with caution. Pond patrol management should be done well every day. Muggy or at night to turn on to increase oxygen, pool water deterioration should be timely replacement of water, keep the pool water fresh.