Practical experience of culturing sea bass

Perch belongs to Perciformes, Percinae, euryhaline fish. China's coastal areas are distributed, rich in resources. Perch has the characteristics of fast growth, wide adaptability, strong disease resistance and delicious meat. Loving people welcome. The farming techniques are as follows:

1. Construction of underground pond: choose a place with abundant water source and fresh water quality without pollution to build a pond. Each pond 5-8 acres, rectangular, north-south trend is better. The bottom of the pool is required to be flat, sandy and muddy, the bank is firm, and the pool is 2 meters deep. Bottom of the pool to be buried in the water, drainage pipes. At the same time, 1~2 1.5 kW oxygenators shall be equipped, and the farm shall have standby power generation units. Before stocking, the pond should be cleaned and disinfected. 50kg quicklime or 5~ 10kg bleaching powder should be sprinkled in the dry pool one week before seedling release. Before putting seedlings, it is necessary to fertilize the basic bait of the culture pool water, so that the pool water is oily green or dark brown.

2. Seedling cultivation: The bass seedlings (body length 1.5~ 2cm) caught from the sea area should be diluted to salinity 4-7‰ and then put into the temporary culture pond (salinity 1‰). The natural bass seedlings in the northern sea area are the best for stocking. Due to different physical and chemical factors, the seedlings grow fast and the individual is large, which can shorten the culture cycle and increase economic benefits. The stocking density of temporary culture pond shall be controlled at 10,000 ~ 20,000 fish per mu, and the pond shall be flushed frequently for oxygenation. On the 2nd day after entering the pond, fresh bait such as zooplankton and red worms was fed, fish slurry and floating granular compound bait were slowly mixed with fresh bait, and gradually acclimated to feed ground surimi and floating granular feed. The daily feeding rate was 15% of the fish body weight and was divided into three feeding times. During the period of temporary cultivation, 0.3ppm strong chlorine or 15ppm formalin should be sprinkled once a week for disinfection. Three days before feeding, 0.5g furazolidone, 3g oxytetracycline and 1g vitamin C should be taken orally for every 50kg fish. The fish should be mixed and fed once a day for three consecutive days. After more than 20 days of feeding, fish grow to 4~6 cm can enter the large pool to separate feeding.

3. Feeding management: sieving the perch seedlings and then feeding them in separate pools according to size. The stocking density is generally 2500~3500 tail/mu. Water depth of 1.5 meters above, to maintain appropriate fertility of the pool water, transparency in 30 cm, water color was oil green is appropriate. Feed twice a day, the main feed is ground surimi and floating pellet feed, feed to add vitamin B, C, daily feed amount of 6% of fish weight. Every month will also be soil mold poison, erythromycin, vitamin medicine mixed bait feeding 2 times, each time for 3 days. At the same time, the whole pond was regularly disinfected by sprinkling 0.4ppm strong chlorine or 20ppm formalin. Drug control should be careful with trichlorfon, mercurous nitrate and other drugs. Do a good job of patrol pond management every day, turn on oxygen at night or when the weather is sultry and the air pressure is low, and drain and change the water in time to keep the pool water fresh.

IV. Disease control: Perch has strong disease resistance and is not easy to get sick under natural conditions. However, artificial high-density culture is easy to cause diseases due to its living environment and space changes. Disease prevention must be strengthened, chemical disinfection of breeding ponds and food platforms should be carried out regularly, and diseases should be treated as soon as possible.