Experience of cultivating Pelteobagrus fulvidraco fingerling in Pond

According to the characteristics of larger size of Pelteobagrus fulvidraco fry, feeding habits similar to adult fish, strong population, increased food intake and strong adaptability to ecological environment, under the condition of high water temperature in the process of cultivation, we must grasp several main technical links according to the characteristics of Pelteobagrus fulvidraco in order to obtain high survival rate and strong physique. The cultivation can be carried out in ponds and cages, but it should be noted that the area of fry culture in ponds should not be too large, otherwise it is not conducive to feeding and daily management.

1. The pond conditions and the cleaning and cultivation pond area are generally 1 mu, because the area is too large, it is easy to cause uneven feeding of fish species, and brings difficulties to fishing operations. the pond water depth is about 1.5 meters, and the bottom of the pond is flat. the area of about 20% of the outlet is reduced by about 20 cm, less silt, good water retention, easy entry and drainage, quiet surrounding environment, and a little shading. Before releasing the seedlings, the pond should be removed and disinfected, and the zooplankton should be cultivated and the fish fry should be released.

two。 The small size summer flower fish (also known as fire fillet) of about 2 cm are required to be neat, physically strong, injury-free, disease-free, agile, powerful, and disinfect the fish by strict medicine bath. According to the production situation and pond conditions, the stocking density of fry is determined. Generally, the rearing density of adult fish in adult ponds before and after overwintering is higher, and the stocking quantity per mu is 8000000 / mu. For example, from July to August, the stocking amount of commercial fish per mu in separate ponds is 4000000 / mu. When the fish species grow to 8 cm, they can be divided into ponds, and then put into adult fish ponds to raise adult fish.

3. When feeding and feeding 2 cm seedlings, the amount of zooplankton in the pond can basically meet the demand for a few days. Between 2cm and 3cm of fish species, the best feed is active feed such as rotifer, copepod, Cladocera, Chironomus larvae and water earthworms. With the increase of individuals, the natural feed in the pond decreases. Artificial mixed feed must be fed to meet the feeding needs of seedlings. First of all, set up a bait table in the pond, and its materials should be made of bamboo mat, straw mat and colored striped cloth. The area of the bait platform per mu of pond is about 680 square meters, and the bait table had better rise and fall. Fix the bait table with a bamboo pile about 10 to 20 cm from the bottom of the pool, and then feed the bait on the bait table. There are three methods of bait preparation:

The main results are as follows: (1) the most commonly used method in production is to crush the small mixed fish and mix some fish meal, silkworm pupa powder, bean powder, wheat bran and third-grade flour into a ball-like feed, or the fish can be ground into pulp and glued with third-grade flour for direct feeding.

(2) mix the powdered raw materials evenly and add a certain amount of water to feed them into a ball.

(3) artificially mixed into processed pellet feed, and then crushed into micro pellet feed for feeding.

The preparation methods of the latter two kinds of compound feed are as follows: fish meal 23%, silkworm pupa powder 8%, meat and bone meal 8%, blood meal 8%, yeast powder 6%, soybean powder 17%, standard flour 23%, vegetable oil 3%, vitamin mixture 1%, inorganic salt agent 1.5% and adhesive 1.5%. In addition, more breeders use small miscellaneous fish to grind into meat paste and feed them directly in the pond. Feeding amount and frequency, the general feeding amount at the beginning of the conversion diet is 10%, and then gradually decreased to 5%-6% of the body weight. Feed 2 times 4 times a day, 3 times a day before 3 cm long, 2 times a day before the full length of 5 cm, and then 2 times a day. The nutritional standards of formula feed for Pelteobagrus fulvidraco fingerling are: crude protein 40%-43%, fat 8%-10%, carbohydrate 18%-23% and cellulose 3% 35%.

4. Daily management of breeding in the whole process of fish breeding, pond daily management is a meticulous, multifaceted and regular work, which is the key to improve the survival rate of fish species and make them reach large specifications.

(1) special attention should be paid to the "four determinations" when feeding feed every day, that is, timing, positioning, quantity and quality.

(2) clean the food farm once every 3-5 days and disinfect it with bleach (0.3-0.5 kg) every half a month. If pellet feed is fed, the frequency can be reduced appropriately. Often remove weeds and corrupt dirt from the pond, maintain the environmental hygiene of the pond, and prevent the breeding of harmful insects and germs.

(3) Patrol the pond once every morning to observe the water color and the activities of the fish, especially the floating head. If the floating head is serious, new water should be injected in time. Observe the changes of water quality and grasp the quantity of fertilization and feeding. In the afternoon, the pond should be inspected in combination with feeding or food inspection, so that problems can be found and solved in time.

(4) during the seedling breeding period, it is also the peak period for tadpoles and various harmful aquatic insects to reproduce. Tadpoles should be fished out of the pond at any time to prevent tadpoles from grabbing the feed of fish species. When water snakes, water centipedes and other enemy hazards are found, they should be dealt with in a timely manner. Areas with a large number of waterbirds should take effective measures to drive and kill them.

(5) timely water injection to improve water quality. There is a large amount of feed and excrement in the pond every day, and the pond water is easy to be overfertilized. Therefore, regular addition of water can improve water quality, prevent hypoxia flooding and promote the growth of fish. During the feeding period, water is usually added once every 10 to 15 days.

(6) Fish breeding stage is the most prevalent period of fish disease. During this period, attention should be paid to observation and various preventive measures should be taken. The most common disease of Pelteobagrus fulvidraco during this period is hemorrhagic edema disease. In addition to killing bacteria with disinfectant in the pond, tetracycline should be added to the diet of Pelteobagrus fulvidraco, 20 grams per kg feed, once a day for 3 consecutive days.