Large-sized fingerling breeding techniques for stingray
The cultivation of large-sized fingerlings of stingrays refers to the cultivation of fish seedlings of about 3 cm into 5-8 cm fingerlings. In the cultivation process, according to the characteristics of the stingray, we must seize a few key technical points to obtain high quality fish with high survival rate and robust physique. 1. Pond conditions: The area of ​​the nursery pond should be 1-2 mu, and the area is too large, which can easily cause inequality in the fingerlings and make fishing difficult. The water depth of the pond is about 1.5 meters, and the bottom of the pool is flat. About 20% of the drainage area is reduced by about 20 centimeters. The pond has less silt, better water retention performance, convenient access and drainage, quiet surroundings, and a little shade. Before the seedlings were released, the ponds were field-sterilized, zooplankton were reared and the fry were reared. 2. Seed stocking: 8000-10000 tails of summer flower seedlings with a length of about 3 cm per acre. The seeds are required to have neat specifications, robust physique, and no injury or illness. The seedlings should be strictly disinfected before the stocking. 3. Feed feeding: The amount of zooplankton in the pond after feeding seedlings can meet the feeding demand of the seedlings for several days. With the increase of individual seedlings, natural feed in the pond is reduced and artificial feed must be fed. Take a feed station in the pond. The area of ​​6-8 square meters per hectare of pond feed can be used. The feed is placed on the feed table. There are three kinds of feed preparation methods: (1) Mix and mix some of the fishmeal, silkworm cocoon powder, bean powder, wheat bran, and third-class flour, etc., after the minced fish are minced and knead into a pellet feed, or you can grind the small fish. After the slurry is formed, it is directly fed with the third-grade flour binding; (2) the powdery raw materials are mixed and then a certain amount of water is kneaded into a lump and fed; (3) the artificially-combined pellet feed is broken into micro-particle feeds. The formulas for the latter two compound feeds are: fishmeal 23%, silkworm cocoon powder 8%, meat and bone meal 8%, blood meal 8%, yeast powder 6%, soybean meal 17%, standard flour 23%, vegetable oil 3%, microsoule Mixture 1%, inorganic salt mixture 1.5, adhesive 1.5%. The feeding rate of general seedlings when they began to change their dietary habits was 10%, and gradually decreased to 5-6%. 2-3 times a day feeding, seedlings body length 3-5 cm when feeding 2-3 times a day, after feeding twice a day can be. 4, daily management: (1) Feed feeding should be regular, positioning, quantitative, qualitative. (2) Clear the food field once every 3-5 days and sterilize it once every two weeks. For feeding pelleted feeds, the number of disinfections can be appropriately reduced. Frequent removal of poolside weeds and pooled dirt. (3) Inspect the pond once a day in the morning to observe the activity of the water color and the fish. In the afternoon, combined with feeding or checking the eating situation, you will find problems and solve them in time. (4) Remove the earthworms from the pond at any time during the cultivation of the seedlings, and find that the water snakes, otters, turtles, and other predator organisms are dealt with promptly. Areas with more waterfowls must take effective measures to drive them away. (5) timely water injection to improve water quality. Water is added once every 10-15 days. SICHUAN UNIWELL BIOTECHNOLOGY CO.,LTD. , https://www.uniwellbio.com