Largemouth larval pond pollution-free high-yielding technology

1. Feeding bait The larvae are fierce carnivorous fish. Their food intake is large and their food habits are wide. Under the condition of insufficient bait, they can eat each other and seriously affect the survival rate. Ingestion is generally based on meat-based diets, but it can also be artificially fed and fed together with pelleted food. 1 Feeding meat-feeding bait When the big-mouth bream species are just under the pond, the large zooplankton larvae and otters in the water are no longer able to meet their feeding needs. At this time, they should immediately feed bait fish paste and splash the whole pond. The method for preparing the fish paste is to cut fresh or chilled, high-quality, harmless squid into smaller pieces of fish, then mince it with a meat grinder, add water to the bucket, and mix and mix the whole pool. In the summer and hot seasons, fresh and high-quality quail bait fish can be used after being frozen. They are fed three times a day in the morning, afternoon and evening, from 9:30 to 10:30 in the morning and from 16:00 to 17:00 in the afternoon. From 20:00 to 21:00 in the evening, the bigmouth owl is highly predatory at night and should adapt to increase the amount of feeding at night. In order to ensure that the large oysters have sufficient food, the four resident fish or razorbush should be released simultaneously when stocking large oysters. Fish species, ratio of 1:30, bait fish should ensure high quality, disease-free, before the next pond to be disinfected by drugs to ensure that the bait fish is not directly or indirectly into the pathogen. When the largemouth bass is fed more than 20cm, the fish slurry will no longer be fed. At this time, the chilled oyster or the mixed fish can be cut into small pieces after being viscerally fed to the well-equipped food table, and can also be purchased without pollution. Bovine liver and other animal organs such as bovine lung cut into small pieces feeding, bait fish and animal internal organs with the rapid growth of fish, can be gradually cut slightly larger. Feeding amount is 8%-10% of the fish's body weight. When it is 0.25kg, the number of feedings can be reduced to 2 times. It is fed in the morning and evening, and the feeding amount should be increased appropriately. The feeding time is relatively elongated. point. 2 artificial domestication and feeding full-grain food pellets Although large-mouthed meat-based bait, but in the absence of bait fish or due to insufficient investment costs and other circumstances, can be artificially domesticated to achieve the purpose of feeding full-price pellet feed. The key technical measure for artificial domestication and bait feed is the use of lures. Lures are commonly found in fish gizzards, animal organs, minced meat, and leeches. Artificial domestication and pellet feeding should adhere to the principle of "Four Sets". Four 2-4 square meters of feedstuffs are set in the two ponds. After the bigmouth bass is planted, the attractant is used to feed the fish. Come to eat. Feeding artificial fit pellets can also be self-made, the raw materials are: white fish meal, bean cake, vegetable cake, wheat flour, corn flour and mineral additives and special vitamins for big oysters, etc. The crude protein content is 45.2%, and the full-price food for fingerling period The viscous strong powder should be suitable. The fingerlings should be fed three times a day at regular intervals: 9:00-10:00 a.m.; 15:30-16:30 p.m.; 20:00-21:00 p.m. The amount is 10-15% of the fish's body weight; the adult fish is fed twice a day, 9:00-10:00 a.m., 17:00-18:00 in the evening; the daily feeding is 5%-8% of the fish's body weight. . 2. Graded Rotation Grading Grading is the key measure to keep the specifications of the same pool large and clean, avoid two levels of differentiation, and prevent “big” eating “small” to increase the survival rate. The bigmouth bass pond is cultivated for 10-15 days. The body length is about 20cm at this time. It should be kept in separate ponds. The larger four-fish species in the pool should be pulled to the net and sieved with fish. The same size of fingerlings should be placed in the same pond. Careful operation should be done when sifting. Do not scrape the fish body. The fish should be disinfected. After 10 days or so, they must be sub-divided once. After the specification reaches 50-100g, it is no longer necessary. Divide the pool. 3, water quality regulation Pond water quality regulation is an indispensable technical link. In a pollution-free culture, maintaining a good ecological water environment is a basic requirement for aquaculture. Water quality requirements "Fat, live, tender, cool" dissolved oxygen is maintained at 5mg / L or more, pH value of 7.0-8.4, the water transparency is appropriate to 30-35cm, in order to achieve the purpose, the high temperature season should be changed once a week , change the amount of water to 1/3-1/4 of the pool of water, and every 10-15 days splash lime quick 20-30kg per mu is appropriate, played a role in regulating water quality and disinfection and sterilization. Anytime the unfinished residue leftovers float on the water should be picked up as much as possible. In order to ensure adequate dissolved oxygen, an aerator should be placed in the pool to turn on oxygenation in case of rainy weather and hot weather. 4, daily management adhere to three times a day in the morning and evening tour ponds, observe the fish feeding conditions and water quality, water color changes, observe the residual bait situation, adjust the amount of feeding, remove residual residue bait, check the big-mouthed activities, found that the problem in time Deal with, and do a good job in the recording of aquaculture production. During the process of fish disease prevention and control of largemouth bass ponds, due to their strong resistance to disease, in the case of full and detailed day-to-day management, largemouth worms generally do not suffer or rarely cause fish disease. However, we must adhere to the basic principle of “disease-free early prevention, disease early management,” and we must insist on the disinfection of fish species, aquaculture water bodies, and fishing tools, and strictly control the spread of pathogens. The use of disinfectant "chlorine dioxide" or "chlorinated" quicklime, etc., is splashed at the fish breeding stage and the season of susceptibility to disease, and the use of fishery drugs should conform to the "Guidelines for the Use of Non-Hazardous Food and Fishery Drugs (NY5071-2002)". Provisions. The large-mouthed oysters listed on the fishing market grow rapidly. After being fed for 5-6 months, the average weight can reach 2-4.5kg. To reduce the load on the fish ponds, speed up the cost-replay, and increase the efficiency, it is necessary to start catching and listing on the market and catch large and small ones. Prior to the listing of adult fish, it is necessary to stop the use of the drug in strict accordance with the withdrawal period of the "Guidelines for the Use of Non-environmental Food and Fishery Drugs (NY5071-2002)" and to stop eating for one day.

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