Autumn tube pond fish catch and fattening

The golden autumn season is the peak season for fattening and fattening of fish. to do a good job of feeding and management in this period is the key link to increase fish production and improve economic benefits. The main measures are as follows:

Improving water quality and maintaining good water quality is an important condition for fish to gain fat. It is necessary to inject new water frequently and increase the amount of dissolved oxygen in the water. Generally, about 5-6 days to add new water, each change of water to 15-25 centimeters for degrees. Sprinkle quicklime solution 2 or 3 times a month to eliminate bacteria and increase calcium. Ponds with a general water depth of 1.5 meters use 10 kilograms of quicklime per mu each time.

Second, the air temperature and water temperature of topdressing bait in autumn are the best temperature for fish to gain fat. at this time, properly increasing the amount of fertilizer can accelerate the growth and reproduction of plankton and provide sufficient natural bait for fish. However, the temperature is still high in early autumn, fertilization should be carried out for a small number of times to avoid the deterioration of water quality and ensure that the water quality is fat and cool. Generally fertilize once every 10 days and apply 2 kilograms of urea per mu of pond to keep the water oil green or tea green. When the water temperature drops at the end of autumn, the application of organic fertilizer should be increased, generally about 250 kg of fermented manure per mu of water. The amount of fertilizer should not be too much, and it would be better to keep the transparency of the pool water at about 25 centimeters.

Third, reasonable feeding, the temperature drops obviously in autumn, and the temperature difference between day and night is large, so it is necessary to maintain adequate nutrition. In addition to ensuring adequate green feed, it is also necessary to increase the input of concentrate. Before putting in the concentrate, you should first feed the grass feed to prevent the grass carp from competing for the concentrate. The feeding place should be fixed, and it is appropriate to feed the fresh and tender dry grass, aquatic plants and green vegetable leaves, twice a day, each time within 2 hours. It is best to feed a variety of grass alternately to increase the appetite of fish and reduce the waste of forage. Pick up the leftover food in time. Supplement concentrate should be fed once a day from less to more. Between August and September, it is appropriate to feed concentrate daily at 3% or 4% of the total. In October, the temperature should increase appropriately with the drop in temperature, and eventually reach 5% to 9%, in order to ensure the nutritional needs of fish to gain fat. Concentrate can be selected according to local conditions, such as grain sprout, corn meal, bean cake, wheat bran, bean dregs and so on. Sweet potatoes can also be steamed and mashed, mixed with rice bran and corn flour (60 ∶ 35 ∶ 5), kneaded into balls and thrown on the feeding table. Conditional addition of 1.5% salt has a better effect. The table should be fixed at about 0.5 meters underwater, and the feeding amount should be flexibly controlled according to the daily eating situation of the fish.

Fourth, to prevent floating head into autumn, for fish ponds with high intensive culture density, due to large amount of bait and fertilizer, high content of organic matter and frequent fish activity, it is very easy to have anoxic floating head phenomenon, so it is necessary to strengthen pond patrol. It is appropriate to patrol the pond once in the morning and evening or at night, once it is found that the feeding of fish suddenly decreases, the eating time is prolonged, and the residual food in the pond increases, especially the grass carp swims all over the pond without eating, indicating that the water has begun to lack oxygen. For example, spray can be seen on the water surface during the day, and obvious waves can be seen on the water surface after the fish are frightened, indicating that dark floating heads have already appeared. If measures are not taken in time, it is very likely to flood the pool. When the fish is found to have a sign of floating head, the quickest way to take effect is to start the aerator in time to replenish the dissolved oxygen in the water, quickly discharge the water from the pool, add fresh water, and use 6 kilograms of quicklime or 2 kilograms of alum per mu, and sprinkle the whole pool to adjust the water quality after dissolving.

5. Prevention and control of fish diseases in autumn, fish have a strong appetite and are extremely prone to enteritis and Gill rot. To strengthen prevention and treatment, you can use bleach to hang baskets of 3 per mu, 100 grams of bleach and 150 grams of 95% crystal trichlorfon per basket for 5 consecutive days.