How to get fat for fish, shrimp and crab in autumn

First, change water reasonably and cultivate fertile water. Since May, "bait" and "liquid" have been used to control diseases and insect pests every other month or 20 days. In the transitional period of summer and autumn, more attention should be paid to the regulation of water quality; to prevent the pool water from becoming "turned" or "old", and to maintain the appropriate transparency of fertilizer and water. The transparency of fish ponds is about 25 cm, that of shrimp ponds is 30 to 36 cm, and that of crab ponds is 35 to 40 centimeters. If the transparency of the pond water is less than the normal needs of fish, shrimp and crabs, use quicklime 5 to 7.5 kilograms per mu in time to regulate the water quality, which is greater than the growth needs of fish, shrimp and crabs.

Second, feed reasonably to promote fattening and gaining weight. After the Beginning of Autumn, the quality and quantity of fish, shrimp and crab should be improved. The daily feeding of fish is 5 to 6 percent of the total amount of fish; the daily feeding of shrimp is 7 to 8 percent of the total amount of shrimp, and the fresh protein feed accounts for 60 percent of the feed; the daily feeding of crab is 10 percent of the total amount of crabs, and the protein feed accounts for 65 percent of the feed; the daily feeding of Loach is about 6 percent of the total amount of Loach, and the protein feed accounts for 60 percent of the feed. The daily feed intake of farmed fish, shrimp and crab decreased with the gradual decrease of air temperature and water temperature from October to November, and the daily feed intake was about 3% for fish, 4% for shrimp, 4% to 5% for crab and 4% for Loach.

Third, rational use of drugs to prevent and control diseases (pests). Every 20 days or so after the establishment of autumn, chlorine dioxide and other pollution-free drugs are sprinkled in the whole pond (if shrimp and crabs get sick in the pond, use 200 grams per mu, once a day, for 3 to 4 days as a course of treatment). At the same time, add "shellfish", "calcium tablets", "oxytetracycline" and other drugs to feed, once a month, each time accounts for about 0.5 parts per thousand of the bait. Every morning and evening, we should also continue to patrol the pond to observe the eating situation, decide the amount of food to be fed the next day, and at the same time achieve the "second prevention" work of preventing theft, flight, and enemy harm.