The golden period for fattening premium fish in autumn has arrived

As the saying goes: "People fear poverty in old age, ponds fear being empty in September." Golden autumn September, with clear skies and crisp air, is a great time to fatten and promote the growth of premium marine and freshwater fish. All localities must strengthen water quality management, practice careful rearing and fine feeding, and feed scientifically, so that these fish gain flesh and fat and all reach marketable size around New Year's Day, thereby increasing weight and income. The key techniques during the fattening period are introduced as follows:

1. Feed more at the right time and feed good feed, which should be determined according to the feeding habits of different fish. The mandarin fish is a fierce carnivorous fish, fond of eating live and fresh mud carp, Thai mud carp, silver carp, common carp, crucian carp, topmouth gudgeon and the like. Generally, the body length of the feed fish is about 1/3 of the body length of the mandarin fish; if too small, it is hard for the mandarin fish to eat its fill, and if too large, it cannot be swallowed. The daily feeding amount is about 3%-5% of its body weight, fed once a day; it is not advisable to combine several days' feed into one feeding, lest the fish go hungry at times and full at others. Small miscellaneous fish with hard spines on their dorsal fins (such as tilapia, etc.) cannot be used as feed fish, lest they prick the mouth, intestines and stomach of the mandarin fish. The largemouth bass is an omnivorous fish; if fresh wild miscellaneous fish are given, the feed fish should be cut into small pieces or minced into meat paste and mixed with peanut bran, soybean cake powder and cornmeal for feeding. Generally, feed twice a day at 10 a.m. and 5 p.m., with a daily amount of 5%-7% of its body weight; the barramundi also mainly eats chilled fresh small marine miscellaneous fish, with a daily feeding amount of 6%-8% of its body weight, and after a period of food training, it can also be fed specially formulated artificial compound feed. The eel mainly consumes artificial compound feed containing more than 40% protein; for every 100 kg of powdered feed, use 130 kg of clean water plus 5-7 kg of fish oil, put them into a mixer and mix them into a dough before feeding. For every 50 kg of eel, 2-3 kg of feed is used per meal, fed twice a day at 9 a.m. and 5 p.m., so that they eat their fill and eat well, grow quickly and become large easily. In addition, feeding should also be appropriately increased or decreased according to the day's cloudy or clear weather, water temperature, and the rise and fall of the fish's appetite, so as to improve feed utilization and the fish's growth rate.

2. Truly do a good job of regulating water quality. According to tests by relevant scientific research institutions, when the daily dissolved oxygen in pond water is maintained above 4 mg per liter of water, the amount of nutrients in the feed digested and absorbed by fish is also 2 times higher than at 2 mg of dissolved oxygen. However, if the water is relatively fertile and the plankton in the pond water (mainly algae) is very abundant, these algae absorb oxygen at night and before sunrise in the morning and release carbon dioxide; during this period of the day, oxygen is scarcest, which often makes premium fish swim hurriedly at the surface, consuming a great deal of energy, living uncomfortably and having poor appetite, causing the phenomenon of "one day of gasping at the surface, three days of no growth." If water is not added and changed in time, the appetite of premium fish will drop greatly, disease resistance will weaken, and they will soon fall ill. Therefore, in the morning or at night, first change 1/3 of the water, then increase the water depth to more than 2 m, so that the transparency of the pond water reaches more than 40 cm; in addition, for eel ponds, use 0.5 g of trichlorfon per cubic meter of water in the morning; for mandarin fish and @#@243@#@ ponds, use 0.5 g of copper sulfate plus 0.2 g of ferrous sulfate per cubic meter of water to disinfect the pond water, which can both kill the plankton that compete with fish for oxygen and achieve the purpose of purifying water quality and preventing fish diseases.

3. Do a good job of graded rotational culture and catching the large while replenishing the small. Many farmers mistakenly believe that after winter begins, as the weather gradually turns cold and the water temperature is low, most premium fish stop growing, so they seek convenience and often catch all fish, large and small, in one net and sell them all. This practice is not advisable, because mandarin fish, largemouth bass and others are eurythermal fish and will still forage and grow at water temperatures within 7°C, only growing slowly. Therefore, all localities must remind farmers that it is better to catch the large and keep the small, merge the small-sized fish into ponds for culture, strengthen management, truly do a good job of feeding, and implement off-season culture, striving to market them evenly this winter and next spring, so as to ensure increased fishery efficiency and increased income for farmers.