The southern bigmouth mullet is an excellent aquaculture species currently popular among consumers and producers. It has many advantages such as strong adaptability, rapid growth, wide appetite, and high yield, especially when it is fed with compound feeds, and can adapt to scale and intensification. Artificial breeding needs, economic benefits are considerable. First, the advantages of compound feed to feed the southern bigmouth bass is a fierce carnivorous fish, its wide appetite, large appetite, in the natural waters like to prey on a variety of fish and shrimp and aquatic insects, and similar disability is serious, and even can devour It is equivalent to 2/3 of its own body length. Under artificial breeding conditions, after domestication, it can be completely switched to artificial diets for feeding, and has good adaptability to compound feeds, large food intake, and high population yield. In the past, large-mouth bred broth was commonly fed with fresh live animal feedstuffs, including various wild fishes, domestic fish seedlings, tilapia larvae, animal viscera, earthworms, fly maggots, snail meat, and livestock entrails. . The amount of these feeds is extremely limited, nutrition is relatively single, and the environment is seriously polluted, and it is easy to induce various fish diseases. It is suitable for small-scale farming of farmers or fishermen. Formulated with scientific formula, the compound feed has a comprehensive nutrition and a low feed coefficient, and the feed can eliminate some toxins, kill pathogens and parasites, and reduce the probability of occurrence of fish diseases during processing. At the same time, during the process of feed preparation, appropriate amounts of drugs can also be added as needed to prevent fish diseases more effectively. Second, the southern large oysters on the nutritional needs of feed The southern large oysters in different breeding period on the nutritional requirements of compound feed slightly different. During the broodstock incubation period, the crude protein content in the compound feed was required to be more than 40%. In the breeding period, the feed ingredients require: crude protein 42% to 48%, crude fat 8% to 10%, sugar 25% to 30%, crude fiber 6% to 8%, plus a certain amount of vitamins and inorganic salts . During adult culture, the crude protein content is required to be 36% to 42%, and the particle diameter is 3 mm to 5 mm. The basic ingredients of artificial compound feed are fish meal, silkworm cocoon, blood meal, bean cake, rapeseed cake, Corn and wheat, plus vitamin and inorganic salt mixture. III. Feeding Technology for Feeding of Southern Largemouth Flies in the Forage Breeding The southern bigmouth clam is a ground-level fish that lurks in the hiding place of low-water light in the daytime and disperses into the water layer during the night to feed. It is not good to jump, it will not drill mud. The water temperature for survival is 0°C to 38°C, and the suitable water temperature for growth is 12°C to 31°C. The optimum temperature is 25°C to 28°C. At a suitable temperature, it feeds vigorously, grows rapidly, and the body maintains a good state of new generation. In the feeding process, we must grasp the following technical essentials: 1. Feeding principles should follow the principle of “timing, fixed-point, quantitative, and qualitativeâ€. Domesticated large-mouthed fish should focus on floating hordes to avoid food loss in order to reduce the loss of bait. It helps to observe the fish feeding situation. 2. Feeding method (1) Domestication Feeding and domesticating When the feed bucket or pot is struck first, conditioned reflex is formed. Daily domestication 2 or 3 times, at 7:00 am to 8:00 am and 4:00 to 5:00 pm, in accordance with the "slow-fast-slow" rhythm and "less-more-less" principle to grasp feeding rate and vote Feeding quantity, domestication process is 7 days to 12 days. When 70% of the fish species have been able to ingest artificial compound feed, artificial compound feed can be completely fed twice a day. (2) Routine feeding The daily feeding should be based on the feeding rhythm of the bigmouth bass. There are many fish groups, many casts, and quick casts. There are fewer schools of fish, fewer casts, and slower casts. When the fish rush to eat is not active or active, it stops feeding. Where conditions permit, after feeding compound feed, some fresh live animal feeds can be properly fed and the effect is better. Generally, it is fed twice a day. In the processing of feed, it is necessary to pay attention to the fine grinding of the raw materials as much as possible, and the quality of the binder is better, so as to ensure that the feed pellets are not loose in the water for about one hour, thereby improving the utilization rate of the large oysters. (3) Feeding cages Feeding large clams in cages. Smaller individuals feed on the middle layer of the water. Larger individuals feed on the bottom layer. Small individuals love soft feeds. Slightly larger individuals are willing to feed. Swallow dry pellet feed. The bigmouth owl prefers to inhabit in the box weeks and 4 box corners. Therefore, a feed table must be set up in the cage and hung in the box at a distance of 20 cm to 30 cm from the bottom of the net. When feeding, the feed is put on the water surface above the feed table and swallowed by the large oysters as the feed pellets gradually sink. 3. Feeding amount The feeding amount should be flexibly controlled according to the water temperature, water quality, weather, fish size, and actual food intake. Each feeding is no longer a cluster to catch food. The general standard for the specific feeding amount is: when the large-mouth bream is 5 cm to 10 cm in length, the daily feeding rate is 8% to 10% of the fish, and the daily injection is 3 to 4 times; the total length is 10 cm to 13 cm. The daily bait rate was 4% to 6%, and it was fed 2 to 3 times a day. After 23 cm in total length, the bait rate could be reduced to 1% to 3%, and the daily feeding rate was 1 to 2 times. The last feeding every day can be arranged around 10pm. Fourth, the southern largemouth bream farming management technology 1. Water conditions Pond culture, the required area of ​​more than 5 acres, depth of 1.5 meters to 2 meters, water should be sufficient, easy access, drainage, it is best equipped with aerator. Disinfection of clear ponds is required prior to planting to kill pathogens and wild fish in ponds and reduce the chance of fish disease. In cage culture, the water surface is required to be relatively open and sunny, there are certain wind waves, the water depth is more than 5 meters, the transparency is about 1 meter, and the water temperature above 22 degrees Celsius for 3 months to 5 months throughout the year. When paddy fields are farmed, it is advisable to select fields with sufficient water supply, energy discharge, drought-free, flood-flooded, and good-quality, non-polluted land, with an area of ​​about 1 mu. 2. Breeding methods The large-mouthed rearing methods mainly include pond breeding, nest raising and cage breeding. When the pond is raised, 800 to 1,000 tails per acre are planted, and the specifications are 8 cm to 12 cm per tail. Feeding for 140 days to 150 days, commercial fish with an average tail weight of more than 500 g can be cultivated in that year. In small ponds with large wild fishes, some large-mouthed species of fish can also be properly stocked, which can reduce the main fish’s fight for food and suppress the occurrence of fish diseases, and increase production and income. When cages grow into adult fish, 120 to 150 tails of large-mouth bream fish weighing about 25 grams each can be stocked. The fish stocks that are required to be stocked are of good quality, neat in specifications, robust in physique, and free from disease and injury. 3. Adjust water quality When ponds are cultured, change the water once every 3 days to 5 days. Change the water of the pool by 1/4 to 1/3 each time. If the pond has micro-flowing water for a long time, increase the amount of stocking. When cages are cultured, they should be brushed and washed frequently to ensure that the water inside and outside the tank is fully exchanged. Fifth, prevention and treatment of diseases Big mouth lice are more resistant to disease than other fish, and few common diseases. At the stage of adult fish, it is easy to suffer from enteritis disease, print disease, rickets, etc. The causes of these diseases are often poor surface disinfection, excessive stocking of fish species, failure to timely improve water quality, feeding pathogens, etc. . Therefore, prevention should be the first priority. Fish should be disinfected before entering the water, and water should be disinfected with quicklime once every half. Once onset, it should be treated promptly. In addition, in large-mouth breeding, it is necessary to strengthen management, prevent damage, prevent escape and prevent startle, and create an excellent external environment for its growth.
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