Freshwater grouper is a tropical fish, growing in freshwater and also in seawater with salinity below 10%. Its temperature range is between 25~30℃, when the water temperature drops to 20℃, the feeding is obviously reduced, and the body loses balance when the water temperature drops to 15℃, so the area where the pool water drops below 15℃ during winter is not very suitable for culture of this kind of fish unless there are heat preservation measures. It is better to keep the water temperature above 19℃ during the overwintering period. Freshwater groupers are demersal fishes, tolerate low oxygen, have strong disease resistance, and seldom have fish disease in the process of culture, so they can be mixed with tilapia and crucian carp to remove small fry in tilapia and crucian carp ponds, so as to achieve the purpose of high quality and high efficiency.　　Freshwater groupers are partial carnivorous fishes. At the stage of fry, the carnivorous character is quite strong, mainly focusing on plankton, and fry with big difference in individuals will kill each other, so attention should be paid to the management of graded ponds when breeding. Therefore, attention should be paid to the management of breeding in separate ponds. After breeding, the fry should be pulled out in time so that they will not be swallowed by the parent fish. Since the fry start to tame food, they will eat artificial feed, and can be fed with floating eel fish feed.　　Freshwater grouper hatchlings are 0.58-0.6cm in length, and they keep moving at the bottom of the pool, and the water temperature is 26~28℃. The yolk sac disappears on the sixth day after hatching, and the fish swims to the middle and upper layers of the water and no longer gather at the bottom of the pool, and after the disappearance of the yolk, the fry can be fed with small zooplankton such as rotifers and dendrobatraps, and then they can be fed with earthworms, and then they can be fed with eel feed in the shape of a doughnut to tame the bait, and then the fry will reach 10 years' length. After one month's cultivation, the body length of about 10cm can be put into the pond 1, fry land requirements: Freshwater grouper fry cultivation pool is good for earth pool, can also be used outdoor cement pool, the general area of a single pool of 50-100m3, the water depth of l-1.5 meters. Before stocking the fry, drain the pond, disinfect the pond thoroughly with quicklime, and fertilize the water with sufficient base fertilizer, so that the fry can eat the natural bait in the pond.　　2. Fry stocking: Before stocking, test the water. The specification of stocking in the same pool should be neat and consistent in size. The stocking density depends on the bait, breeding technology level and cultivation specifications, and the general stocking density is about 100 fishes/m3. Fry should be soaked in sop salt water for 15-20 minutes before entering the pool.　　3、Feeding: When freshwater grouper is in the pool, it feeds on zooplankton, and with the growth of fry, the intake increases, and the zooplankton in the pool gradually decreases. At this time, one can cultivate zooplankton through fertilizer, and the other can feed soybean paste. After 15-20 days of cultivation, when the fish fry reaches more than 3cm, its feeding behavior begins to change, then you can feed minced fish on the food table to tame the food, add a small amount of artificial compound feed mixed with minced fish after 2-3 days, then gradually increase the proportion of artificial compound feed and reduce the amount of minced fish until all of them are fed with artificial compound feed. The daily baiting amount is about 20% of the fish's body weight, and the bait is fed 3 times a day.　　4, cultivation management: (1), regulate water quality: in the process of fish fry cultivation, due to fertilization baiting, the remaining dung residue bait is most likely to spoil the water quality, for this reason, should be every 3-5 days to change the water once, each time the amount of water change for the water 1/4. can also be transplanted into the pool of some duckweed or water hyacinth and other aquatic plants in order to purify the water quality and to facilitate the fry to hide, eat.　　(2), timely sub-nutrient: when the growth of fish fry specifications appear large differences, because of its habit of eating small, therefore, in a timely manner through the sieve sub-nutrient. The same pool of fish fry, and strive to specifications consistent, so as not to affect the survival rate of fish fry.　　(3) Daily management: It is mainly to inspect the ponds and observe the situation of feeding, activity and water color change of the fry, so as to adjust the feeding amount in time and do a good job in preventing fish diseases.　　(2) Adult fish culture technology: Freshwater grouper can be raised in mixed culture, and two methods can be used in mixed culture: one is to mix a small amount of freshwater grouper in the pond, and mix the freshwater grouper 22-50 tails per mu of water surface, and after half a year's time of culture, the body weight can reach more than 300 grams on average, and the body weight can reach 500 grams after a year's time of culture. Secondly, the main fish is freshwater grouper, mixed species are tilapia, grass carp, crucian carp, etc. Each mu of water surface is stocked with 150-200 freshwater grouper and 300 mixed fish, and during the period of feeding, artificial feed can be fed, and fresh grass can be fed, and when there is insufficient zooplankton in the pool, appropriate amount of fertilizer is needed to cultivate zooplankton. After half a year of breeding, the average weight of freshwater grouper can reach about 200 grams, and after a year of breeding, the weight can reach more than 250 grams.