Detailed Explanation of Key Technical Points for Tiger Grouper Fry Rearing
The tiger grouper is a type of grouper we commonly eat, and its farming area is relatively widespread, and it is not difficult to raise. However, many people do not know how to farm it. In fact, the most important thing before farming is rearing the fry. Only after the fry are properly reared can they be put into the farming pond for formal farming. So how should tiger grouper fry be reared? Below, the editor brings you the tiger grouper fry rearing techniques. Let's take a look together!
1. Fry selection
The selection of fry is very important. We must ensure that the sizes of the fry do not differ much, with a length of about 3-4 cm. When rearing fry, attention should be paid to density, and the stocking number should be controlled according to different sizes and growth lengths. Fry of different sizes should also be reared separately. When selecting fry, do not choose fry with obvious wounds, diseases, or weak growth, so as to ensure your farming benefits.
2. Reasonable feeding
When rearing fry, the bait is mainly small fish and shrimp, and the feeding frequency and feeding amount should be controlled according to the size of the fry. When the fry are 3-4 cm, the daily feeding frequency should be maintained at about 5-6 times; at 6-7 cm, reduce the daily feeding frequency by two times. At about 11-19 cm, feed about 3 times a day. No matter when feeding, do not feed too much; keep each feeding amount at about 5%-12%.
3. Timely water changes
During the rearing period, we should change the water at the proper time according to seasonal changes, bait feeding, and the growth of the fry. Usually, after each bait feeding, the water should be changed once. When changing the water, pay attention to the residual bait in the pond and the excrement produced by the tiger grouper. Do not replace all the water at once when changing water; carry out appropriate aeration and convection to prevent the oxygen content of the pond water from dropping, which is not conducive to the growth of the tiger grouper.
4. Separate rearing management
Tiger grouper fight each other relatively seriously, and the most serious occurrences happen during the fry stage. Because the individual sizes of the reared fry are different, if they are not reared separately, it is very easy for the strong to bully the weak and the big to eat the small, causing injuries and deaths. Therefore, during the rearing process, screening should be carried out about once every three days to ensure that the fry in each rearing pond are of consistent size and to reduce fighting. When rearing separately, pay attention to reasonable operation to prevent the fry from being injured.
5. Overwintering management
The overwintering work for tiger grouper fry is relatively important, so we should strengthen overwintering management and feed enough bait. Enhance the physique of the tiger grouper, improve its cold resistance, and help the fry pass through the winter smoothly. Also, when the water temperature is below 16, increase the temperature in time and keep the water temperature above 20 degrees, and its temperature fluctuation should not exceed 2 degrees. During overwintering, bait feeding can be appropriately reduced, and the amount can be kept at about 5% of the fry's body weight.
Before farming, we should understand the living habits of tiger grouper fry well, among which special attention should be paid to temperature. The tiger grouper is originally a tropical fish. Therefore, its cold tolerance is poor. During farming, prevent the water temperature from exceeding the range of 15-35. The lethal temperatures are 13 degrees and 37 degrees respectively, so everyone must pay close attention. That is all for today's introduction. This article is for reference only. Thank you for reading and supporting.