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Grouper rough standard
The grouper (Epinephlus) is of the order Perciformes, Serranidae, Epinephlinal, Epinephelsu Bloch. It is a common warm-water medium-lower fish in the coastal area. It often inhabits the seabed near the coastal islands, where the water is clear, the sediments are more than shore, and the water depth is 10-20 meters. In recent years, the expansion of export markets and rising fish prices have stimulated the development of grouper fish farming. However, due to the fact that its seed production has not been fully passed and the scale of production has not yet been reached, only the collection of natural seedlings for aquaculture has, to a certain extent, restricted the development of the grouper fish breeding industry. Moreover, the prevalence of stocking seedlings is much higher than that of large seedlings. Therefore, it is necessary to scale the fish to a certain size before it is released. In 1998, the rough grouper seedlings that we cooperated with Taiwan businessmen in the Wenchang Sanyinyu shrimp rearing nursery were blue grouper fry. The process is summarized as follows: First, the rough conditions 1. Place: Cement pond. The volume is 10-25 meters 3, rectangular, water depth 1-1.8 meters. 2. Illumination: Indoor cultivation ponds use natural light. Outdoor cultivation ponds should avoid direct sunlight during the day and foams can be used to control the light intensity. 3. Water temperature: The suitable water temperature is 22-29°C. It is necessary to prevent the water in the day and night: the drastic change in temperature. 4. Salinity: Wide salt, 10%. Above salinity can grow in water. The best salinity is between 25‰ and 29‰. 5. Water environment: To keep the environment quiet and the water quality fresh, it is best to keep the water for continuous feeding. The amount of water in and out of the water should be balanced and normal, but it should not be more or less. The pH should be maintained between 7.8-8.4, and the dissolved oxygen should be above 5mg/L. 6. Seedling density: According to the size and size of the fry, the size of the large can be sparse, small can be appropriately increased stocking density. Second, the bait series 2.4 cm above the fry can be fed fish, shrimp oysters, observed daily eating conditions, found that when the amount is insufficient to add a small amount of Artemia adults as a supplement, when the fry a total length of 3.6 cm or more, can be converted into investment Feeding fresh crushed fish, mixed prawn, or smaller live fish fry can be supplemented with artificial compound feeds that aid in digestion when the appetite is not good. Third, daily management to maintain stability and a good water quality environment must be always paid attention to management. Every time you feed, you must exchange old and new water. At the same time to observe the fry's food intake and satiation rate. Keep abreast of the amount of residual baits in the water, so that timely adjustments can be made. The work at the end of the day is very important and it must be done regularly every day. Found that the pool is dirty, change the pool in time. Keep a close watch on the physiological and ecological responses of the fry. Because of the individual differences in the growth rate of fry, the obvious differentiation of the group will cause serious mutual-residue phenomenon. At this time, it is necessary to carry out the screening and cultivation as soon as possible. Sorting fry can be done manually. That is, visually distinguish the specifications and then select a variety of different size screens. After being screened out, they were placed in each cultivation tank. Pay attention to handling carefully so as not to damage the body surface of the fish. A certain amount of drugs can be placed in the newly-introduced breeding ponds; prevention of infections caused by improper operation. Grouper is a meaty, ferocious fish. It is its nature to eat each other. There are three reasons for this phenomenon: 1 lack of feed; 2 large individual differences; 3 excessive stocking density. Therefore, in order to increase production efficiency, stocking density is a serious problem that cannot be ignored. It has been observed that the cultivating density after sorting should be maintained at around 3000-500/m3. When fish fry go to benthic life, over-concentration of groups sometimes occurs. The main prevention method is to keep the flow of water and cultivate the water quality. If a small number of diseased seedlings or weak seedlings are found, isolation treatment should be promptly initiated. Fourth, the disease due to grouper seedlings is marked in the high water temperature conditions, with the secretion of metabolites easily lead to water pollution. Therefore, it is easy to have a disease during the process of roughing. The most common cause was vibriosis and white spot disease. It has been observed that the majority of vibriosis is caused by the pool's filthiness, which usually manifests as rot in the ventral fins. However, white dot disease can occur under any circumstances, and it often appears as seasonal. The symptoms are rot and white spots on the head or body. After the above-mentioned symptoms are discovered, timely treatment is required, and comprehensive measures such as improving the water quality environment, medical treatment, and strengthening management are generally adopted. The drug treatment uses "Fukang Shrimp-FU" for medicinal baths, and the time is generally required to be more than 6 hours. Vibriosis uses "C-98" drugs for medicated baths. The above two diseases will often occur in combination, and the specific symptoms should be treated according to the specific conditions. In addition, during the process of labeling, due to the influence of external factors, virus-infected diseases also occur from time to time. We use the "hunger method" for treatment. The rate of survival of this method can generally reach more than 40%.