Stingray has become a breeding species for many fishermen and farmers, but the author found in the household guidance that many farmers in the breeding process, due to the unilateral pursuit of high yield, continue to put too much bait, fertilizer, etc. to the aquaculture water, This will not only increase the cost of breeding, but also worsen the water quality, affect the growth of stingrays, and ultimately lead to reduced breeding efficiency.
1. Thoroughly clear the pond, both old and new ponds must be cleaned and disinfected. Old ponds should be cleaned of excess sludge, leaving only 10 cm of sediment. 10 to 15 days before the stocking of the fish, the disinfection of the pond is carried out with drugs to kill pathogens and enemy organisms in the aquaculture water. Generally, dry cleaning ponds or water clearing ponds can be used. When dry pond clearing, you can use about 75 kilograms of quicklime per mu or 4 kilograms to 5 kilograms of bleaching powder; 150 kilograms of quicklime per acre can be used when clearing ponds with water. Splash around the whole pool, try to mix the mud and lime at the bottom of the pool to completely kill parasites, pathogens and wild fish, reduce the content of food and improve feed utilization.
2. Reasonable stocking density can improve feed utilization. Appropriate matching varieties can make full use of feed to improve feed efficiency. In order to make the survival rate of stingray culture high and the feed to reduce waste, it is necessary to control the stocking density and the rearing of fish. When the fingerlings are put into the market, large-sized fish species of about 30 g/tail should be selected for adult fish breeding. As the fish grows up, in order to adjust the breeding density and improve the efficiency, it can be arrested and listed in batches and wheeled to adjust the amount of fish in the water to improve the return of feed.
3. Scientific feeding In the process of stingray culture, the input affects both the growth of the fry and the change of water quality. If the amount of feed in production is greater than the amount of food intake, it will cause waste of bait, increase the cost of aquaculture production, and lead to pollution of the aquaculture water environment; if the amount of feed is lower than the food intake, the rapid growth of the culture object will not meet the demand for nutrients. , the growth is hindered, and the effective utilization of the bait is correspondingly reduced. Practice has shown that a combination of a reasonable feeding plan and the experience of the farmer is an effective means of ensuring a more suitable amount of feeding. The amount of bait that should be thrown every day should be flexibly controlled by the producer based on the environmental conditions such as the current day, the current climate, and the water temperature. The whole feeding process should be divided into three stages: the first stage is feeding 4 times a day in May and June, and the daily feeding rate is 3% to 5%; the second stage is feeding 3 times in July, August and September. The feeding rate is 2% to 3%; in the third stage, the bait is taken twice a day after October, and the feeding rate is 2%. The feeding needs to be “four fixed†and “four lookingâ€. The daily feeding time and the number of times depend on the weather and water temperature. The specific feeding amount is to eat the stingray without leaving it. In addition, due to the large mouth crack of the stingray, the grain size of the bait should be correspondingly increased. The granular material with a diameter of 2.0 mm is used as the open feed, and the size of the fish material can reach more than 5 mm. The use of a sinking hard particle bait requires that the pellets have a 15 minute stability in the water, while the use of floating bait will improve the bait utilization.
4. Adjust the water quality. Fish farming first raises water, and the quality of the water affects the growth rate of the stingray and the bait coefficient. Stingray enjoys fresh water quality, good water quality, rapid growth, and few diseases. It can make full use of bait and reduce the feed coefficient. In the whole production process, we should always insist on cultivating and maintaining fresh water, sufficient dissolved oxygen, and take timely measures to detect abnormalities, add new water, change water or apply water quality improver. In the middle and late breeding period, it is necessary to change the water of the pond by 1/3 to 1/2 every half month. When entering the water, use the 80 mesh screen to wrap the water inlet to prevent the fish from entering. The pond with 5 acres of water is equipped with two sets. The kilowatt aerator, the aerator is usually open in the morning and afternoon.
5. Daily management insists on daily inspection of the pond. According to the water quality, weather, food intake, etc., observe the activity of the fish, timely remove the sick fish and dead fish, and keep the water in the pond clean. Disinfect the food field once a week, pay attention to changes in water color and water level, and check whether the inlet and outlet screens are intact, so that they can be refurbished in time. Put some water floating lotuses around the pond to accommodate the living habits of the stingrays at the bottom of the pond during the day and swim out at night. Through careful management, the stingray maintains the fastest growth rate, thereby reducing costs and achieving maximum economic benefits.
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