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How to develop gums?
(1) The choice of farm site: The success of farming has a lot to do with the environment of the site. Gill culture requires seawater cleanliness, no pollution, no red tide, good water exchange, high oxygen content, water temperature Suitable and so on. For gums, pay special attention to the high temperatures in summer. If it is longer than 28°C, it is not suitable for breeding gums. The salinity can't be changed too much. It's difficult to follow the following steps. The sudden drop of salinity is too low and the gums can't stand it. This is often the case in the sea near the estuary. Therefore, the site selection is based on the sea, and the seawater temperature should be suitable. If the site is far away from the sea and water is supplied through a long ditch, conditions such as temperature may change. In addition, if cage culture is required, network wave invasion, theft, and ship accidents must be considered. In a farm where the sea temperature is too high in summer, consider deeper seawater wells. The water temperature in the seawater well is not too high, and it is mixed with seawater at a suitable temperature. (2) Condition of the rearing pond: The shape and structure of the pond is basically the same, but the area is larger and deeper, the larger one is 30-100 cubic meters, and the gums sometimes jump out of the water, so the wall construction should be higher than the actual water depth. 30-50 cm. Ponds are big to consider when changing water is not easy, and stocking densities are smaller. (3) Feed and feeding: The bait is mainly used for small, economical fish. It is best fresh. However, it is difficult to guarantee the supply of fresh fish, so it is generally frozen. From the price and convenience of feeding, Yujin fish is better. Jade fish can be fed whole, and larger bait fish must be cut to size or ground into minced meat. Artificially cultivated gums can be used to feed minced bait. The advantage of this kind of bait is that it is easy to add nutrients, but the big disadvantage is that it is easily dispersed in water, and the loss is large, often causing deterioration of water quality. In order to prevent disease, pay attention to the quality of the food. The daily feeding amount is about 1-3% of the weight of the cultured fish, and it is usually cast twice a day. Feeding amount is just a reference number and the actual feeding should be based on the food intake on the day. If the temperature is too high or too low, or if the water quality is not good, the fish will lose their appetite and they will not feed or feed less. The amount of bait should be eaten on the same day and no bait should be left. (4) Stocking densities and water changes: Density of stocking is closely related to the amount of water exchanged. Larger water exchange, higher density, higher water temperature, and larger water change are required. If you can not increase the amount of water, the density will be smaller. At the current breeding level, the bottom surface of one square meter can raise 5-15 kilograms, and in the high temperature season (above 25°C), change the water every 2 hours. (5) Cultivated cage specifications and stocking densities: There are no fixed specifications for the size of cages. There are 443 meters and 883 meters. There are also bigger or smaller than this. The shallowest cage is only 0.5 meters. As the fish grows, it should not be too shallow. After the fry are put into the cage for the winter, it can be considered to put about 45 per square meter and raise it till the end of the year. (6) Specifications for farmed products: Better levels, and 800-1000 grams can be obtained in a year and a half of cultivation. Generally reach 400-500 grams. In the northern regions, artificial breeding hatches from the spring and can be marketed from one winter to the end of the second year of the year, which is a relatively short time. If you want to raise even more, you will have to go through the winter again, except that in order to keep a small amount as a broodstock, it is not cost-effective to survive the winter. (7) Advantages and disadvantages of pool culture and cage culture. The advantages of pool culture: 1 It does not move like a cage. The fish is more stable and has fewer injuries. 2 It is easier to observe changes in the body color and feeding of fish, and the disease can be found earlier and treated earlier. 3 management, out of the pool is also relatively easy. The advantage of cage culture is that it does not occupy land and saves facilities such as pumping. Not afraid of power outages and other machine failures, but in bad weather, feeding and other very inconvenient, in case of strong winds and waves, vulnerable to damage.