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First, fish species
The pond has an area of ​​about 2 mu, a water depth of 2.0m, and a sunny leeward, with 20,000 fishery species per mu. And before the pond (water temperature around 10 degrees) stop feeding for 7 days, choose good weather to pull the net to exercise 2 times, and then conduct screening, count, and pond. It is necessary to carry out single-stocking in separate ponds, that is, to stock the same species of fish in the same pond. Pool water should maintain an irregular temperature, and fine weather (temperature above 6 degrees) needs to put a small amount of feed. After the fish pond is frozen, it is necessary to knock on the ice to vent, to prevent the fish from anaerobic death, and at the same time to prevent the waterfowl from harm.
Second, broodstock
Before wintering, the brooding pond should be filled with water as much as possible to make the ice depth reach 1.0-1.5m, and appropriate amount of farmyard fertilizer should be used so that the frozen pond water can maintain a certain amount of plankton, which can not only maintain the pool water necessary The dissolved oxygen content, and loose mouth to meet the cricket, quail and other weak food needs. After icing, you should cut an ice eye or use a handsaw to cut a piece of ice down the wind. Where the water temperature is high, feeding, fertilizing and injecting new water can still be properly performed.
Third, the trout fish species
Choose a pond that is leeward and sunny, with an area of ​​1 mu -3 mu and a water depth of 2.0m or more as a wintering pond. When the water temperature drops to about 10 degrees, choose sunny and wintering ponds, and the specifications for each mu will be from 3000 to 5000 fish species with a length of 10cm to 15cm. 15 days before the net is pulled, the number of bait fish in the pond should be gradually controlled; operations such as pulling nets, fishing, selecting fish, and transportation should be carefully performed to avoid injury to the fish. To maintain a certain degree of water quality, a certain amount of bait fish can be put in the pond for feeding. In areas with long ice-sealing seasons, oxygenation measures should also be taken to prevent the lack of oxygen in the ponds.
Fourth, Huang Hao
Before entering the winter, Astragalus need to eat a lot of storage nutrients, because when the temperature drops to about 10 degrees, it should be fed high-quality feed, so that it can reach a fat body, is conducive to safe winter. When the temperature dropped to 15 degrees, the yellow eagle was in a dormant state. It did not leave the hole nor feed. At this time, the pool water could be drained. In order to keep the bottom mud moist and warm, a small amount of straw and turfgrass can be covered on it to avoid freezing and cause frostbite to die, and to prevent damage to rats and livestock.
V. Green shrimp
The overwintering of larvae and broodstock is mainly due to the selection of ponds with more specifications, sheltering from the sun, water depths of more than 1.5m and more aquatic grasses as wintering ponds. In general, 150 kg-200 kg of water fleas or 25 kg-35 kg of willow roots can be planted per mu. The selected individuals with robust physique, complete appendages, and body size standards were used as winter broodstock, with female broodstock specifications of 200/kg-500/kg, and male broodstock specifications of 140/kg-240/kg, male and female ratios. 2:1, stocking density 15kg/mu -25kg/mu. If the juveniles are overwintering, they should start from late December and choose sunny stocking. The juveniles should have a size of 2000/kg-3000/kg and a stocking density of 20kg/mu - 40kg/mu. In sunny weather, every feed needs to be fed with 1kg/mu -2kg/mu, once every 7 days - 10 days, and the feed requirements are small and fine. It is managed by special personnel, regular inspection, and prevention Pollution, work against enemy and harm. During the severe winter season, it is necessary to prevent the pool from freezing. Once it is frozen, drill the hole in time to prevent it from suffocating due to lack of oxygen.
Six, river crab
The general requirement is to meet the commodity specifications in the current year. If the species cannot be reached because of the variety, it is necessary to consider wintering. In the winter season, use the earthen pond as the overwintering pool. The pool should have a mound higher than the water surface, with a water depth of 1.5m. Try not to make the pool water ice. The pool should be provided with water plants, and the pool should be covered with firewood to prevent the snow from flowing directly into the pool. The pool can also add some salt, so that it can increase the osmotic pressure of pool water, reduce the freezing point, and it can meet the certain salinity required by river crab physiological.
VII.
When the water temperature is low, in order to prevent freezing and damage the carcass, the water level should be deepened, or the plutonium should be lowered to the deep water layer, but the bottom of the pool should not be touched, and the water body should maintain a certain degree of fatness. In winter, it is necessary to break the ice on the surface of the water to prevent oxygen deficiency in the water body.
Eight bullfrogs
If spawning occurs in mid-July, control methods such as reduced feeding and deepening of water level can be used, so that the weight of untweeted young frogs can reach 15 g.èŒèšª Enter hibernating at a depth of 15cm below 60cm-100cm. If the water level is too shallow, thick ice will cause the bull frog to die. If it is a young frog, it should be enough to feed before winter. When the water temperature drops below 10 degrees, the young frog begins to hibernate. At this time, it is necessary to set a place suitable for the wintering of the bullfrog to allow the bullfrog to safely pass winter. Adult frogs can either enter the hole naturally or spend the winter on the underwater floor. Overwintering creatures and pay attention to changes in water quality.
Nine, é³–
When young calves generally have a weight of only 5g-15g before wintering, they must appropriately increase the feed containing higher fat content before stopping the diet. The hibernating pool can use the original indoor cultivation pool, first drain the pool water, add mud sand 30cm-40cm thick, add water 5cm-10cm deep, and the juvenile cocoon drills into the silt to hibernate. At this time, a layer of thickness 20cm-30cm is laid. Straw insulation, so that the pool temperature is maintained at 0-8 degrees. Cubs can be moved into winter indoors, and they can also naturally winter in outdoor sand on the bottom of the pool. Before winter, it should be filled with water to prevent it from freezing. In the event of natural wintering in the outdoors, Chengyu should be filled with water, and in the late summer and early autumn, it is necessary to strengthen the hibernation and safety wintering.
Wintering preparation and wintering management techniques for aquaculture species
In the late autumn and early winter, as the temperature dropped, various aquaculture species gradually changed from Wangshi to Shaoshi and stopped until they entered hibernation. When the water temperature drops to about 10 degrees, on the one hand, the aquaculture management must do a good job of listing and fishing products that have already reached the product specifications. On the other hand, we must grasp the winter preparations for the aquaculture products that do not meet the specifications of the commodities, and strengthen the management to ensure that Safe winter. The wintering preparation and overwintering management techniques for common aquaculture species are now described as follows: