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First, it can reduce the surface wear or death caused by the landing of the sea otters;
When the second storm is large and the light is too strong, the jellyfish have to dive, and the greater the individual's dive is, the deeper the dive is. If the water is shallow, the jellyfish will forcibly submerge, causing the jellyfish body to wear out.
The third water level deepens, the water temperature in the bottom of the pond is relatively stable, the sea otters can avoid the sudden temperature drop in spring and the high temperature in summer, and the deeper the pond is, the bigger the sea otters grow.
Therefore, the high standard of culture ponds is the most basic condition for stable production and high yield of sea bream and shrimp.
Second, the appropriate time for seedlings and a reasonable rate of seedlings. Polyculture of sea bream and shrimp. The following two factors must be considered before releasing seedlings. First, the water quality index of the rearing pool must be the same as the water quality index of seedling larvae and larvae in the nursery room or Proximity; Second, shrimp reared on a 3 cm long seedlings can be reared for sea lice, because sea lice can feed on shrimps less than 3 cm. The best time to lay seedlings in western Liaoning is in mid-May, and the time for sea larvae to hatch is appropriate in mid-June. The time for planting seedlings in Jiangsu and Zhejiang can be appropriately advanced.
According to the experience of breeding in the region for several years, the specifications of shrimps in the polyculture of sea bream and shrimp are required to be 1 cm or more, the seedling density is 8000 to 10,000 tails/mu, and the sea lice seedlings are raised to 4 cm or more, and the density is 100 to 200. /mu.
Third, the middle of the jellyfish seedlings from the nursery plant purchased from the nursery plant umbrella diameter mostly 1 cm or more, the individual is small, the direct stocking effect is not ideal, it is recommended that the seedlings for intermediate holdings. The purpose of holding is to raise the survival rate, and secondly, to speed up the growth of the young. The holding methods include cement pool holding, cage holding and earth holding, etc. It is more economical and practical to hold the fence directly in the rearing pond and hold 200 to 300 densities per meter, when the seedling grows to 4 At ~5 cm, the fence was removed for breeding.
Fourth, bait feeding Early breeding pool bait creatures are more abundant, so basically no bait after the shrimp is put, until the shrimp grow to 3 to 5 centimeters, according to the amount of food organisms in the pool and shrimp gastrointestinal full complement of investment Feeding with bait, the feeding amount was adjusted according to shrimp seedlings specifications, reservoir volume, and weather conditions.
There are many kinds of bait, mainly clams such as cocklepods, cladocera, and amphipoda in the water, and their food intake is large. In the early stage, due to the small individuals, the input of bait and the feed organisms in the fertility tank can meet the demand of the sea bream, but in the middle and late period, with the increase of the individual sea otters, feeding is very necessary. There are three sources of bait:
First, feed organisms in the breeding ponds through fertilizers;
The second is the feeding of live food: such as Artemia larvae, copepods, branches, etc.;
The third method is to feed the grits in the case where the density of the sea bream is large, but this method must be followed along the pond to feed the sea bream and follow the principle of less work.
Fifth, water quality management, shrimp polyculture in the early stage to add water, each time add water 10% ∽ 15%. Later, as the individual's growth gradually increase the amount of water, the principle of changing the water must be changed little, change frequently, and try to avoid large-scale irrigation, in order to maintain a good growth environment for cockroaches and shrimp. During the whole culture period, the water salinity was kept between 18∽28, the pH was 7.5∽8.5, and the transparency was controlled at 30∽50cm. In addition, changes in water quality in the natural sea area must be mastered before each change of water, and changes in water quality such as red tides must be stopped.
VI. Clearing Algae in Aquaculture Ponds In recent years, the algae in the breeding ponds in our region have rapidly propagated, and it absorbs a lot of nutrients in the water, which causes the water in the aquaculture ponds to become thinner, which restricts the propagation and growth of other food organisms, and the proliferation of vines and vines. The increase in the transparency of pool water seriously affects the survival and growth of sea bream and shrimp.
Problems that Should Be Paid Attention to in the Polyculture of Jellyfish and Prawns
First, the basic conditions of the pond Begonia and prawns mixed suitable salinity range of 18 to 28, in this range, the lower the salinity grows better. Therefore, it is best to choose non-polluting aquaculture ponds with low salinity and freshwater injection. The aquaculture area of ​​50 to 100 mu is more appropriate, the water depth is 1.5 to 2 meters, and the steeper the shore slope is, the better the pond is set around the 0.5 meters from the bank to clear the surrounding debris of the pond. The benefits of the high standard pond are as follows: