Earth pond crab breeding method

First, the soil crab crab nursery soil pond crab breeding refers to the coastal area, the use of natural seawater in the excavated ponds, artificial cultivation method of crab larvae. This method is low cost, simple and practical, suitable for professional crab farming households.
In addition to the cultivation ponds, the earth pond breeding crabs should also have facilities for pro-crab ponds, production-promoting pools, bait ponds, and seawater sedimentation tanks.
There is a wide range of applications for earth crab crab breeding. As long as the salinity is more than 0.013 in the unpolluted seawater area, it is possible to build a pond nursery. Its nursery conditions are closer to the natural ecology. Generally, the breeding of crabs in the earthen pond is in the wild. It is necessary to prevent the cold water from invading and causing the water temperature to drop. Conditions can be used to keep warm facilities. Or the time for raising seedlings will be delayed. If the water temperature is relatively stable, the survival rate of seedlings can also be greatly improved.

Second, the pool structure requires pool shape should be square, area of ​​0.5 to 1 mus, water depth of 1.5 meters, due to larvae like clusters, hi wind countercurrent, hi corners and other habits, so most of the nursery pool concentrated in the upper hand of the pool One end. If the area of ​​the pool is too large, most of the seedlings will be concentrated together, which will easily lead to excessive dense crab seedlings in the local area, causing lack of baits, lack of oxygen and a large number of deaths. The bottom of the pool is preferably made of sandy soil. The surrounding area of ​​the pool is made of block stone (or cement prefabricated panel) mortar to form a stone wall (or cement wall), so that the larvae will not dry up when the water level changes. One end of the tank is equipped with a water valve. The other end is equipped with a flared bottom hole outlet. The horn water outlet hole is blocked with GG54 nylon sieve or polyethylene cloth to prevent the larvae from escaping when the pool water is drained.

Third, the clear pond and disinfected clear ponds and disinfection are generally carried out 10 to 15 days before larval rearing, killing the enemy's harmful organisms (fish, shrimp, aquatic insects, etc.) 0, excluding sewage from the pool, removing sludge from the pond, and washing the pool wall. Maintenance drainage pipes, etc. Qingchi drugs are lime, bleach, formalin, malachite green and so on.
(1) Quicklime: When using, drain the pool water to 10-20cm and evenly put in quicklime. Quanchiposa is used. The amount per mu is 75-100kg, which is suitable for 7-10 days after clearing.
(2) Bleaching powder: Since the bleaching powder is very volatile and decomposable in the air, the bleaching powder should be immediately poured into a wooden barrel, mixed with water, and then mixed into a paste, and then diluted with water. If the pool is dry, the dosage is 6-10 kg per mu. With water clear pond, apply 100 grams per cubic meter of water. Bleached clear ponds were conducted 4 to 6 days before larvae hatched.
(3) Formalin: Good effect on killing viruses and protozoa in the pool. In the case of dry ponds, the amount of formalin per acre is 6 to 10 kg. Quanchiposa has a killing effect on polyptera and the application is carried out 10 days before larval rearing.
(4) Malachite Green: Water clear ponds, so that the concentration of malachite green solution in the pool water of 0.25 ~ 0.4ppm, for the killing of seawater to listen to zooplankton such as copepod has a significant effect, in the nursery before half a month application.
(5) Trichlorfon: It is a broad-spectrum organophosphorus insecticide. Dichlorvos have a strong stomach poisoning and killing effect on insects. Destroying the clavicles in the water at a concentration of 0.25 ppm has a significant effect. Half a month before growing seedlings.

IV. Water intake and fertilization Water for nursery and nursery shall be filtered with a sieve and then sterilized with 50 to 100 ppm of bleaching powder, and then precipitated twice a day for 7 days. Water shall be filtered through 120 mesh and 80 mesh sieves to enter the pool. Then fertilize once a day, the amount of fertilizer is potassium nitrate 5ppm, potassium dihydrogen phosphate 0.5ppm. After the water is light brown, potassium nitrate 2 ppm and potassium dihydrogen phosphate 0.2-0.3 ppm are applied every day. If the content of copper, zinc, etc. in the water exceeds the water quality standard, 3 ppm of EDTA should be added.

V. Feeding In the 4 to 5 days prior to the hatching of the crab larvae, 1–1.5 kg of calcium nitrate is applied per acre, and the previously cultivated unicellular algal fluid is inoculated into the pool. Once larvae hatch, they can feed on single-celled algae. In case of cloudy days, algae breeding is not good, and 1 to 1.5 kg of cooked soybean milk per acre can be used to spray fertilizer. To be fierce from the nourishment? 氲冖蚱谑 ? ? ? ? ? 保 保 保 ? 孤 孤 婕 婕 崮瓿嫘⌒ 崮瓿嫘⌒ 崮瓿嫘⌒ 崮瓿嫘⌒ 藿谟 藿谟 藿谟 藿谟 藿谟 藿谟 藿谟 藿谟 藿谟 藿谟 藿谟 藿谟 场 场 场 场 凶 凶崮瓿嫖藿谟 崮瓿嫖藿谟 澹 澹 澹 澹 蛊涿芏 蛊涿芏 蛊涿芏 蛊涿芏 蛊涿芏 迕芏鹊 迕芏鹊 迕芏鹊 迕芏鹊 迕芏鹊 迕芏鹊 迕芏鹊 迕芏鹊 迕芏鹊 迕芏鹊 迕芏鹊 迕芏鹊 以上 , , , , 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。.

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