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First, develop a technology breeding base should choose non-polluting source of the sea, the proportion of seawater not less than 1.016 throughout the year, and often remain above 1.020, clear water, smooth flow, convenient water, wind and moisture conditions are good.
1. The size of the aquaculture facility growing pool is 6m 3m 1m. Both ends of the pool wall are provided with water inlet pipes and inflatable pipes. At the same time, two polyethylene ropes are pulled between the two ends of the wall of the pool to serve as fixed aeration. For the use of pipes, there are 9 to 12 inflatable pipes at the bottom of the pool, each of which is 1.5 to 2.0 meters long. The bottom of the pool is inclined toward the outlet. Bottom floor structure: At the bottom 20cm from the bottom of the pool, a layer of wooden planks is first made of wood strips of about 6cm in size, and then 80 to 100mesh sieves are used to spread on the planks. Then the sea is disinfected with potassium permanganate. Sand shop is 6-8 cm thick. The shade setting of the culture pond: Take the iron frame 3 meters above the ground and cover the shade net at the top. The surrounding area of ​​the breeding ground was covered with a shading net, and the high and the top were sewn together.
2. Seed stocking (1) Qingchi washing: Rinse aquaculture pond with high-pressure water gun, then disinfect with potassium permanganate, and then wash twice with seawater. After the natural seawater is filtered through a fine sand layer, the breeding pond is filled with 50 to 80 cm of water, and the specific gravity of seawater is required to be 1.018 to 1.022. The water temperature is 25 to 30°C and the pH value is 8.1 to 8.5.
(2) Feeding seedlings: Select seedlings self-bred from this base and require seedlings to be smooth, clear in shape, free of debris, soft and plump without shelling, small and neat size, and shell length of 0.6 to 1 cm. .
(3) Stocking Density: The production of the base adopts indoor and outdoor cement pool high-density micro-water aquaculture models, with 11,000 to 16,000 seed stocks per pond, with an average of 700 to 1,000 grains per square meter.
3. Cultivating management (1) The seedlings are put into a cement pool, and the seedlings are not adapted to the changes of the environment in the first few days. There is a phenomenon of climbing off the wall. When the temperature is high, the time is longer. Will die to death. Therefore, in the daily management, it is necessary to regularly patrol the pool, and timely put the screw that climbs the wall off the water back into the pool water so as to avoid unnecessary losses. On the second day after the seedlings are injected, small fish pieces are to be fed. The size of the fish pieces should be determined according to the individual size of the snails. The fish fed are mainly light fish, tilapia and small junk fish. The amount of feed is weight. From 7% to 10%, the amount of bait to be fed depends on factors such as weather changes, water temperature, and water quality. It is generally preferable to use a little surplus after 4 hours of feeding. The number of feedings is 1 or 2 times a day. If the number of feedings is 2 minutes in the morning and evening, fresh fish is fed every day at 8:00 am and 17:00 pm.
(2) To conduct micro-fluidized water planting, the amount of flowing water should reach 3 to 5 times of the aquaculture water per day. In the high temperature period should increase the amount of water, shorten the time for changing the water. In order to keep the water clean, we not only clean up the bait every morning, but also change the water once every 3 to 4 days and flush the bottom sand once, and change the sand once every 40 to 50 days. At the same time, the microbiological agent is continuously injected to ensure the pool water. Dissolved oxygen greater than 3 mg/l, pH 7.5-8.5.
4. Disease prevention and control Regular use of photosynthetic bacteria, regular sand change for sand, timely removal of residual baits: once every two weeks to vote antibiotics, alternate use of norfloxacin 0.55 mg / liter, virus Ling 0.55 mg / l, banyan 0.3 Mg/l, etc.
5. Harvest After about 5 months of culture, the seedlings of E. orientalis are grown from shells of 0.6 to 1 cm in length and can be marketed when they are grown to specifications of 120 to 200/kg. According to the needs of the market, capture can be used to capture large and small, so that Dongfeng Lo has not yet reached the market specifications continue to breed. The current market price is good, the purchase price is about 68 yuan per 500 grams.
II. Output and economic efficiency Each bank will be stocked with 15,000 seedlings, 110 kg will be harvested, and the number of grains will be approximately 14400. The survival rate will be 96.0% and the output value will be 14,960 yuan. Deduction of farming costs 70 yuan / kg, net profit of 7260 yuan, net profit of 403 yuan per square meter.
Third, summary and discussion
1. Dongfengluo has the characteristics of rapid growth, high yield, wide adaptability, and easy to grow, and can be used for indoor and outdoor cement pools for high-density water aquaculture, sea aquaculture, high-level pond aquaculture, and common sand-bottom shrimp pond culture. In addition, the climate in our province is suitable, and it can be cultivated for two years. It is quite promising to promote the breeding of Dongfengluo.
2. In recent years, South American white prawn breeding has many diseases and risks. Especially in the first half of 2005, due to frequent diseases, the drainage rate was as high as 70% to 80%. In order to make the breeding industry sustainable, this year our province has quite Some shrimp farmers and shrimp nursery bases have been transferred to Dongfeng Locust seedlings and culture. At present, the large-scale seedling production and cultivation techniques have basically matured. The development of Dongfenghulan aquaculture can be used as a driving project for fishermen in the coastal areas of our province to make a fortune, and fishermen to change production and change jobs.
3. Dongfengluo hi habitat sand layer, sand layer can not only provide a quiet and quiet living environment, but also can play a role in purifying water quality. Regarding the thickness of the sand layer, we think it should be possible to cover the screw height. The sand layer is too thick and unfavorable for cleaning. It will increase the burden and cost of sand washing. It is too shallow to grow. The thickness of the sand layer in the aquaculture production operation should increase with the growth needs of snails.
4. Experiments show that Dongfengluo is selective for bait, especially for crab meat, tilapia, shrimp, light fish, and small trash fish. From the perspective of eating habits, the source of feed and the cost, it is more suitable for the development direction of our province to feed tilapia and small miscellaneous fish on the premise of failing to solve the artificial compound feed.
5. There is a problem. Although one species of Dongfengspira species can be produced on a large scale, the high price of the species is a bottleneck restricting its expansion. The second is feeding the feed of Dongfengluo mainly based on small miscellaneous fish, but due to the limited supply of local small-sized miscellaneous fish, the price of small miscellaneous fish entering Hainan is relatively expensive, and the quality is difficult to guarantee, which restricts the development of Dongfenghu breeding industry in our province. . To further promote farming, research on artificial compound feed must be strengthened. If it is possible to reduce the cost of seedlings and solve feed problems, Dongfenghu breeding will become another new bright spot in the coastal areas of our province.
Dongfenglu plant breeding technology
Dongfeng snail scientific name is Dongfeng snails, which is also known as small wind snail, sea snail, and snail. Is a gastropod, new gastropod, moth family. Fish, shrimp, shellfish for food, suitable for sandy or sandy mud, stone seams and other growth. Usually lurking in the sand layer, crawling out of the sand when feeding. Due to its large food intake, rapid growth, wide adaptation, and strong disease resistance, the high survival rate is very suitable for aquaculture in the coastal areas of Hainan Province. Now introduce the factory farming technology as follows: