Ma Yuehui, villager of Heping Village, Qiqiao Town, Gaochun County, Nanjing City, male, 43 years old, junior high school culture, contracting 40 mu of crabs, in Chaoyang Bridge, Qiqiao (west of Gaoxuan Highway), belongs to semi-mountain area, soil conditions, water conditions Not as good as the paddy field. This year, Ma Yuehui raises crabs in the sixth year. The efficiency in the previous four years was very poor and even lost money. The efficiency in the past two years has steadily increased. In 2008, the average profit per mu reached 3,568.75 yuan. Through investigations and summaries, I believe that he has three experiences and is worthy of learning from the crab-raising households in the Mid-Haute Mountains area.
First, pond transformation, application of new technologies.
1. Pond renovation. His crab pond runs from east to west. The difference between the east and the west is about 50cm. For the first four years, 40 acres of crab ponds are used as a pond. When the water is filled in the summer, there is only 50-60cm water depth on the east side of the paddy field, but it is more than 1 meter deep in the west, and production management is extremely inconvenient. . From the end of 2006 to the beginning of 2007, the pond was reconstructed for this situation. It was separated by two and 25 acres west of 15 acres. In this way, the water level of the two ponds can be effectively controlled, and water, water, and water quality can be adjusted as needed. Adjust it at any time.
2. Apply microporous oxygen technology. In early 2008, he summed up his 2007 experience and was the first to install microporous oxygen aeration equipment. In the past, in the summer hot season, the water quality was adjusted mainly by adding water and changing water, and the dissolved oxygen in the pond was maintained. However, the water quality of the pond was often poor and the effect was not achieved. This year, when the water quality is not good, there is no need to add water or change water, and the oxygen in the pond is kept high through the microporous oxygenation, which has achieved good results. Although the increase in investment of 16,000 yuan, but in 2008 than in 2007 increased by more than 1,000 yuan per mu.
Second, stocking quality seedlings
At the beginning of crab cultivation, in order to save costs, the stocked crabs are more complex and often have low survival rates and small specifications when harvested. In recent years, on the basis of conscientiously summarizing, he has obtained ideal results from the purchase of crab seedlings by a reputable and large-scale farmer. In 2008, his survival rate was generally low. The survival rate still reaches 65%, laying the foundation for obtaining high efficiency. The stocking of young shrimp and large-sized squid species is still purchased from a good reputation and good quality farm. This year, the average yield per mu of shrimp is more than 800 yuan, and the average profit per mu is more than 300 yuan.
Third, careful management
1. Pay attention to the early-stage fertilizer and water work. In the past two years, before the stocking of crabs, he paid attention to moderate fertilizer, which provided conditions for the crabs to adapt to the pond environment and early growth as soon as possible after entering the pond. Therefore, the first time there were few hull casualties.
2. Release snails and plant aquatic plants. The implementation of snails has changed the past practice and put them in stages. In the early stage, about 600 pounds per mu of mussels were released, accounting for 70%; and about 200 pounds per mu were sold in July-August, accounting for 30% of the mussels. In total, 800 mu pounds were placed per mu. This not only improves the utilization rate of snails, but also protects aquatic plants in summer and autumn.
The planting of aquatic plants has changed the practice of single species in the past. At present, Elodea, Vallisneria, Hydrilla verticillata are planted, and when the plants grow rich, the coverage rate of aquatic plants is about 70%.
Feed feed. This year, a total of 28,500 jins of small miscellaneous fish were fed, and the average grain yield was 712.5 pounds with a feed coefficient of 4.9; grain feed was 5,200 pounds, and the mu was 130 pounds, and the feed coefficient was 1.95; pumpkin was 1,000 pounds. The experience lies in: First, 80% of the small junk fish he feeds, and 20% of the small fresh fish purchased from Shijiu Lake are iced fish, which is of good quality. Second, the structure of alfalfa is relatively reasonable, the proportion of alfalfa is 1.63:1.
4. Strengthen water quality regulation to maintain high oxygen in ponds. He paid special attention to water quality regulation and dissolved oxygen in the pond. First of all, from May until the arrival of crabs, long-term or short-term microporous oxygenation was used depending on the weather conditions. Secondly, the use of microecological preparations to divert water, change the bottom and use less disinfection Drugs.
IV. Benefits
40 acres of crab pond, a total investment of 184,250 yuan, of which: pond rental fee 19,200 yuan, seed charge 28,510 yuan, feed costs 104,240 yuan, drug costs 7,300 yuan, utilities 1,500 yuan, staff wages 4,500 yuan, microporous oxygen equipment 16000 Yuan, a net with 3,000 yuan, a total income of 327,000 yuan, of which: crab income of 283,000 yuan, an average of 145 jin per mu, specifications 180 grams, the survival rate of 65%, 33,000 yuan of shrimp income, average per mu of 3567.75 yuan.
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