Technical points of cultivating Oncomelania hupensis

Fushou snail is a famous bottle snail, which looks like an apple, also known as apple snail. It is native to the Amazon River in South America and was introduced into Guangdong Province in the early 1980s. Oncomelania hupensis is a delicious delicacy on the table of families and restaurants. This paper introduces the main points of its culture.

1. The aquaculture site can build cement ponds indoors or culture in containers such as tanks, buckets, pots, etc. Outdoor breeding should choose places with rich water sources, wind shelter, no pollution, easy drainage and irrigation, and no enemies such as water rats, waterfowl, rice field eel and so on.

(2) the snail can grow when the spawning and hatching is more than 8 ℃, and the ability of growth and reproduction is very strong when it is 20 ℃ ~ 30 ℃. After hatching, the young snails were cultured for 3 ~ 4 months to lay eggs and reproduce. A female snail can lay eggs continuously for 2 years, and the eggs are laid in a dry place above the water surface. During spawning, bamboo branches high above the water surface with a diameter of about 3 cm can be put into the water, or moved into aquatic plants for female snails to lay eggs. The snail eggs were arranged into blocks, showing red at first, turning brown in 4 ~ 5 days, and hatching young snails in 8 ~ 12 days. Hatching is faster and hatching rate is higher when it is more than 30 ℃. Therefore, in addition to the natural hatching outdoors in summer, the egg blocks can be retrieved and hatched in the greenhouse in other seasons.

Third, the optimal depth of water for the growth of snails of different sizes is also different. In the water layer with a depth of 3 cm ~ 10 cm, it is suitable to raise young snails of 0.5 g ~ 1 g, 20 cm ~ 30 cm and 50 cm ~ 100 cm deep for large snails of more than 10 grams. Therefore, it should be divided into three levels of culture in production. Generally, the young snails can be raised in an indoor wooden basin for 10 ~ 15 days, and then transferred to the secondary pond, which can make use of rice fields or build another cement pool with a depth of 60 cm ~ 80 cm. Move into a third-class pool that maintains a suitable water depth.

4. Feeding density: 4000 ~ 6000 young snails per square meter of water surface in the first-class pond (wooden basin), about 200 small snails per square meter in the second-class pond, and 20 large snails per square meter in the third-class pond, such as water depth of more than 1 meter. 40 snails per square meter.

Fifth, the main food of bait Fushou snail is fresh green vegetables, aquatic plants, pingles and other plants, but snails of different ages should have different choices: red duckweed and tender green vegetable leaves are the main food for young snails of less than 10 grams, and some fine fodder such as fine rice bran are added appropriately; snails of more than 10 grams can be fed with vegetable leaves, water plants, melon peel and so on. Input to snail feed can be eaten as the degree, strictly prevent excessive investment at one time, resulting in decay and affect the water quality. The bait should not be fed at a fixed point, but should be dispersed so that the feed is evenly distributed in the water, usually once in the morning and once in the evening.

6. Water quality Fushou snail has a large amount of food and feces, so it is easy to pollute the water quality, so it should be changed every 3 ~ 5 days, or raised by running water to keep the water fresh. In addition, it is also necessary to strictly prevent pesticides, oil and lime from polluting the pool water.