A Detailed Guide to River Snail Farming Techniques and Management Methods
The river snail is a traditional aquatic product of China. Its flesh is tender and delicious, rich in various nutrients, and deeply loved by people. Especially in recent years, as people's living standards have continued to rise, the market demand for river snails has also been increasing.
A Brief Discussion on River Snail Farming and Management
I. Living Habits The river snail is a gastropod mollusk; common species include the Chinese round river snail (Cipangopaludina chinensis) and the square ridged snail (Sinotaia quadrata). River snails like to live in waters that are warm in winter and cool in summer, with soft bottoms, abundant food, and clear, fresh water, and they especially like to gather in places with slight water flow. River snails are omnivorous, feeding on tender stems and leaves of aquatic plants, bacteria, and organic debris, and they prefer to be active and feed at night. River snails begin activity and feeding at a water temperature of about 15°C, and their optimum growth temperature is 20°C-27°C. Above 30°C they retract their flesh into the shell and stop feeding, gathering in shady places or burrowing into the mud to escape the heat. Above 40°C they die, and below 8°C they burrow into mud holes to hibernate, only emerging again to be active and feed the following spring when the water temperature rises back to about 15°C.
II. Reproductive Characteristics River snails are dioecious; generally the female snail is large and round, while the male snail is small and long. In appearance they are mainly distinguished by the tentacles on the head: the female snail's left and right tentacles are the same size and extend forward; the male snail's right tentacle is short and thick, with the tip curving inward to the right. There are more females than males, with females making up 75%-80% of the population. Breeding begins each April, with June-August being the peak birth season. River snails are ovoviviparous, and the embryonic development from fertilized egg to juvenile snail all takes place inside the female's body. The number of young produced is related to the age of the brood snail and environmental conditions, and generally each brood can produce 20-40 young.
III. Artificial Farming
1. Pond Construction Choose a place with abundant water sources, convenient management, and both flowing water and no pollution to build dedicated snail ponds. The pond width should be about 1.5 m. The pond length can be determined according to the terrain, generally 10 m-15 m. The pond depth should be 30 cm-50 cm. It is best to build several snail ponds in rows and in graded levels; water inlet and outlet openings are set at diagonally opposite ends of the pond, and anti-escape barriers are installed. Between two ponds, build a 20 cm high embankment for walking, and spread a 10 cm thick layer of fertile mud on the pond bottom. In the pond, wild rice stem, asparagus, or aquatic plants such as water hyacinth and duckweed can be sparsely planted or stocked, which both provides shade and heat relief for the river snails, climbing and resting surfaces, and food, creating a good ecological environment, and also improves the utilization rate of the snail pond and increases income. Around the snail pond, build a wall 60 cm-80 cm high or use netting as a fence.
2. Stocking and Management Generally, brood snails can be stocked one after another starting in late March. Brood snails can be purchased from markets or collected by oneself. Stock 100-120 brood snails per sq m, and 4 summer fry bighead carp can also be raised together in the pond. Before stocking the brood snails, first apply an appropriate amount of manure in the pond to cultivate food organisms. After stocking the snails, feed them vegetable leaves, rice bran, soybean cake, rapeseed cake, and scraps such as animal internal organs. Cake-type feeds should be soaked until soft before feeding, and other feeds should be chopped and mixed evenly before feeding. The feeding amount is generally calculated at 1%-3% of the total weight of the river snails, fed once every two to three days, and the feeding amount should be adjusted according to the growth and feeding conditions of the river snails. Feeding does not need to be at fixed locations, and more feeding points should be set up. When the water temperature is below 15°C or above 30°C, no feeding is needed.
River snails have few diseases, and the focus of daily management is managing water and preventing ducks, cats, snakes, rats, and birds from entering the pond to prey on the river snails, as well as frequently patrolling and inspecting to prevent the river snails from escaping. River snails are suitable for shallow-water, slight-flow farming, and the pond water depth should preferably be 25 cm-30 cm. During the breeding season and high-temperature periods, the pond water flow should be maintained even more. During hibernation, river snails burrow into mud holes, leaving only a small round hole on the mud surface to breathe; to maintain sufficient dissolved oxygen in the water, replace the pond water once every three to four days.
3. Harvesting When juvenile snails grow to more than 10 grams, their flesh is tender, fine, and plump, and they are most welcomed by the market, so they can be harvested in batches for sale. When harvesting, drain the pond water and collect them directly from the pond, taking care to retain about 60% of the larger individuals as brood snails.
Prospects for River Snail Farming
River snail meat is a nutrient-rich natural health food, and abroad it is also called a beauty food. It contains up to 10.3% protein and 1.2% fat, and also vitamins, calcium, iron, and other elements essential to the human body. The nutrition of river snail meat is superior to that of chicken, duck, goose, and pork, and is not inferior to crucian carp, sea cucumber, and others. River snail meat can nourish kidney yin, improve eyesight and clear the mind, enhance muscle elasticity, and make the skin delicate.
River snails can be used as an everyday meat dish, and can also be processed into a series of foods, made into various medicinal dishes, and used to prevent and treat diseases. At present, naturally grown river snails are far from meeting market demand, and river snail farming grows quickly and has high yield, so river snail farming has broad "money" prospects.
How to Select River Snails
When buying river snails, choose ones that are large in size, round in shape, and thin-shelled. The operculum of the river snail should be fully retracted, the shell should be pale bluish-green, with no flesh or juice overflowing, and the net weight of each should be relatively large. River snails are also divided into male and female. Because female river snails store nutrients in preparation for giving birth, their flesh is more delicious than that of male river snails. To select female river snails, observe their tentacles: the female's left and right tentacles are the same size and extend forward; the male's right tentacle is thick and short, with the tip curving inward to the right. When selecting, one should also pay attention to choosing live, fresh river snails. When selecting, you can gently press the operculum with your finger; if it is elastic, it is a live snail, otherwise it is a dead snail.
The most common way to cook river snails is stir-fried river snails with perilla leaves. This method is said to have first been discovered accidentally by a farmer named Li Xisu in Pantang, Guangzhou. As cooking methods have become more and more varied, the cooking of river snails is no longer limited to the "single flavor" of stir-fried river snails with perilla leaves.
Economic Benefits of River Snail Farming
1. Raising young snails brings benefits in the same year. After early rice transplanting, stock 60,000 river snail seedlings 7-15 days later, and by the time late rice is harvested they have reached sellable size. Calculating at a 90% survival rate, there are 54,000 in total, averaging 10 grams each, for a total of 540 kg. Under fully ecological farming, at a selling price of 6 yuan per kg, the total income is 3,240 yuan.
2. Rice output increases by 10% per 667 sq m, with an annual increase (two crops) of 160 kg, pesticide and fertilizer savings of 70%, and an increase in income and reduction in expenditure of 150 yuan per 667 sq m. Total income is 3,390 yuan. 2. Expenditure for the year: 973 yuan. Balancing income and expenditure, the profit is 2,417 yuan. In the first year, stock 1,100 large snails and keep them in fish ditches and fish pits for continued raising as brood snails for the second year. Self-breeding and self-raising can save on seedling costs and bring higher returns.
From the above analysis, we can see that river snail farming is actually a project with low investment cost and high return profit, so many people in rural areas choose to farm river snails. However, the editor needs to remind everyone that no farming venture is guaranteed to make money, and before farming one should still calmly analyze and think it through.