How do field snails reproduce?
Snails are molluscs distributed in freshwater lakes, reservoirs, rice fields, ponds and ditches, and are often used as food, so how do snails reproduce?
I. the living habits of field snails
Field snails belong to the family Oncomelania and Oncomelania. They are cold-resistant and afraid of heat, and the most suitable growth temperature is 25 ℃.
Field snails have miscellaneous feeding habits. In the natural environment, they mainly eat aquatic plants, such as tender stems and leaves, algae, bacteria and organic detritus, as well as filter plankton, and like nocturnal activities and feeding.
Field snails are very sensitive to dissolved oxygen in water. When the amount of dissolved oxygen in water drops to 3.5 mg / L, they do not eat energetically; when 1.5 mg / L, they begin to die.
Second, how do field snails reproduce?
The field snail reproduces by mating and laying eggs. The mature eggs of the field snail meet with the sperm at the top of the fallopian tube and fertilize. The fertilized eggs undergo embryonic development in the womb of the female snail. After the development is completed, the offspring can be produced in batches, usually starting to reproduce from March to April each year.
Third, how to cultivate field snails
1. Seed selection
Live snails with light brown shell color, complete shell and no defects or trachoma should be selected.
2. Fertilization
Three to four days before restocking, an appropriate amount of mature organic fertilizer, such as chicken, duck, cow and pig manure, was put into the pond, which was beneficial to the growth of snails and the supply of food and bait.
3. Stocking
Snail species should be put into the pond as soon as possible after purchase. Snail species can be released when the air temperature is above 20 ℃ and the pond water temperature is above 15 ℃ before and after Ching Ming Festival every year.
4. Management
During the growth period, the water quality of the pond should be kept fresh and fed on time. The rapid growth cycle of field snail is 4 months, and the growth and development is the fastest and the yield is the highest from May to September every year.
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How does the tortoise spend the winter?
Turtles are reptiles of the family tortoise and tortoise genera, also known as golden turtles, grass turtles, mud turtles and mountain turtles, so how do turtles spend the winter? How does the tortoise spend the winter? The tortoise hibernates through the winter, and the temperature is usually below 15 ℃.
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How do tortoise seedlings survive the winter?
Turtle seedlings usually spend the winter by hibernating. Throughout the overwintering period, the tortoise's eyes are closed, head and tail limbs are retracted into the shell, do not eat motionless excretion, until the sting before moving position. So there is no need to feed or change water during hibernation.
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