I. Living habits Turtles are omnivorous animals that feed on small fish, shrimp, worms, snails, and fruits, young leaves, and stems of plants. Artificial turtles use artificial compound feed and are resistant to extensive culture in Guangdong and other regions. In the middle and late of the month, when the water temperature reached 18°C, it began to feed. From May to October, it was a food-rich period. In November, the food intake began to decline.
Second, the age and growth Turtle optimum growth temperature is 25 °C ~ 30 °C, the water temperature below 20 °C when the growth stopped, below 15 °C, then enter the hibernation state. Under normal conventional culture conditions, the first-instar young turtles weighed about 40 grams on average; the 2-year-old females weighed 178 grams, the males weighed 198 grams; the 3rd-instar females had 368 grams; the males had 138 grams; and the 4-year-old females had 687 weights. Grams, males weigh 175 grams. From the stage of growth from young turtles to adult turtles, from the second instar, the growth rate was faster, male turtles grew slower than females, and the individuals were smaller. Artificial temperature-controlled culture was adopted to control the water temperature in the winter cold season at 25°C to 30°C to break the hibernation pattern. The weight of the 2-year-old female turtles can reach 350-400 g and the males can weigh 150-175 g.
III. Breeding habits In the artificially cultured conditions in South China, the number of male turtles reached about 200 grams in the fourth year and 400 grams in females. The gonads have matured, and very few spawned in mid-February, most of them in the middle or late April. Began spawning until August. The 4th-instar turtle began to lay eggs and produced an average of 5 litters. The 5th instar produced 3 litters, 6 eggs produced 22 eggs, and 7 eggs produced 28 eggs. General 4th to 5th instar turtles produce eggs weighing 4 grams to 5 grams, 5 instars up to 5 grams to 11 grams. In the aquaculture production practice, the male and female of the turtle is better than 2 to 2.5:1 in general, which can not only satisfy the requirements of the progeny but also improve the breeding yield.
Artificial hatching of turtle fertilized eggs is generally carried out in the nest, and hatching with wooden boxes is better. Put the wooden box into the sediment after drilling, ovulate one layer to two layers, and then cover with 2 cm to 3 cm thick silt to keep the temperature of the sediment at 24°C～34°C. After incubation for 60 days to 65 days, Out of shell. Normal 4th to 5th instar hatchling hatch hatch hatchlings with a body weight of 2.5 g to 4 g. After the 5th instar hatchling hatches hatchling hatchlings with a body weight of 4 g to 8 g, hatching rate of fertilized eggs It reaches 90%. Therefore, as the age of the turtle increases and the individuals increase, its reproductive performance gradually increases.
Fourth, high economic value, good breeding prospects In recent years, due to the large number of pesticide use and artificial over-fishing and other factors, the turtle's natural resources have decreased significantly, but with the sharp increase in social demand, its economic value is getting higher and higher. Therefore, the contradiction between supply and demand in the market is very prominent. In order to make up for its lack of natural resources and meet market demand, turtle production from the early 90s of the last century less than 500 tons, has increased to 10,000 tons by the end of 2002, the commodity price is between 150 yuan / kg to 180 yuan / kg. In particular, with the introduction of a non-environmental pollution policy advocated by the government, coupled with its resistance to extensive breeding and strong resistance to disease, the turtle has a good prospect for pollution-free, large-scale and industrialized breeding of turtles.
Vitamins
Food additive Herbicide Co., Ltd. , http://www.chherbicide.com