How many soft-shelled turtle fry are there?

This needs to look at the size of the turtle seedlings, if it is a little larger turtle seedlings, two catties, then there are about 4-5, if it is a smaller turtle seedlings, two catties, then there are about 10-15, specifically according to the size of the A fry to determine the number of two catties.

I. How much is the cost profit of raising 3000 soft-shelled turtles?

1. 300-400 soft-shelled turtles can be raised on 1 mu of water surface. After two years of breeding, 600-800 jin commercial soft-shelled turtles can be produced in one mu of fish pond. Turtle needs 5 catties of yellow mealworm or maggot for each catty. If it is raised by itself, the cost of 5 catties of yellow mealworm or maggot is about 6-8 yuan. According to 7 yuan, the cost of raising a turtle of 2 catties is about 15 yuan.

2. At present, the market price of A fry is 10 yuan/fish (if it is self-breeding, the cost of each fish is less than 1 yuan), the lowest market price of soft-shelled turtle is 60 yuan/catty, and the net profit of a soft-shelled turtle weighing two catties is: 2 jin ×60 yuan/catty-15 yuan (feeding cost)-10 yuan =95 yuan.

3. Raising 3000 soft-shelled turtles on 10 mu can earn a net profit of 280,000 yuan. The annual net profit is about 140,000 yuan. Turtle pond and fish pond are the same, the cost of building a pond varies from place to place, and one mu of cement pool is about 3000 yuan (available for decades). The construction cost of 10 mu turtle pond is about 30,000 yuan. The cost of raising 3000 soft-shelled turtle seedlings in 10 mu fish pond is 30000 yuan. The total investment in the first year of raising 10 mu of soft-shelled turtle is about 60,000 yuan (30000 yuan +3000 soft-shelled turtle in 10 mu fish pond). Tenebrio molitor and maggots because they are raised by themselves, nor one-time investment, can not be considered, the early investment of 60,000 yuan can be.