How to do well healthy aquaculture of aquatic fish
As the fishing proverb goes, "if you plant good seedlings, you will have high yields." When choosing and purchasing improved varieties, you should master the following points:
① inquired about the age and body weight of parent soft-shelled turtle from the seedling donor. Generally, more than 1 kg of 2-year-old soft-shelled turtle was the normal parent, and it was more ideal for 3-year-old 2-year-old soft-shelled turtle 3 kg.
The ② is neat in specification. About 10 grams of juvenile soft-shelled turtles should be used to raise soft-shelled turtles, and about 100 grams of commercial soft-shelled turtles should be used to raise soft-shelled turtles. The weight difference between individuals should not be too big, so as not to compete for food and bite each other and affect survival and growth.
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Common mistakes in the use of fish medicine
In aquaculture, losses are often caused by improper use of fish drugs. Agriculture and fisheries should pay attention to this. 1. The medication is not symptomatic. No matter what kind of fish disease occurs, some agriculture and fisheries use bleach, trichlorfon or copper sulfate to control it. Wrong medicine, not only can not play a role in the prevention and treatment of fish disease, sometimes it will be counterproductive. two。 The medicine is the same regardless of the size of the fish. When some farmers see the occurrence of fish boar disease, they sprinkle it with 2.5% trichlorfon in the whole pond, but they do not know it.
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Why do marine crabs die in large numbers during shelling?
The death of marine crabs in the shelling period shows that a large number of marine crabs die before shelling (failed shelling), and many marine crabs die after shelling (too much physical consumption after shelling, soft shell does not harden, etc.). The causes of death of marine crabs during the shelling period are as follows: (1) the water body is polluted and the dissolved oxygen is low, which affects the shelling and leads to death; (2) the nutrition of marine crabs is unbalanced (lack of calcium, phosphorus, magnesium, zinc, iron, vitamins, etc.). Weak); (3) the use of irritant drugs during the shelling period, there will be some death; (4)
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