To prevent crabs from falling in the fall
Autumn is the season of crab maturation and harvest, and it is also the peak period of crab death. Therefore, strengthening the management of crab farming in autumn is the key to preventing the autumn death of crabs and improving the efficiency of crab breeding.
To prevent natural death, the old saying goes: “Since the West Wind, crab legs itch.†From September to November of each year, there are a group of crabs that have been growing for 2 years. The yellow crabs have been shelled and become green crabs. The gonads mature and enter the final stage of their lives. All the crabs that itch their feet have to escape because they are already mature and their osmotic pressure rises. They cannot adapt to the freshwater, low osmotic pressure environment and cause most crabs to die naturally. Therefore, these crabs should be caught and sold in time.
To prevent the death of colds During the autumn, the temperature varies greatly during the day and night, and the water temperature also varies greatly. Sometimes it can reach as high as 10°C. The crabs die due to their inability to adapt to this environmental condition. Therefore it must be prevented. Prevention methods: First, usually pay attention to regulate the water level, control the rapid changes in water temperature, the temperature difference between the injected new water and the old water should not be greater than 3 °C. Second, the water should retain more water hyacinth, water peanuts and other coverings, but not more than 1/2 of the surface. Third, when the weather changes, it is necessary to deepen the water level.
Prevention of indigestion Death In the autumn, due to the drastic changes in air pressure and water temperature, the crabs have changed their dietary habits and are likely to cause indigestion of crabs. In severe cases, they even cause the death of all crabs. Therefore, we must carefully control, methods: First, improve water quality, regular disinfection with lime water. Second, in the feed regularly add antibiotics and auxin. Third, do not feed or feed less vegetable feed, feed animal feed, especially barley, snail and other high protein feed. Fourth, the feeding should be quantified regularly, when the water temperature drops, it is necessary to reduce the amount of feeding.
Straightening Brush,Hair Straightener Brush,Best Hair Straightening Brush,Hair Straightener Brush Price
Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.szmeizons.com