Breeding technology-ZHONGKEHAI Recycling Water Aquaculture System(R.A.S)-第4页

Ecological and healthy breeding technology of Chinese mitten crab

4. Food habits: Chinese mitten crabs are omnivorous crustaceans. Their food habits have the characteristics of broad spectrum, cannibalism, gluttony and hunger resistance.
2. Salinity The salinity requirements of the first stage of flea-like larvae are higher than those of subsequent stages of flea-like larvae, and generally cannot be lower than 7‰; starting from the second stage of larvae, the salinity requirements decrease. Generally, the salinity can be reduced to about 5‰, and the metamorphosis can be smooth. The pool wall is preferably stone wall or cement board wall. When using quicklime to clean the pond, the dosage per acre of the dry pond is 75kg. On the one hand, it can kill harmful organisms. On the other hand, it can improve the water quality, increase the content of calcium ions in the water body, and promote the molting growth of Chinese mitten crabs. When using bleaching powder to clean the pond, first calculate the volume of the pond water, and use 20g of bleaching powder per cubic meter of water. Dissolve the bleaching powder required for the nursery pond with water, and then sprinkle it all over the pond immediately. Usually, crab seedlings can be released 5 days after the pond is cleaned. 3 to 5 days before planting seedlings, add new water to 60 to 80 centimeters, and then use Fertilizer and Water King/Fetilizer and Water Expert/Enoch Fishing Fertilizer/Bio Fertilizer Water Treasure + Water Treasure Nutrient/Freshwater Phytoauxin to fertilize and water. At the same time, you can use Black Elf/Water Adjuster/Nourish Water King/Enoch Bacteria King to adjust the water. 3. The desalination time of artificially bred crab fry must be five days, and the salinity should be less than three thousandths; the salinity of the water body at the natural crab fry fishing site should be less than five thousandths.
(1) From crab seedlings to young crab stages (weight increases from 6.5 mg to 2 grams, body length increases from 0.3 cm to 1.5 cm, molting eight times, lasting about 45 days), 100,000 to 200,000 crab seedlings can be released per mu.
① Plant-based feeds such as water peanuts, Hydrilla verticillata, Echinacea, Vallisneria and other natural aquatic plants, various vegetables such as pumpkins and watermelon rinds, and some cereal feeds;
2. Water quality management Chinese mitten crabs like to live in water bodies with fresh water, lush aquatic plants, sufficient dissolved oxygen, and abundant benthic organisms. The water temperature, dissolved oxygen, pH, sulfide nitrogen, ammonia nitrogen, plankton, and benthic organisms of the pool water are closely related to the habitat, growth and development of Chinese mitten crabs. (2) The pool water should be kept clear, fresh, and alive, with medium fertility, a transparency of about 30 to 50 centimeters, a dissolved oxygen requirement of more than 5 mg/L, and a pH value between 7.5 and 8.5; when water quality is abnormal, Enoch microbial preparations such as Tiao Shui Wang, Enoch Bacteria King, and Yujiabao should be used in a timely manner to improve the bottom quality and regulate the water quality.
(3) Be sure to keep the crab pond environment quiet and comfortable, and do not interfere too much with the feeding and molting processes of Chinese mitten crabs. Especially during the period when Chinese mitten crabs molt in large numbers, the crab pond environment must be kept quiet.

2014-03-07 admin 1459

Seawater specific gravity and salinity conversion table

2015-04-03 admin 38763

Breeding technology

Gadget

News Center

★Crab Apartment

Contact us