Outdoor earth pond ecological culturing of portunid juvenile crabs
An ecological technology for swimming crabs three warts, applied in fish farming, application, climate change adaptation and other directions, can solve the problems of difficulty in adapting to the natural environment, low survival rate of breeding, etc., and achieves significant economic benefits, high survival rate, and broad development. Foreground effect
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Embodiment 1
[0007] Process technology and key technology: the outdoor earthen pond ecological breeding of Portunus trituberculatus utilizes the existing original river crab ecological seedling pond (earth pond) or the newly-built seedling earthen pond for outdoor earthen pond ecological seedling cultivation, which is based on the climate characteristics of the northern region's seedling cultivation period and adopts early artificial maturation The method solves the problem of climate constraints in the process of industrialized seedling raising in the south and the northward transfer of breeding technology. The main difference between the ecological seedling raising method and the industrial seedling raising method is that the key technology of ecological seedling raising is to imitate the natural ecological environment of the ocean to hatch; artificially manufacture attachments, increase shelling and concealment conditions, reduce mutual killing of crab seedlings, and improve the survival ...
Embodiment 2
[0009] Breeding crab cultivation: Generally, the parent crabs are purchased in March of the year, and the parent crabs are placed in the nursery room to raise the temperature to 12-18 degrees in late March, and the sunlight is controlled below 5ix. For fresh bait such as minced fish, the feeding amount is 10% of the parent crab's weight, and the stocking density of the parent crab is 3-5 / m2. Carry out low temperature pre-production to achieve the purpose of early production and emergence.
Embodiment 3
[0011] Crab seedling hatching (oxygenated hatching and larvae cultivation): When the parent crab embryo develops to the original zoea-like larvae, purple spots appear at the base of the frontal horn, and when the outdoor water temperature naturally rises to 15-18, move the parent crab to be born indoors out of the outdoor hanging cage Oviposition is carried out to induce spawning and hatch young. Generally, there are 10 parent crabs per square meter of net cages, and the selected ones that develop synchronously are loaded into a cage for natural rowing. The discharge density of larvae is 30,000 per cubic meter of water body. At the same time, larvae are cultivated and live rotifers are put in. With the increase of larvae density and food intake, the feeding amount of rotifers is continuously increased. If the supply of live rotifers is insufficient, copepods, artemia nauplii or minced fish and shrimp can be supplemented. The whole seedling raising process is a one-time injecti...
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