Prawn Penaeus monodon, commonly known as grass shrimp, has a long history of breeding in China and is one of the world's three most productive shrimps. It is a tropical and subtropical economic shrimp that is mainly farmed in Guangdong, Fujian, Zhejiang, and Hainan. The shrimp has the advantages of fast growth, strong adaptability, miscellaneous food habits, large individuals, resistance to dry dew, and easy transportation, and is a rare shrimp that is popular among farmers and consumers. Its nutritional value is similar to that of other major shrimps. Now briefly introduce its seedling technology:
There are usually two sources of broodstock used for broodstock breeding: one is to catch mature broodstock from the larval spawning field, and the second is artificially grown shrimp. The broodstock should be selectively plump, physically robust, and ovaries brown or brownish green. The proportion of males and females is best maintained at 3-4:1. Can use live water and inflatable canvas bags to transport. Broilers that have just arrived at the hatchery must be sterilized before they can be stocked in broodstock ponds. Disinfection typically uses 200-500 ppm of formalin or 0.5-1.0 ppm of malachite green. The temperature of the broodstock pool is preferably maintained at 27-28°C, and the density of the broodstock pool is 3-5 fishes per square metre, and the water quality conditions can be as good as 10-20 tails per square meter.
After the body of the broodstock is recovered, the temperature is raised to 28-29°C and the salinity is maintained at 25‰-32 ?. Temperature and salinity are required to be relatively stable during cultivation. Feed some fresh, nutritious foods every day, such as squid, clams, squid, shrimp, and crab. The daily feeding amount is 15% - 25% of the shrimp body weight. Drain the sewage once a day and pay attention to maintaining the water quality.
Artificial ripening Whether the wild shrimp is harvested or the bred shrimp is used as a broodstock, it must be matured before spawning. The commonly used and effective and simple method is to remove the unilateral eyelid method. The unilateral eyelid was removed with a blanching method to induce gonad development and maturation and early egg laying.
After the operation, the broodstock will be affected to some extent, and the physique is weak. It should be observed continuously and the broodstock should be laid on its side. It is necessary to use a tool to raise it in time to prevent death. Once the female oysters have shelled, move them into the male cultivating pool in time. At this time, the light should be weak, try to create a suitable mating environment and prompt the broodstocks to mate, spawn and fertilize themselves. Under artificial conditions, the natural fertilization rate of broodstock is very low, so commonly used methods such as transplantation of spermatophores and vas deferens are used for artificial insemination to increase the fertility rate of broodstock and increase the utilization rate of broodstock.
Timely Spawning The broodstock is examined for ovary development every day after 2-3 days of ripening. The broodstock with the ovaries projecting on both sides of the first and second abdomen sections and having a triangular shade was removed with a dip net and transferred to a spawning pool. The broodstock should be soaked in 200-300 ppm formalin for 30 minutes prior to moving into the spawning tank for disinfection and sterilization purposes. Broodstock spawning generally spawns around midnight, and the water temperature is controlled at about 30°C during spawning. The broodstock is removed the next morning, and the larvae usually hatch after 12 hours. In order to prevent broodstock disease from being brought into the nursery pool, after the larvae are hatched, the larvae are generally moved into the nursery pool and the dead eggs are left in the spawning pool.
The larval rearing stocking density is preferably 100,000 to 150,000/m3. The temperature of the cultivation pond water is controlled at about 30°C, the salinity is 25‰-32‰, the pH value is 7.5-8.5, and the dissolved oxygen is not less than 6.0 mg/kg. Rise. The larval nodules of Penaeus monodon don't feed, they rely on their own yolk to enter the pods and start to feed on tiny animals and plants. When they reach the end of the prawn season, their feeding capacity is enhanced. After the larvae, artificial diets such as quail meat can be taken. Common types of bait are:
1. Skeletonema algae, Chaetoceros muelleri, Nitzschia closterium, Phaeodactylum tricornutum, Chlorella, Salina sp.
2. Brachionus plicatilis, Artemia, bivalve eggs and larvae.
3, tofu, soy flour, egg yolk, egg tarts, shrimp, artificial feed. Regularly measure water quality, strictly control ammonia nitrogen below 0.5 mg/l, pH value between 7.5-8.5. The water level is controlled at 65-100 cm. Nursery pool is placed on a square meter of an inflatable stone. The nauplii were aerated in the form of microwaves, and the braided larvae were inflated in a slightly-boiling manner. The larvae of the shrimps were inflated in a slight boiling manner. The larvae were aerated in a boiling manner (see below for the structure of the larval rearing tank). When the juveniles enter the black muscle period from the red-band period, the body is 1.0-1.2 centimeters long and can be sprouted.
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