Penaeus vannamei is smaller than Penaeus vannamei and belongs to small and medium-sized shrimp. In terms of culture, Penaeus vannamei is one of the three highest-yielding prawns in the world (Penaeus vannamei, Penaeus monodon and Macrobrachium rosenbergii) and one of the three highest-yielding prawns. The output of Penaeus monodon is small, it is difficult to breed, and the market demand is not great. Therefore, it has no universal significance for the cultivation of Penaeus monodon. In nutrition, the nutrition of Penaeus monodon is higher than that of Penaeus vannamei.
Finally, tiger shrimp is Bohai shrimp.
Shrimp:
The distribution area is mainly in the Yellow Sea and Bohai Sea, with a small amount in the East China Sea and South China Sea.
In the past 30 years, scientific management measures have been taken, and the shrimp resources have remained relatively stable and good. However, supplementary overfishing also occurs from time to time, which affects the reduction of offspring and directly affects the decline of catch. According to the survey, there is a statistical correlation between the number of shrimp resources and the number of their parents in autumn flood season, and its confidence is not less than 5%.
Endangered level: rare
Arthropod, body length 15-20cm, thin and transparent shell. The whiskers on the second pair of antennae are very long. Meat is delicious and is one of the specialties of our country. Mainly produced in the Yellow Sea and Bohai Bay. It used to be sold in pairs in the market, so it was called prawn. Also known as prawns.
Penaeus monodon belongs to Penaeidae 1 genus. There are 28 species in the world, 7 species in Atlantic coast of America, 6 species in Pacific coast, 0/4 species in Indo-western Pacific, 0/species in Pacific and Mediterranean, and 0/species in West Africa. There are 10 species in China, which inhabit tropical and subtropical shallow seas. Prawn is a large individual, commonly known as prawn. Female growth individuals are generally 16 ~ 22 cm long and weigh about 50 ~ 80 g, with a maximum of 30 cm and a weight of 250 g. The male is small, with a body length of 13 ~ 18cm and a weight of 30 ~ 50g. North China is often sold in pairs, so it is called prawn. According to ecological habits, prawns can be divided into sedentary types (e.g. Penaeus japonicus, Penaeus kwangtungensis, Penaeus europaeus, etc. ) and migratory (such as China shrimp, Moji shrimp and Penaeus penicillatus). The former lives in shallow coastal waters, often diving into the sand bottom during the day and not moving around. The latter type lives in the muddy waters along the estuary and often moves and migrates on a large scale. Shrimp mainly feeds on benthic invertebrates, such as polychaetes, small crustaceans and bivalve mollusks, and sometimes catches zooplankton. Penaeus China is the most special species of the genus Penaeus in China, which is distributed in the marginal area of subtropical waters. It has strong adaptability to the environment and long-distance migration habits, and can survive below 65438 00℃ and above 30℃. The spawning ground is located in the low salinity sea near the estuary and along the coast.
Breeding and spawning in the Yellow Sea and Bohai Sea around May, fertilized eggs hatch into nauplii, oval, unsegmented, with only three pairs of appendages, which have nothing in common with adult shrimp. After molting six times, it becomes a flea-like larva. Molting for three times becomes a larva of mysid shrimp, molting for three times becomes a larva, and its morphological structure is similar to that of adults, with a body length of only 5 mm, swimming and floating, and sinking to the bottom of the sea after molting for several times. Young shrimps are usually concentrated in low-salt waters and intertidal zones in estuaries. They can live in estuaries and return to shallow seas after reaching 30 mm in length. Young shrimps grow rapidly, and they can grow and mate at the end of 10. The male puts the sperm pod into the female connector, and after about 5 months in winter, it is fertilized and developed during reproduction and spawning in May of the following year. Shrimp is a warm water species and can't adapt to low water temperature. After a long winter, they migrate to deeper waters in the southern part of the Yellow Sea, and a large number of groups gather in late autumn and then migrate, forming favorable fishing conditions and fishing seasons. The annual output of shrimp in the world is 300,000 ~ 400,000 tons, which plays an important role in marine fisheries. At present, shrimp culture in the world is developing rapidly, and the output of shrimp culture in China reached more than 80 thousand tons in 1986.