Metapenaeus ensis is a promising species for desalination culture of seawater shrimp, which can be cultivated twice a year in southern China. At present, the yield per mu can reach more than 75 ~100 kg by artificial breeding in fresh water. The shrimp shell is thin and fat, and the meat is tender and delicious, which is better than that of China shrimp, and has strong adaptability. It can often be listed as live shrimp and is well received by domestic and foreign markets. The shrimp has strong vitality and a wide range of adaptive salinity. It can grow in 3% seawater or even fresh water, and the suitable water temperature range is17 ~ 32℃, and it can survive when the water temperature drops to 5 ~ 6℃ in winter. The shrimp is omnivorous, and its feeding habits are similar to those of common prawns in the stage of locomotion. The adult shrimp mainly preys on benthic ostracods, copepods and polychaetes, and also finds organic detritus and benthic diatoms. Because of its habit of diving to the bottom, it is better to use sand mud or sediment as the habitat substrate. ?

1. Selection of farms in metapenaeus ensis?

It is required that the pool should be built with sufficient water, good water quality, solid soil and convenient water intake and drainage. The specific requirements are as follows:

1. Site selection. Basically, the requirements are the same as those of fish ponds or the original freshwater fish ponds are used for aquaculture. ?

2. Shrimp pond area. 2 ~10 mu, water depth1.2 ~1.5 m, rectangle, bank slope1:2 ~1:2.5, and slightly inclined bottom for drainage. ?

3. Drainage system. The shrimp pond should have an independent water inlet and drainage channel to feed the shrimp row for irrigation. ?

Second, metapenaeus ensis's preparatory work before releasing seedlings?

1. Clear the pool. For the newly developed shrimp pond, water can be fed to nourish it as long as it is exposed to the sun for 2 ~ 3 days. For the old pond, it needs to be exposed to the sun for a winter, and the pond should be cleaned and disinfected strictly. Before seeding 15 days, strict drug disinfection (quicklime, bleaching powder) should be carried out. ?

2. Cultivate basic bait. 7 ~10 days before seedling release, the shrimp pond will store 50 cm of water, and then fertilizer will be applied to cultivate the basic biological bait in the shrimp pond. Fertilization types include organic fertilizer and inorganic fertilizer. ?

Three, metapenaeus ensis fry stocking?

Shrimp seedling desalination: The key to the success of desalination culture in metapenaeus ensis lies in the desalination of shrimp seedlings. Nursery manufacturers should gradually desalt the shrimp seedlings, and surprise desalination is strictly prohibited. Shrimp seedlings can only be directly moved into fresh water for culture after being diluted to the salt content specific gravity of 1.003. ?

Four, metapenaeus ensis aquaculture management?

After the shrimp fry enter the pond, it is the daily management work. During the breeding period, in addition to strengthening safety production measures, it mainly includes water quality management, feeding management and disease prevention.

Technical conditions of aquaculture in metapenaeus ensis

1, water temperature: metapenaeus ensis has a wide range of adaptation to water temperature, which is distributed at 8 ~ 29℃ in the sea area, and the appropriate water temperature for aquaculture is18 ~ 25℃.

2. Salinity: Penaeus metapenaeus ensis is a species of euryhaline, and its salinity can range from 0 to 34 ‰.

3. Food: metapenaeus ensis is omnivorous and partial to animals, mainly preying on benthic organisms, and eating benthic plankton and swimming organisms.

Six Points for Attention in Freshwater Culture in metapenaeus ensis

In autumn, the temperature difference between morning and evening gradually changes, thunderstorm weather or north wind is frequent, and algae in ponds are prone to stress death; At the same time, with the rapid decrease of the surface water temperature in the pond, the troposphere is formed, and the water with high dissolved oxygen content in the upper layer of the pond is transferred to the lower layer, and the lower layer of water rises, which promotes the rapid oxidation of reducing substances in the lower layer of water and consumes a lot of dissolved oxygen. In addition, algae die, photosynthesis is limited, and the dissolved oxygen mechanism is blocked, further aggravating the lack of dissolved oxygen in the pond.

At the same time, with the increase of food intake, shrimp excrements and residual bait are deposited on the bottom of the pond, and plankton in the pond water is over-multiplied, and the water body is seriously eutrophic. At this time, the consumption of dissolved oxygen in the shrimp pond is mainly due to the respiration of plankton and the decomposition of organic matter in the pond water.

A large amount of organic matter deposited at the bottom of the pond is oxidized and decomposed by bacteria, which consumes a lot of dissolved oxygen, which often makes the original dissolved oxygen in the lower water of the pond exhausted, resulting in the anoxic state of shrimp. The above two situations can easily lead to serious hypoxia in shrimp ponds and even a large number of deaths.

In view of the above problems, the management of Penaeus vannamei culture pond in autumn should focus on "stabilizing algae and supplementing oxygen, strengthening body and detoxifying, improving bottom and reducing fertilizer", flexibly feeding and scientifically preventing diseases.

1. Regularly add 10-20cm fresh water source into the pond, add a considerable amount of water bodies rich in dissolved oxygen in rivers, rivers and lakes after the fresh water source is strictly filtered, and install an aerator to aerate; Prepare enough oxygen-increasing agent for emergency use.

2. Put 1 time "Baile"+"Polyhedrin" every half month. In the morning, when the dissolved oxygen content in the shrimp pond is rich, the water is fully dissolved and then spilled all over the pond to prevent the water body from being too thick and algae from dying when the wind direction changes, so as to clarify the water quality and increase the transparency of the pond water.

Third, strengthen the physique of prawns, and take "stilbene" and "Saiwei" (a group of 300 kg materials) regularly to strengthen the resistance of prawns, increase the muscle compactness of prawns, and reduce the phenomenon that prawns do not disappear for a long time.

Four, in view of the algae death and toxic and harmful substances, every 10, splash "Baile"+"phloroglucin" to achieve the dual solution of water and organism toxins.

5. Use bottom cleaning every week to improve the dissolved oxygen environment at the bottom.

Six, flexible feeding adhere to frequent feeding, less feeding, do not feed when the dissolved oxygen is less than 4mg/L, feed more when the water quality is good, feed less when the water quality is bad, feed less or not when the north wind blows and the temperature drops, and feed less on the day when a large number of shrimps molt.

Are there any antibiotics in metapenaeus ensis?

Is metapenaeus ensis a sea shrimp or a river shrimp? What's the difference?