How shrimp grows, shrimp growth cycle

<> shrimp does not have a tail fin like a fish, but only a tail and many lower legs. Shrimp are expert swimmers and can swim long distances with their legs. When swimming, those swimmers paddled backwards like wooden paddles frequently and neatly, and their bodies were slowly driven.

When frightened, the abdomen flexes and stretches quickly, and the tail strokes downward and forward, and can jump backwards continuously, and the speed is very fast. Some shrimp are not good swimmers, and large lobsters crawl on the sand and rocks on the bottom of the sea most of the time.

Respiration and circulation The gills of the shrimp are located in the gill chamber formed on both sides of the dorsal carapace, and the anterior and posterior gill compartments and ventral surface communicate with the outside world. The gills are mostly pinnae, with a total of 25 pairs, and are born on the lateral wall of the thorax or the base of the thoracic limbs, and the epidermis is very thin, and the blood flow undergoes gas exchange when it passes through the gills. Inside the gill chambers, there are jaw-scapular pieces that constantly oscillate, allowing fresh water to enter from the back and ventral surface and flow forward.

The circulatory system is open-tube. The heart is a flattened, polygonal muscular sac, located in the pericardial sinus on the dorsal side of the cephalothorax, with 4 pairs of foramen, two pairs on the back, one pair on both sides of the posterior end, and the other pair on the ventral surface of the heart near the posterior end, with valves to control blood flow.

Transparent, slightly whitish are molted shells, and dead shrimp are pure white, white or red, but not transparent, as if they have been cooked.

<> shrimp is a suborder of the crustacean subphylum Decapodan sail swimming suborder, everyone is very familiar with the finch sedan sedan sedan void, and it is distributed and cultivated in various parts of China. How long is the long cycle of shrimp?

The growth cycle of shrimp is about 60-90 days, and the growth period of different shrimp species will be different in different environments. In the captive environment, the food is sufficient, the living space is ideal, the shrimp from the eggs to the shrimp seedlings need about 30 days, and it takes about 45 days to grow into adult shrimp. In the wild, food is scarce and the growth cycle is longer than that of farmed animals.

The growth cycle of shrimp is about 60-90 days.

100 pairs of shrimp with strong physique, no disease and no injury, specification of 20 50 grams, and male-to-female ratio of 1:1 were selected as broodstock, and the selected broodstock were raised in a cement pool of 6 8 l meters covered with FRP tiles and heating and heating system, and 10% of the shrimp body weight in the pond was fed with freshly cut "lobster" heads every day. Put some washed and disinfected mesh in the broodstock pond as a concealment for broodstock, suction and change water every day, keep 12 hours of light and 12 hours of darkness.

Growth environment: 1. Shrimp swimming is very different from fish, fish can swim forward by swinging its tail fin, while shrimp does not have a tail fin like fish, only a tail and many lower legs, so how does it swim lead? Shrimp also Huai Yuanheng has its "high tricks".

2. Shrimp is an expert swimmer and can swim long distances with its legs. When it swims, the swimming feet are like wooden paddles and frequently and neatly row backwards, and the body slowly moves. <>

It takes a month from spawning to seedlings, and it takes 45 days to grow to adult shrimp, about 80 foci leak a catty, and about 20 tails a catty in 90 days

The growth cycle of lobsters in the natural environment is 6 to 12 months, and the growth cycle of lobsters in captivity is generally 6 months. The suitable water temperature for the crayfish is 18 31, and the optimal water temperature is 22 31. The food eaten by the captive-bred dragon god shrimp contains hormones, which grow faster and mature earlier than the lobsters in the natural environment.

The growth and development of shrimp can be divided into fertilized eggs, nauplii larvae, potato flea-like larvae, mysis shrimp larvae, larvae, juvenile shrimp, and adult shrimp.

After the fertilized eggs hatch, they need to go through four stages: nauplii (stage 6), flea larvae (stage 3), mysis shrimp larvae (stage 3) and shrimp larvae, and each stage molts once, and a total of 12 times from the fertilized egg to the larvae. Auplii have no mouthparts, strong phototaxis, do not feed, rely on their own yolk to maintain life activities, and complete 6 molts in about 2 days to become flea-like larvae.

The body of the flea-like larvae begins to form a cuirasse, gives birth to 7 pairs of appendages, has a complete mouthpart and digestive organs, begins to feed, and develops into a mystic shrimp after 3 days and 3 stages. Mystic shrimp larvae develop into larvae in 3 days and begin to prey on small plankton. The body structure of juvenile shrimp and adult shrimp is almost the same, usually after P4 to P5, the average body length reaches about the beginning of ** shrimp seedlings.

Here's how to raise shrimp to feed them:

1. Aeration pumps can be installed in the breeding base to provide sufficient oxygen for shrimp in time.

2. Generally, the pH value of the aquaculture water needs to be kept between and not higher, and at the same time, it is necessary to inject new water frequently to keep the transparency of the pool water at about 30-40cm.

3. Quicklime solution can be regularly sprinkled to adjust water quality, disinfect, and prevent and control diseases and shelling.

4. There can be no large carnivorous fish in the pond, and aquatic plants must be abundant.

5. Disease management. Disease management should be based on prevention, and the quality of shrimp seedlings should be strictly controlled, and a strict quarantine system should be implemented; Do a good job in water quality management, and regularly sprinkle quicklime throughout the pool during each time period; Buy fresh, high-quality bait. If a disease occurs in the breeding process, it should be targeted according to the symptoms of the disease.

1. Hong Kong maintenance method.

Hong Kong culture is the traditional way of breeding in China, the breeding area ranges from more than ten hectares to hundreds of hectares, generally according to the natural topography of the intertidal zone of the sea area to build a dam enclosure, and the breeding equipment is simple.

In aquaculture, it generally relies on natural seedlings, and can also be put into industrial seedlings, but it does not fertilize or feed, and completely relies on natural productivity to provide products.

Its product categories include fish, crabs, shrimps, shellfish, etc., and the types of artificial seedlings put into the single species can also produce more than ten kilograms per mu, and the comprehensive (mu) benefits can reach hundreds of yuan.

Hong Kong culture is a breeding method that is worth advocating and developing. Especially in recent years, there has been a serious outbreak of shrimp disease and serious eutrophication in the coastal waters, which shows the great advantages of this method.

2. Semi-intensive farming.

It is developed on the basis of Hong Kong maintenance. That is, to build an ecological environment suitable for the survival and growth of shrimp, so that shrimp can obtain higher yields.

The establishment of the ecological environment includes artificial control of water temperature, salinity, transparency, substrate, water depth and predator organisms, so that it is in the most suitable environment for shrimp needs, and then through reasonable seedling, supplemented by feeding, higher yields can be obtained.

Due to the less bait and less organic matter in shrimp farming wastewater, this method has little adverse impact on the environment and can achieve high economic benefits. Therefore, it is also a breeding method worth promoting.

3. Intensive cultivation method.

This method is generally used in smaller ponds. Shrimp farming in this way requires good pond conditions, high water exchange rate, aeration equipment, complete facilities, artificial high-quality bait, and high seedling volume per unit area.

As long as the environmental control is reasonable and the feeding is reasonable, a higher yield can generally be obtained. The yield per mu of intensive farming in China is up to 1050 kg, and the benefits are also very high.

However, this method requires a lot of funds, a large investment, a large risk, a high bait coefficient, and a serious environmental pollution. Therefore, from the perspective of long-term benefits, large-scale promotion should not be advocated.

4. Polyculture.

Polyculture refers to the stocking of other fish, shellfish, algae, crabs and other species while raising shrimp, and the aquaculture products include shrimp and polyculture species.

In principle, the selection of polyculture species is not predatory to shrimp, does not affect the survival and growth of shrimp, does not compete with shrimp for food or has weak ability to compete for food, preferably omnivorous or scavenging, and can use shrimp residues.

Through polyculture, it can improve the utilization rate of bait, reduce the organic pollution of shrimp farming wastewater, improve production and increase economic benefits, and also reduce the risk of monoculture shrimp disease and extinction.

5. Other ways.

There are also a variety of breeding methods, such as intensive shrimp farming, net enclosure shrimp farming, cage shrimp farming, etc. These breeding methods are rarely used in China.