What happened to the death of Zhangzi Island scallops? How to raise it so as not to die?

Scallop is a kind of shellfish distributed in the sea areas of the world, and it is an important shellfish culture species in China. Among them, Zhangzi Island scallop is very famous, and what is the situation of the recent death of Zhangzi Island scallop? How to raise it so as not to die?

First, what happened to the death of Zhangzi Island scallops?

In fact, it was on the evening of November 11 that the listed company Zhangzi Island issued a notice saying that according to the summary of the per mu yield data that had been tested by the company from November 8 to 9, the average yield per mu of shrimp and Japanese scallop sown in 2017 in the tested area was less than 2 kg. In 2018, the average yield of Japanese scallop is about 3.5 kg per mu, which is much lower than the average yield of 25.61 kg per mu in the previous October.

According to the company's explanation, this is not a run, but a collective death. The announcement sampling test results show that based on the situation of scallops collected at the spot sampling test, there has been a large proportion of deaths of bottom-sowed scallops in the near future, with some sea areas accounting for more than 80% of dead shells. The time of death is close to the time of sampling and capturing, and there is no significant difference in the shell size between the dead shell and the surviving scallop. The ligaments between the shells of most dead shells are elastic, and some of the undecomposed software parts remain in the shell.

In other words, a large proportion of the scallops in stock died, and the time of death was just before the company took the test time.

At the opening of trading on November 12, the share price of Zhangzi Island fell by the daily limit. In early trading that day, the selling order was constantly overstocked on the falling limit board, and the funds fled frantically.

Second, how to raise scallops so as not to die?

1. Selection of sea area

We should choose the sea area where the water flow is slow, there are no big waves, the bait is rich, and the water temperature is above 13 ℃.

two。 Breeding method

There are mainly three methods: net cage, plastic bucket and net bag. Take the net cage as an example, the circular net cage, with a diameter of 30 cm, is divided into 6-7 layers, each layer spaced 15 cm apart, and the mesh 4mm. If the shell height is less than 1.5 cm, 500 seedlings should be placed in each layer, and 200-300 seedlings in each layer larger than 1.5 cm. A 60-meter-long float can hang 100 cages.

3. Daily management

It is necessary to divide the seedlings in time, check them frequently and wash the net cages frequently. The aquaculture water layer is generally 2-3 meters deep. In addition, after the scallop seedlings enter the pool, special personnel should be sent to take care of them. When it is found that some of the seedlings are floating on the surface of the water, they should use thin bamboo stems to release the air. Ten days after entering the pool, observe the growth status of scallop seedlings. If scallop seedlings grow fast and have a large number, the seedling bag should be replaced immediately, usually with a 30-mesh seedling bag. Then wait about 20 days to change the seedling bag again. The human pool should start to change water in about ten days, and the total amount of water per day is about 1/4. If the water color is too strong, you should increase the amount of water, and do not change water on windy days, because the water is too mixed. If it is found that the water color is too light, it is necessary to apply fertilizer in time, and the principle of fertilization should be applied frequently. It can also put in a large amount of photosynthetic bacteria and EM bacteria.

Scallop culture needs to master good culture techniques in order to be successful, food inexperienced friends should be careful to invest.