54 million Yellow Corbicula seedlings released to the sea

Large-scale artificial breeding of Rhizoma Euphorbiae in Dandong is expected in the future.

"after three years of efforts, we have cultivated Chinese clam seedlings with an average size of 5.4 mm this year, which will greatly increase the survival rate of release." On August 10, Yuan Tian, head of the Disease and Prevention Department of the Dandong Aquatic Technology Promotion Station, who had just returned from the Donggang Seedling Center, told reporters that a few days ago, they successfully released more than 54 million newly cultivated Chinese clam cubs to the sea area of Dalu Island in Donggang. "the research on artificial breeding and intermediate cultivation technology can provide large-scale seedlings for Chinese clam beach culture, shallow seabed sowing and multiplication, proliferation and release, and effectively increase the amount of resources."

Chinese clams are commonly known as "yellow clams". The wide tidal range of the shoal adjacent to Dandong is large, affected by the runoff of Yalu River and Dayang River, the exchange of offshore waters is active, the seawater salinity is moderate, and the bait organisms are rich, which makes Dandong rich and tender aquatic animals such as yellow clam. It is reported that in 2011, Dandong Huangjianzi was registered through the geographical indications of the Ministry of Agriculture. At the end of 2015, after the on-site examination and evaluation by the expert group of the Ministry of Agriculture, all the indicators created by the demonstration model of "Donggang rhubarb clam" passed the acceptance.

It is understood that due to the influence of various factors, the output of yellow clam is decreasing year by year, and only more than 5000 kilograms of yellow clam can be caught above specifications every day, which is more than 90% lower than that of more than a decade ago, so there is an urgent need to carry out seedling propagation and resource restoration. "in order to explore the artificial breeding technology of Rhizoma Corydalis, since 2012, I have set up a project to study the artificial breeding technology of Chinese clam, in order to solve the problem of the source of artificial breeding and provide technical reserves for large-scale seedling production and promotion in the future." Yuan Tian said that in 2013, they bred 38.7 million young shellfish, with an average shell length of 465.3 microns. 120 million young shellfish were bred in 2014, with an average shell length of 1.3mm. This year, they finally bred 54.12 million young shellfish with an average shell length of 5.4mm. In July this year, the technology project of artificial breeding and intermediate cultivation of Chinese clam successfully passed the appraisal of scientific and technological achievements of Dandong Science and Technology Bureau.

Artificial multiplication and release play an important role in economic growth and regional ecological balance. Artificially cultivated juvenile shells grow to more than 0.5 mm and can be released, and the 5.4 mm large seedlings released this year will greatly improve the survival rate of release and play a positive role in restoring resources in the region. " Yuan Tian said, "there are 130000 mu of seawater ponds and 1.08 million mu of shallow sea in Dandong. In the future, if pond culture is carried out, about 24 billion young shellfish will be needed every year, and if they are multiplied in shallow water, the demand for seedlings will be even greater. "