White hairy crab
Have you seen it?
The crab body is white
Crab roe and crab paste are visible to the naked eye
On the table of Shanghainese this fall
A new delicacy will be added
- "White Jade Crab"!
A few days ago, a new round of new strains of river crabs
The "Chongming No. 1" parent cage hanging ceremony was held
The new strain is tentatively named "White Jade Crab"
Behind the cultivation of this "deliciousness".
It is Shanghai Ocean University
The wisdom of the team of the School of Fisheries and Life Sciences
At the beginning of 2016, Wu Xugan, a professor at the School of Fisheries and Life Sciences of Shanghai Ocean University, accidentally found that some of the crab shells in the river crab breeding ponds in Xinghua, Jiangsu Province and Chongming, Shanghai Province, were white or light yellow in color, so he took samples and brought them back to the laboratory for research.
"White-shelled crabs are already available in nature, but they are extremely rare. Wu Xugan said, "You may take it for granted whether you have albinism. Actually, it's not the result of natural evolution. ”
△ Wu Xugan (right) and graduate students check the growth of crab seedlings
At the beginning of that year, the team of professors Cheng Yongxu and Wu Xugan led the graduate students to select these white-shell crabs for family and group breeding. After four generations of purification, a new strain of "white jade crab" has been formed.
"In the past two years, we have selected adult crabs with large bodies and pure white shells as the next generation of parents, and the retention rate is only about 5%, which is very strict. Wu Xugan said.
After cooking, the "white jade crab" can still maintain its unique white shell shape and will not change color like ordinary hairy crabs. Wu Xugan explained that this is because the shell of the "white jade crab" lacks astaxanthin and β-carotene. "The test found that the content of astaxanthin, β-carotene and zeaxanthin in the crab roe and crab paste of 'white jade crab' was no different from that of ordinary blue-shell crabs. Wu Xugan said.
As for the edible rate and nutritional value, the ratio of crab meat, crab roe and crab paste, as well as the contents of protein, fat, essential amino acids and fatty acids are very close to each other. The research team also found that the "white jade crab" and the green shell crab had similar reproductive performance and embryo quality, but the egg-holding rate of the white shell strain after mating was significantly higher than that of the latter. In addition, the "white jade crab" grows faster, and the proportion of "big guys" is also higher.
At present, "white jade crab" has become a "conspicuous bag" at agricultural fairs in many places. Some crab companies sell in the form of a gift box of 1 white jade crab with 7 green shell crabs, and the reservation is hot. In the autumn of this year, the first batch of "Chongming No. 1" adult crabs will be officially launched. At that time, friends who love crabs will have the opportunity to feast!
Editor: Wu Baixin
Source: Xinmin Evening News Workshop
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