The world's first 2.5 -generation Chinese cricket seedlings are almost one year old!

The Yangtze River Daily Da Wuhan Client September 22 (Reporter Jin Wenbing Correspondent Liao Xiaolin) "Our Chinese small fish fry is almost one year old. How old is they now? The public has always paid attention." September 21st, on September 21, The Hanyang Test Base of the Institute of Water Engineering Ecology of the Chinese Academy of Sciences of the Ministry of Water Resources "Three Gorges Rare Extraordinary Aquatic Animal Given Resource Library", the researchers conducted a routine medical examination of a group of 2.5 generations of sons that were born in October last year. The precious fish fry grows well.

"At present, there are about 4,800 tails in the live storage. There are 2.5 generations of Chinese catfish seedlings. Their total length of them is generally more than 50 cm and weighs more than 500 grams. It is very lively and cute." Yang Bo, the main member of the Chinese Research Team, said.

Researchers selected some of these large -scale fish fry for sampling measurement. Most individuals reached 60-70 cm in length, 1000-1500 grams, and the maximum individuals reached 79 cm in length, and weighing more than 2100 grams.

Yang Bo introduced: "The growth rate of these fish seedlings is different, and the difference between individuals becomes larger. Therefore, we are breeding them as much as possible according to different specifications, so that the same specifications of fish seedlings live in the same breeding pool to facilitate science to facilitate science Nutritional supply and daily management. "

In October last year, a generation of female Chinese in the living library was about to be a "mother". Researchers used the second -generation male and Chinese crickets to help them complete the "childbirth and childcare". At that time, Tian Hua led the launch of the China -China frozen sperm recovery artificial insemination test work and achieved good test results.

Because the mother is the first generation of females, her father is the second -generation male fish, this batch of hatching fry is called the child 2.5 generation. On March 28, May 21, and June 6 this year, these fish seedlings were distributed nearly 53,000 times. Among them, on March 28, Wuhan's largest Chinese stale release activity, the Yangtze River Daily conducted in -depth reports.

On the 21st, the researchers selected a large number of individuals for PIT labeling and cutting fin samples. "We will bring these fin samples to the molecular ecological laboratory to extract DNA, and use DNA gender appraisal technology and PIT marking records to screen for female individuals. Enhanced cultivation and cultivation. "Tian Hua, the main member of the Chinese Research team, told reporters.

It is understood that the research team plans to select about 1500 tails of 2.5 generations of Chinese catfish from the existing child 2.5 generation of Chinese catfish seedlings as reserve pro -fish. Other fish fry will flow into the river in batches to supplement the number of natural population in China.

【Edit: Wang Rongfei】

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