Preserved ... wrong

Efforts to preserve a rare species of fish fell back to the point when American scientists realized they were relocating another fish back to the lakes and rivers.

Researchers at the University of Colorado are trying to restore cutthroat salmon species, which lives in Colorado state, to their native residence since the early 1970s. They described the consequences of expensive efforts. and these decades are a " setback ".

" This is an amazing result ," said Jessica Metcalf, the lead researcher. " It is not the result we expected ."

Cutthroat blue-green salmon, declared extinct in 1973. When the restoration plan began, people used eggs and sperm of animals considered to be 9 remnant populations to breed. .

However, when analyzing DNA, recent researchers realized 5 out of 9 populations above not the cutthroat trout green, which is cutthroat Colorado river. Researchers say only new DNA can show the difference between the two species.

T. An