Scientists with a Chinese sturgeon conservation authority announced
on Monday that the population of the rare fish in the
Yangtze River
appeared to have dropped sharply since last year.
A report from the Shanghai Yangtze Estuary Chinese Sturgeon
Conservation Administration said that by last Wednesday, scientists
had located just 14 young sturgeon in the Chongming monitoring
base, an area where the fish are believed to gather, compared with
600 at the same time last year.
"We used the same methods to trace the fish at the same time and
place, but unfortunately that's the result we got," said Liu Jian,
director of the administration.
The report said at least 100,000 Chinese sturgeon had been
released into the Yangtze this year to restock the river. In
Shanghai alone, about 2,156 artificially-bred fry were released,
but only five had been detected to date.
Since November last year, 11 adult Chinese sturgeon had been
found dead, most killed by ship propellers and some in electrified
fishing nets, said Liu, adding that two sturgeon remained severely
injured.
On June 17, a 3.37-meter Chinese sturgeon was caught by
fishermen who were netting jellyfish at Jinhui port in Shanghai.
The fish, which suffered multiple lacerations, was recovering in
the conservation area.
Liu said the fish could need another two months to completely
recover.
"What we have found, the deaths and injuries, are abnormal, and
we fear they may be a bad omen for the ecological environment of
the Yangtze," Liu said.
The Chinese sturgeon, one of the oldest vertebrates in the
world, has existed for more than 200 million years.
However, rapid economic development, over-exploitation of the
river and shocking levels of pollution have taken a terrible
toll.
Scientists with the Yangtze River Fisheries Research Institute
said the number of sturgeon that migrated to the river each year to
spawn had dropped from more than 2,000 in the 1980s to just
500.
A report on Yangtze River protection and development says that
more than 600 kilometers of the river are in critical condition,
and pollution, damming and too many boats have caused a dramatic
decline in Yangtze aquatic life. ?
(Xinhua News Agency July 23, 2007)
