Stocks of the Caspian's beluga sturgeon have dropped by about 90 percent over the past two decades due to destruction of spawning sites, pollution and the end of Soviet-era fishing regulation.
Stocks of the Caspian's beluga sturgeon have dropped by about 90 percent over the past two decades due to destruction of spawning sites, pollution and the end of Soviet-era fishing regulation.
由于产卵地被破坏、环境污染和前苏联时期捕捞规定的取消，在过去的20年中，里海鲟鱼的数量比原先减少了90%。