Current character analysis and 2 dimensional model for spawning site of chinese sturgeon 中華鱘產(chǎn)卵區(qū)水流特征分析及二維數(shù)值模擬
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 由于產(chǎn)卵地被破壞、環(huán)境污染和前蘇聯(lián)時期捕撈規(guī)定的取消,在過去的20年中,里海鱘魚的數(shù)量比原先減少了90 % 。