Even the Danjiangkou Reservoir, a key component of the south-to-north water diversion project, saw its water levels drop drastically to 4.23 meters below its dead water level on Saturday, he said.

他说，即使是丹江口水库——南水北调工程的重要组成部分，其水位周六也降到较死水位低4.23米的水平。

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It reported that fish kills can be caused by hypoxia, or low levels of oxygen in water, and the northern Gulf of Mexico is known as the largest so-called "dead zone" in the United States.

报道称，鱼的死亡可能是因为突然缺氧引起的，而且北部墨西哥湾有美国“死亡地带”之称。

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However critics say the policy has failed, with increasing instances of "discarding" where dead or alive fish are thrown back into the water because quota levels have already been reached.

BBC: Common Fisheries Policy Green Paper