BBC听力 | 脆弱天堂 19

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There are 150 tonnes of fish in this one haul.

这一批渔获 共有150吨

It used to take a fishing vessel one whole year to catch this many fish.

相当于早期每艘渔船 一年的渔获量

These are mostly yellowfin tuna, plus some skipjack.

这里面多数是黄鳍鲔和鲣鱼

As they're slower breeders than skipjack

因其繁殖速度较鲣鱼慢

Many yellowfin are caught before they're old enough to breed.

所以捕到的黄鳍鲔 多未成熟

This makes them more vulnerable to over-fishing.

这导致它们 更容易因滥捕而锐减

Tuna fishing has grown into an 8-billion-dollar industry.

捕捞金枪鱼 已发展成为一项产值达80亿的产业

And over 4 million tonnes of tuna are caught worldwide each year

全球每年的金枪鱼捕获量 超过四百万吨

A four-fold increase in as many decades.

几十年来渔获量 增加了四倍

Almost 2/3 of the catch now comes from the Pacific.

其中近三分之二 来自太平洋

In the Atlantic, yellowfin catches have been shrinking since 1990.

大西洋的黄鳍鲔产量 自1990年开始减少

Now a similar decline has begun in the Pacific.

现在太平洋的渔获量 也呈现出类似的下降趋势

Tuna need to swim constantly to keep water flowing over their gills

金枪鱼必须不断游动，让水流过鱼鳃

Otherwise they can't breathe.

否则它们就无法呼吸

The fishermen want to get them out of the water as quickly as possible.

渔民要尽快把它们 弄出水面

When starved of oxygen, a build-up of lactic acid in their muscles

如果缺氧过久，金枪鱼肌肉内部形成的乳酸

causes the quality of their meat to deteriorate.

会使肉质变差

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