脆弱天堂 20-英语听力

[00:00.11]There are 150 tonnes of fish in this one haul.
这一批渔获 共有150吨 [00:05.31]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 [00:10.45]These are mostly yellowfin tuna, plus some skipjack.
这里面多数是黄鳍鲔和鲣鱼 [00:14.72]As they're slower breeders than skipjack
因其繁殖速度较鲣鱼慢 [00:17.46]Many yellowfin are caught before they're old enough to breed.
所以捕到的黄鳍鲔 多未成熟 [00:21.23]This makes them more vulnerable to over-fishing.
这导致它们 更容易因滥捕而锐减 [00:24.79]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 [00:28.87]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 [00:34.21]A four-fold increase in as many decades.
几十年来渔获量 增加了四倍 [00:37.57]Almost 2/3 of the catch now comes from the Pacific.
其中近三分之二 来自太平洋 [00:41.81]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 [00:46.51]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 [00:50.05]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 [00:54.70]Otherwise they can't breathe.
否则它们就无法呼吸 [00:56.97]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 [01:00.55]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 [01:04.34]causes the quality of their meat to deteriorate.
会使肉质变差