Shrinking fish 水温高鱼变小

更新时间 2012年 10月 5日, 星期五 - 格林尼治标准时间14:57
Fish on fishing boat

Will the sizes of these catch be much smaller in the future?

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根据一项新的科研报告,世界各地的鱼类的体重和体积预计将缩小达 24%。研究人员说,不断上升的水温会减少海水的氧气含量,这将导致鱼类体重的显著减少。请听BBC科学记者 Matt McGrath 发回的报道:

Although projections of global temperature rises show relatively small changes at the bottom of the oceans, the resulting impacts on fish body size are "unexpectedly large", according to this research. As ocean temperatures increase, so do the body temperatures and metabolic rates of the fish. This means they use more oxygen to stay alive and, according to the researchers, they have less available for growth.

They've calculated that up to 2050, fish will shrink in size by between 14 and 24 percent, with the Indian and Atlantic Oceans worst affected. The warming waters are also likely to drive fish more towards the poles, leading to smaller species living in areas like the North Sea.

According to the scientists, their models may underestimate the potential impacts. When they looked at case studies involving North Atlantic cod and haddock, they found that recorded data on these fish showed greater decreases in actual body size than the models predicted.

Quiz 听力测验

Is the temperature at the bottom of the sea going to rise significantly in the future?

No, there will be relatively small changes of temperature at bottom of the sea.

What’s the phrase used to describe the amounts of energy used over a certain period of time?

Metabolic rate.

What’s the likely percentage reduction in fish body size according to the report?

Between 14 to 24 per cent.

Which two fish species were studied for the report?

Cod and haddock.

Glossary 词汇表 (点击单词收听发音)

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