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世界海洋风险警告对海鲜供应的影响研究
Study Warns of Risk to Seafood Supplies in World's Oceans
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This is the VOA Special English Agriculture Report. A study has warned(警告) that seafood supplies（供给）from the world's oceans could be almost gone by the middle of the century（世纪）. The researchers say there has already been a collapse（灭绝）in wild populations of almost one-third of currently fished seafoods. The study says that means（方法）their catch has fallen by ninety percent from their highest levels. Boris Worm of Dalhousie University in Nova Scotia, Canada, led the international（国际组织）team that did the study. Professor Worm says species have recently been disappearing（消失） from oceans at increasing（越来越多）speed. At this rate, he says, all seafood species could collapse by two thousand forty-eight.
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Other studies have also warned about the dangers of overfishing(捕捞过渡) and the effects on ocean environments（环境）. But not everyone thinks the oceans are likely to be empty（空的）in fifty years. Some scientists said parts of the world do have problems, but others are doing a good job of protecting（保护）fish populations. Government officials in several countries with large fishing industries（产业）also questioned the research. The study appeared earlier this month in Science magazine. The researchers say damage(损伤) to oceans affects not only fish populations but also the productivity（生产力） of ecosystems. These complex systems help control water quality. The scientists say the loss of different kinds of sea life appeared（发表） to increase the risk of fish kills and beach closures from harmfu（有害的） algae growth.
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The scientists examined(调查) the results of thirty-two experiments（试验）and observed （观察）forty-eight protected areas. They also looked at records of catches worldwide. They studied records from the United Nations Food and Agriculture Organization for nineteen fifty to two thousand three. And they examined archeologica（考古学的）l information and other historical records for twelve coastal（沿海） areas. That research reached back over a thousand years. Boris Worm says the findings were, in his words, "beyond anything we suspected（对…有所察觉）." But he also said the situation is not too late to correct. He said that with good fisheries management（处理）, some species could completely recover in three to ten years. And that's the VOA Special English Agriculture Report, written by Jerilyn Watson. You can learn more about agriculture, and download（下载） transcripts and MP3 files of our reports, at voaspecialenglish.com. I'm Steve Ember.
