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(单词翻译:双击或拖选)
This is the VOA Special English Agriculture Report.
People in a community on the Pacific coast in Southern California awoke last week to a sea of dead fish. About eight hundred fifty sailboats and powerboats come and go from the marina at King Harbor in the city of Redondo Beach. But the sardines1 that swam into the marina never swam out. Estimates put the number of dead fish in the millions.
Local resident John Archibald described the smell this way.
JOHN ARCHIBALD: "Not bad. But I would not be ordering any pizzas around here lately."
Reporter Pete Demetriou from KNX Newsradio in Los Angeles also spoke2 to another man who has lived in the area for twenty-six years.
MAN: "The die-off was as bad as I've ever seen, but they cleaned up pretty quick, so there's not too much smell."
REPORTER: "Well, you've got a few fish on the top here but they're concerned that a lot of it may still be down there on the bottom. What do you do, do you try to clean it up or let it just basically decompose3?"
MAN : "No, you just let it go. The crabs4 will get it."
Dead sardines removed from the surface at King Harbor marina in Redondo Beach, California
He remembered that about five years ago there was another serious kill-off of fish in King Harbor. It was caused by a harmful algae5 bloom, a so-called red tide of microscopic6 organisms that spread from time to time. But this time scientists found no toxic7 algae in King Harbor, so it was a mystery.
On Friday a scientist at the University of Southern California released findings of continuing research in his laboratory. Professor David Caron said fish collected on March eighth, the day of the kill, tested "strongly positive" for domoic acid in their stomach contents. Domoic acid is a powerful neurotoxin produced by one kind of microalgae.
Fish such as sardines and anchovy8 can get poisoned when they eat plankton9 that have eaten the algae.
Researchers from USC confirmed that plankton collected about twenty kilometers southwest of Redondo Beach the next day had very high levels of domoic acid. This would support a theory that the fish became poisoned in coastal10 waters before entering the harbor.
High levels of domoic acid in the sardines may have worsened the effects of oxygen loss in the water as the fish crowded into a limited space. Or the domoic acid may help explain why they entered the marina. Professor Caron said research shows that domoic acid poisoning can cause abnormal swimming in some kinds of fish.
Harmful algae blooms are a common cause of fish kills. Domoic acid can also cause neurological disorders11 and death in animals that eat fish poisoned with the neurotoxin.
And that's the VOA Special English Agriculture Report, written by Jerilyn Watson. If you ever miss one of our programs, go to voaspecialenglish.com to find transcripts12 and MP3s of all of our reports. I'm Karen Leggett.
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1
sardines
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n. 沙丁鱼 | |
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2
spoke
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n.(车轮的)辐条;轮辐;破坏某人的计划;阻挠某人的行动 v.讲,谈(speak的过去式);说;演说;从某种观点来说 | |
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3
decompose
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vi.分解;vt.(使)腐败,(使)腐烂 | |
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4
crabs
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n.蟹( crab的名词复数 );阴虱寄生病;蟹肉v.捕蟹( crab的第三人称单数 ) | |
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5
algae
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n.水藻,海藻 | |
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6
microscopic
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adj.微小的,细微的,极小的,显微的 | |
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7
toxic
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adj.有毒的,因中毒引起的 | |
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anchovy
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n.凤尾鱼 | |
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9
plankton
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n.浮游生物 | |
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10
coastal
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adj.海岸的,沿海的,沿岸的 | |
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disorders
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n.混乱( disorder的名词复数 );凌乱;骚乱;(身心、机能)失调 | |
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transcripts
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n.抄本( transcript的名词复数 );转写本;文字本;副本 | |
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