Fears are now being voiced that the planned construction of an oil pipeline across the lake's bottom might revive pollution and cause the fish population to decline again.

现在有人担心，计划修建的穿越湖底的输油管道可能会重新造成污染，导致鱼类数量再次下降。

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Fish stocks in the Baltic are in decline.

波罗的海的鱼类资源逐渐减少。

《牛津词典》

It is not only tuna but sardine, mackerel and other fish that are in decline.

不仅仅是金枪鱼，沙丁鱼，鲭鱼和其他鱼类也在减少。

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If this traditional migration is hindered it could lead to a serious decline in fish reproduction which will unbalance the delicate food chain on which this ecosystem depends.

CNN: STORY HIGHLIGHTS

She highlighted the 90% decline in fish populations from baseline measurements and said that scientific challenges include acquiring an integrated global view, filling knowledge gaps, and knowledge on how humans can use and protect the oceans.

UNESCO: EDUCATION

"In addition to an approximately 60 percent decline in fish production, there has been degradation of pasturelands, leading to a shortage of animal feed estimated at 45 percent in certain places in 2006, reduction in livestock and biodiversity, " the agency said.

CNN: Massive African lake could dry up, U.N. agency says