Biologists speculate that the mostly likely cause was a shift in Pacific Ocean currents, but food availability, changing river conditions and predator-prey relationships could be affecting the fish.
生物学家推测，最有可能的成因是太平洋洋流的变化，不过食物的取得、河流环境的改变、生物掠夺关系等，也都可能对鲑鱼造成影响。
The oceans have become more acidic as a result of the buildup of greenhouse gases, and the warming of rivers and lakes is affecting freshwater fish and other species.
海洋正因温室气体的累积而趋向酸化，而河流湖泊的变暖正影响淡水鱼等生物的生存。
In 2007, 100,000 fish at Northern Ireland's only salmon farm were killed by the same "mauve stingers" that are affecting the Spanish beaches.
2007年，和正在影响西班牙海滩一样的“淡紫色刺客”杀死了北爱尔兰自治区唯一鲑鱼养殖场的十万条鱼。
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