南非沙丁鱼大迁徙：海洋生命的超级盛宴
Every winter, a breathtaking natural event unfolds along South Africa’s eastern coastline. From May to July, billions of sardines begin a massive northward migration from the cool waters of the Agulhas Bank. This shimmering procession, often stretching over seven kilometers, is so immense it can be seen from satellites. Locals and scientists call it 'the greatest shoal on Earth.'
每年冬季，南非东海岸都会上演一场令人叹为观止的自然奇观。从五月到七月，数十亿条沙丁鱼从阿古拉斯海架的冷水中开始大规模的北迁。这条闪闪发光的队伍往往绵延七公里以上，规模之大甚至能从卫星上观测到。当地人和科学家称其为“地球上最大的鱼群”。
The phenomenon is driven by a seasonal drop in ocean temperature. As the cold Benguela Current pushes north, it creates a band of nutrient-rich water close to shore. The sardines follow this marine highway instinctively. Yet the journey is far from peaceful—the dense shoal triggers a feeding frenzy, drawing predators from hundreds of kilometers away.
这一现象是由海洋温度的季节性下降所驱动的。当寒冷的本格拉洋流向北推进时，在近岸形成了一片富含营养的水域。沙丁鱼本能地沿着这条海洋高速公路迁徙。然而，这段旅程远非平静——密集的鱼群引发了捕食狂潮，吸引了数百公里外的掠食者前来。
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