A shoal of fish will do this.

也反射声音。

This one named Wellington made a beeline to the fish.

这只叫惠灵顿企鹅径直走向了。

Future numbers of the fish will drop to dangerously low levels.

未来数量将降至危险水平。

At such a low temperature, fish keep still.

这样低温中，会聚集不动。

Many fish that depend on phytoplankton swam away from the area.

以浮游生物为食大量离开海域。

That way, the fish do not travel through unhealthy waterways.

这样，就不必通过不友好水路。

Fish usually swarm in the morning and evening when the southwest monsoon dominates.

通常在西南季风来临清晨和傍晚活动。

They followed the fish up a staircase, which opened into a grand ballroom.

他们跟着游向通往大宴会厅楼梯。

There might be a big one around that school, he thought.

那个周围很有一条大，他想。

At the first sign of trouble, schooling fish swim as close together as they can get.

一旦发现危险，尽游得紧紧地。

As a result, sea birds and sea lions that eat those fish starved.

最终导致以为生海鸟和海狮失去食物来源。

Scientists can't say for sure if the fish that the noises attracted actually stuck around.

科学家无法确定噪音所吸引是否会逗留。

Although these populations might be able to adapt by shifting their spawning grounds northward.

尽管这些以通过将产卵地向北迁移来适应这一变化。

It's these shoals that support most of the world's sea mammals.

也养育了世界上大多数海洋哺乳动物。

Oil-rig reefs may shelter and feed up to eight tonnes of fish.

石油钻塔珊瑚礁以给高达8吨提供庇护以及食物。

But when reefs are bleached or damaged, the fish flee, and the reef suffers.

但当珊瑚礁白化或受损后，会逃走，礁石也会遭受破坏。

Reaching speeds of up to 20mph, Puck's son India chases the shoal towards the shore.

因迪亚时速高达每小时 20 英里，赶着往岸边去了。

So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.

从测定海深到测定，这一进展比较容易。

He swam above the fish shoal, and then...he slapped the water, killing or stunning the fish.

鲸游到上方，然后拍打水流将杀死或击昏。

The number of fish in the sea has dropped by 50% since 1970s.

自 1970 年以来，海里数量已经下降了 50%。