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標題: [瞬間看地球] 海豚追逐魚群 [打印本頁]

作者: vandas    時間: 2013-9-21 03:30 PM     標題: 海豚追逐魚群

The incredible dolphins feeding frenzy showing them chase fish on to the shore so that they can eat them

A group of dolphins living off the Carolina and Georgia coast have come up with an unusual way in which to hunt.
Knows as ‘dolphin stranding’, the term is normally used to describe dolphins that have beached themselves for some reason.
However, new footage from ABC News and National Geographic show the mammals are using the same technique to hunt fish – essentially by forcing the fish up on shore.


Don't be fooled: They may appear cute and cuddly but dolphins are intrepid hunters of the sea


Remarkable: The footage was captured by National Geographic as part of their 'Secret Life of Predators' series


Plotting: The dolphins rush to the shore to capture the fish but first they confuse them



Scott Snider, National Geographic’s director of photography, says the dolphins use their echolocation to confuse their prey and then  chase them to the shore.

The dolphins’ strange feeding pattern while filming the documentary, ‘Secret Life of Predators.’

‘They’re constantly echolocating and hunting and trying to find these schools of mullet. And when they do, they’ll start to work them up. Once they get them right where they want them on just the right stretch of beach, there’s a vocal cue and they make a sound and they all rush at the same time,’ Mr Snider told ABC News.

‘They all make this bow wave and it throws and crashes and breaks these mullet up on the beach,’ he continued. ‘Then they lay there on their sides, mouths open, waiting, trying to catch these mullet that are flopping back down.’


Confusion: Underwater the dolphins make sounds that disorientate the fish making them easy prey


Thrashing: The dolphins race towards the shore and using underwater cues ready themselves for the onslaught


Full steam ahead: The dolphins beach themselves and literally force the fish ashore too

Right before they beach themselves, the dolphins make a ‘strong’ noise, Snider said.
‘You’ll hear a lot of clicks and whistles while they’re shoring up the fish,’ he said. ‘Then all of the sudden there’s a strong vocalization — a much louder noise — right before they’re going to strand, switching a half a second to a second every single time.’

After rushing the fish, the dolphins beach themselves, and wait for the fish to make their way back to the shoreline, hoping to catch one in their mouths as they wait.

Dolphins are often thought of as friendly, innocent, almost cuddly creatures of the sea, but biologists say we should see these mammals as the cunning and ruthless hunters they really are.


Good idea? Scientists believe it's either an ingenious way of catching fish or a suicide mission


Beached: The dolphins can't afford to hang around long as they could get burned by he sunshine or damage their internal organs as the water is no longer supporting their 400lb weight


On target: Looks as though the tactics worked on this occasion as this fish has no chance as approaches the jaws of a dolphin


Dinner: The dolphins have proven to be adept at catching fish in this manner

‘They need to make a living, they’re predators, and they are good at it,’ Snider said. ‘They’re just like lions or tigers or anything else for their niche.’

Scientists are divided on whether this is really an effective hunting method or more of a suicide mission. For although the dolphins seems to be experts at this method of hunting, they could also be causing themselves more harm than good. If they stay on the beach shoreline too long, they can burn or crush their internal organs.

‘A lot of bad things can happen,’ said Mr Snider.’ There is of course the ongoing threat of humans getting in the way of their hunting patterns, and other threats such as oyster shells and other trash that could slice open a dolphins’ rubbery skin.’

So although these creatures may be among the most intelligent mammals, this new found style of hunting, may not be the more practical.


Worried: Scientists are concerned that the dolphins may injure themselves permanently or slice their skin open on sharp objects that are left on the beach


Wonder if it will catch on? A group of dolphins off the Carolina coast have come up with a unique way of hunting fish. It involves a great deal of thrashing before beaching themselves on shore

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作者: eaglelu    時間: 2013-9-21 09:40 PM

我看過BBC關於海豚因各族群的所處地理環境不同,演化成各式捕獵行為。
有一種海豚會快速游過魚群外圈,激起海土翻滾,讓魚以為是天然屏障,
只留一個缺口,魚群因驚嚇緊往該缺口逃脫,但其他海豚早以守候在此,
以為逃脫,卻入豚口!海豚輪番上陣,履試不爽。從高空中會看到一圈圈的圖樣,
就是海豚的傑作。好聰明的物種!!
作者: riderkid    時間: 2013-9-22 04:57 AM

牠們是水下民族, 捕魚高手; 就像人類的漁夫一樣, 有悠長的捕魚歷史, 懂得運用天生靈活的腦袋想出完善捕擸方法. 海豚好像是恐龍進化出來, 很可愛, 又善解人意, 不像牠的祖先打擸時粗暴霸道, 狂風掃落葉

不過, 很不喜歡美軍訓練牠們背著炸彈潛住敵方自爆, 非常不人道.
作者: fidodidow2k    時間: 2013-9-22 10:52 PM

聰明.
難怪各國海洋世界都有祂們的表演.
作者: hkgorchid    時間: 2013-9-23 02:11 PM

Dolphins are smart mammals. They can use different technical skills to catch fishes. Sardine is their favorite!
作者: coolmam    時間: 2013-9-29 05:35 PM

大開眼界,thanks for sharing!
作者: koonwah    時間: 2013-10-1 10:29 AM

海豚, 捕魚高手,在電視台看過,全世界得此群海豚用這方法捉魚
作者: sawchuchu    時間: 2013-10-1 06:21 PM

thanks for sharing
作者: antimatter    時間: 2013-10-14 02:12 AM

this is just like a mappy game under water




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