They are especially vulnerable because they swim slowly and close to the surface.
It is also showing where particular animals prefer to stay close to the surface, and where they prefer deeper waters.
Significantly, most of the potash resource lies relatively close to the surface at depths between 800 to 2, 000 feet below ground.
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Although no-one was seriously injured, the incident is a reminder of the violence lurking close to the surface in Zimbabwe, our correspondent says.
He wants turbine manufacturers to produce lower turbines, to take advantage of winds blowing strongly and steadily close to the surface of the sea.
But, like Larderello, today's geothermal electricity comes from unique geologies, where hot rocks and underground water sit together, close to the surface of the earth.
Emotions run close to the surface in the New Orleans Police Department these days, even for people like Captain Bernadette Kelly(ph), a 31-year veteran of the department.
Unlike other parts of Africa, where gold lies conveniently close to the surface, South Africa's gold lies deep beneath the ground, sometimes at depths of over four kilometres.
Sometimes it was dark humor, even gallows humor in the face of impending disaster, but the laughter was always close to the surface, ready to explode at any moment.
The research team has discovered that it is much harder for her to feed close to the surface - a possible clue to why her kind is dying out.
For those who have not been able to leave it behind, I can still see the emotion on their faces, the sense of loss they still carry close to the surface.
The asteroids hit the surface hard, over and over, and since the Moon has been a solid body for most of its history, their materials stay on or close to the surface.
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And so -- but apparently the ones that are being tested right now by all the big laboratories, they only can be used for skin cancer or places where the light can penetrate fairly close to the surface.
That seemed to support the notion that underground liquid water may reside close enough to the surface in some places that it can seep out periodically.
Orbiting the Earth in a path that was inclined at 45 degrees to the equator, passing as close to 590 miles to the surface of the Earth, Telstar could be used for just twenty minutes out of each two and a half hour long orbit to relay signals between the America, France, and the United Kingdom.
We're not even getting close to scratching the surface of the problem.
It also required me to stay fairly close to the table surface where the card was, otherwise, the AR connection would cut out if I moved too far.
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The project organisers said the capsules and their contents would experience "conditions which are very close to that of the surface of Mars".
Joplin is also very close to the Ozarks, whose rough surface clearly makes the state of Missouri an island in the annual tornado tsunami.
Returning to the yard, he had kept as close to the walls of the house as he could, pressing himself against the stucco surface each time he came to a window, more cautious than he guessed he had to be.
The community votes on ideas, and those that surface to the top get a very close look by Dell.
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While the Super AMOLED works its magic on those on-screen blacks, you'll still suffer some pixelation woes if you get too close to the qHD (960 x 540) surface.
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Certainly Surface as a brand is nowhere close to the sales of the iPad (over 23 million units sold).
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Its first grainy, wide-angle images showed its own left rear wheel parked on the surface of Gale Crater near the equator of Mars, close to the foot of a three-mile-high mountain it aims to explore in months to come.
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