For a while they sat, and Suchen remembered the splash of a fish breaking the surface of the water, and two egrets taking off with unhurried elegance, one after the other.

NEWYORKER: Alone

Coastal fisherman know that when a flock of seagulls is circling and diving into the sea a school of bluefish is often driving bait fish towards the surface and the anglers hasten to cast their lines into the frothy water beneath the screeching birds.

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Changing temperatures in the lake during the winter could have brought stagnant water to the surface, thus asphyxiating entire schools of fish.

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Seen at ground level in early morning light, it can look beautiful--shimmering, lakelike, as if fish were swimming underneath its blue-white surface.

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Even so, for safety reasons, their dives were strictly time-limited, and each sortie saw a quick scramble to net as many different fish as possible before the required slow ascent to the surface.

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After all, seeing cool fish and colourful coral is the main reason divers descend below the surface.

BBC: Underwater volunteer vacations

Coral reefs are home to 25 percent of the world's marine fish species, and cover 1 percent of the Earth's surface, making them the largest single living structure on Earth.

CNN: All About: Coral Reefs

Once in a fish's brain, this parasite pumps out powerful molecular signals, known as fibroblast growth factors, that cause the fish to shimmy, jerk and dart to the water's surface.

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The fish bite a noodler's unprotected arm, then are wrestled to the surface.

FORBES: Magazine Article

As the fish sped off and line played out, Whalen struggled for 45 seconds back to the surface.

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