National Geographic : 2006 Aug
Gem/Tones The Emerald Sea, as these chill waters are called, turns deepest green in summer when plankton and algae flourish. Predatorsgrow large in the churning pea soup-like this seven-foot wolf eel fish with a volleyball-size head (below). A giantPacific octopus (life-size eye, middle right) might reach 20 feet. I expected to find octopuses hiding in caves when tides were flying, but that's when they feast, flattening theirbodies to undulate with the current as they snake along life-laden walls. A sculpin known as a red Irish lord (life size, bottom) wears its eyes high and moves each independently, giving the ambush predatora detailed view. To see how nutrient-saturatedcurrents feed creatures like sea urchins, I poured a nontoxic dye and watched it flow not around the urchin colony but right through it (top).