Video shows a giant swarm of red crabs clambering over each other on the floor of the Pacific as they migrate to better feeding grounds.
A team of scientists captured the phenomenon as they surveyed the ocean floor, more than a thousand feet below the surface in low-oxygen waters, using a manned submersible off the coast of Panama.
“When we dove down in the submarine, we noticed the water became murkier as we got closer to the bottom,” Jesus Pineda, a biologist at Woods Hole Oceanographic Institution and lead scientist on the recent expedition, explained in a press release. “There was this turbid layer, and you couldn’t see a thing beyond it. We just saw this cloud but had no idea what was causing it.”
“As we slowly moved down to the bottom of the seafloor, all of the sudden we saw these things,” Pineda said. “At first, we thought they were biogenic rocks or structures. Once we saw them moving — swarming like insects — we couldn’t believe it.”
DNA testing confirmed the crab species, Pleuroncodes planipes. The red crabs are also known as pelagic red crabs or tuna crabs, and are common along the coast of Baja California. The species has never been observed so far south.
“To find a species at the extreme of their range and to be so abundant is very unusual,” Pineda added.
The warm waters of El Nino have inspired a number of strange appearances on the California coast over the last 18 months — with sea snakes, crabs, sea lions, seals, birds and other marine species showing up in places they rarely visit.
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