The pilot steered the ROV toward the bottom with a pair of joy sticks. On the video monitors a rain of plankton gave way to a lunar landscape of pebble fields and small boulders. P3S2 was hovering at a depth of 104 feet. Its spotlights and three video cameras illuminated tall sea anemones growing on the rocks like stalks of broccoli. Fish darted around mussels, scallops, and the occasional starfish.
"This looks like a high-rent district," Steneck said. Steneck's research assistant switched on the video recorder and noted time and depth on a clipboard. Moments later a lobster antenna became visible.
"There's one," Steneck said. "He's hiding between those two boulders."
The pilot pressed his joy stick for a slow-motion dive. P3S2 nudged the boulder, and the lobster's antenna twitched. The pilot pulled the ROV back, and the lobster emerged, strutting forward, claws extended and antennae whipping the water. If he had been able to see the ROV, the lobster might have been unnerved—but despite the fact that they are endowed with some 20,000 eye facets, lobsters have terrible vision. They have sensitive touch receptors, however, and an acute sense of smell. Two long antennae and thousands of tiny hairs on their claws and legs give them ample information about their environment. Like houseflies, lobsters can even taste with their feet. A second pair of shorter antennae, known as antennules, contain 400 chemoreceptors and give lobsters most of their hunting and socializing skills. But P3S2 didn't emit a recognizable scent.
"That's it, baby," Steneck said to the lobster. "Work the camera." Steneck wanted a side view, in order to get a laser measurement. When the lobster turned to walk away, Steneck said, "Paint him with the lasers." A pair of laser beams hit the lobster squarely on a claw and the tail, providing a gauge of its size. This routine was more or less what Steneck and his team would be doing every day, ten hours a day, for the coming week.
"Is that another set of claws right there?" the ROV pilot asked, aiming for another boulder. "I don't think so," Steneck said. "That looks like a molt. Empty shell." But Steneck's attention was attracted by something else: the pebbly ground at the base of the boulder was a lighter color than the surrounding bottom, and had been carved into a small crater. "Hold it," Steneck said. "We've got recent sediment-reworking here. Let's take a closer look." The investigation paid off. The actual lobster, perhaps still soft from having recently shed its shell, was hiding around the corner, its presence betrayed by the burrow it had dug for itself.
The lobster wouldn't budge from its protected spot, but Carl Wilson saw a retreating shape in a corner of the screen. "Is that one?" he asked. The pilot changed course, and P3S2 slowly gained on the lumbering lobster. This one clearly hadn't shed recently—large barnacles grew on its shell, an indication of its size, because bigger lobsters molt less often. Alerted to a presence behind it, the lobster spun, faced P3S2 head on, lifted its claws wide, and ran directly at the ROV. "You're going to lose," the pilot said. At the last second the lobster seemed to reach the same conclusion, and it backed off.
The first lobsterlike decapods probably evolved around 400 million years ago. Today there are thirty or so kinds of clawed lobsters, and forty-five species of clawless ones. By far the most abundant clawed lobster is Homarus americanus, or the American lobster. To the European explorers who arrived on the Maine coast in the 1600s, this greenish-brown crustacean looked familiar, because European waters are home to the American lobster's closest cousin: the bluish-black Homarus gammarus. But nowhere else in the world is Homarus as plentiful as it is in the waters off Maine. The explorers caught lobsters easily with long hooks or by dragging nets; later fishermen used a net hanging from an iron hoop and shaped like a cauldron—thus "pot," a term still used today to refer to a trap.
The basic design of the modern lobster trap was developed in the 1830s, and except for a switch from wood to wire, it hasn't changed much since. The number of traps in the water has changed dramatically, however. Records at the Maine Department of Marine Resources indicate that 50,000 to 100,000 traps were in use in 1880. Today some 2.8 million traps blanket the Maine coast.
A lobster trap is a wire-mesh rectangle almost four feet long, divided into sections: a "kitchen" and one or two "parlors." The bait bag hangs in the middle of the kitchen. On either side of the kitchen the wire is replaced by a ramp, made of knit twine, that ends in a small hole. Lobsters have an easy time walking up the ramp and through the hole into the kitchen; finding the hole and getting back out is more difficult. Many of those who can't find their way out are suckered into trying to escape on a third twine ramp—which leads to the parlor, designed to keep them stuck until the trap is hauled in by a lobsterman. Little lobsters have a Get Out of Jail Free card: the parlor is fitted with vents through which they can usually escape. Weather permitting, Bruce Fernald hauls his traps about every four days, and generally leaves them in the same area for several weeks. When lobsters begin to migrate elsewhere, he shifts the traps to follow them.