Sebastian Junger: The Perfect Storm: A True Story of Men Against the Sea

For every trip like that, though, there’s a dozen busts. Fish are not distributed equally throughout the water column; they congregate in certain areas. You have to know where those areas are. You generally set westward into the current. With a thermocline scope you get temperature readings at different depths; with a Doppler you get the velocity and direction of subsurface currents at three different levels. You want to set in “fast water” because the gear covers more area. You might anchor one end of the gear in cold water, which moves more slowly, because then you know where to find it. You want to hang the bait between layers of warm and cold water because the food chain tends to collect there. Squid feed on cold-water plankton, and swordfish dart out of pockets of warm Gulf Stream water to feed on the squid. Warm-water eddies that spin off the Gulf Stream into the North Atlantic are particularly good places to fish; captains track them down with daily surface temperature maps from NOAA weather satellites. Finally, you want to avoid the dark of the moon when you plan your trips. No one knows why, but for several days before and after, the fish refuse to feed.

Sword boat captains are required by law to keep records of every position fished, every set made, every fish caught. Not only does this help determine whether the boat is adhering to federal regulations, but it allows marine biologists to assess the health of the swordfish stock. Migratory patterns, demographic shifts, mortality rates—it can all be inferred from catch logs. In addition, observers for the National Marine Fisheries Service occasionally accompany boats offshore to get a better understanding of the industry they’re charged with regulating. On August 18, 1982, the principal planner for the Massachusetts Coastal Zone Management Program, Joseph Pelczarski, left on such a trip. He steamed out of New Bedford aboard the Tiffany Vance, a California longliner that was going to try gillnetting off Georges Bank. (The gillnet was new to the East Coast and Pelczarski wanted to see how it worked.) Spotter planes, as it turned out, reported almost no swordfish on Georges, but infrared satellite imagery revealed an enormous warm water eddy at the Tail of the Banks. Alex Bueno, the ship’s captain, decided to try longlining up north, and Pelczarski went with him. Pelczarski’s account had almost no impact on gillnet regulations—they made just one set and caught just one fish—but it gave government biologists and statisticians one of their few glimpses of life on a longliner:

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