Cod was divided into three categories. The best, known as "dun fish," was caught in the spring and shipped to Portugal and Spain, where it fetched the highest prices. (Lisbon restaurants still offer bacalao, dried codfish.) The next grade of fish was sold domestically, and the worst grade—"refuse fish"—was used to feed slaves in the West Indian canefields. Gloucester merchants left for the Caribbean with holds full of salt cod and returned with rum, molasses, and cane sugar; when this lucrative trade was impeded by the British during the War of 1812, local captains simply left port on moonless nights and sailed smaller boats. Georges Bank opened up in the 1830s, the first railway spur reached Gloucester in 1848, and the first ice companies were established that same year. By the 1880s—the heyday of the fishing schooner—Gloucester had a fleet of four or five hundred sail in her harbor. It was said you could walk clear across to Rocky Neck without getting your feet wet.
Cod was a blessing but could not, alone, have accounted for such riches. In 1816, a Cape Ann fisherman named Abraham Lurvey invented the mackerel jig by attaching a steel hook to a drop-shaped piece of cast lead. Not only did the lead act as a sinker, but, jiggled up and down, it became irresistible to mackerel. After two centuries of watching these elusive fish swim past in schools so dense they discolored the sea, New England fishermen suddenly had a way to catch them. Gloucester captains ignored a federal bounty on cod and sailed for Sable Island with men in the crosstrees looking for the telltale darkening of mackerel in the water. "School-O!" they would shout, the ship would come around into the wind, and ground-up baitfish—"chum"—would be thrown out into the water. The riper the chum was, the better it attracted the fish; rotting chum on the breeze meant a mackerel schooner was somewhere upwind.
Jigging for mackerel worked well, but it was inevitable that the Yankee mind would come up with something more efficient. In 1855 the purse seine was invented, a 1,300-foot net of tarred twine with lead weights at the bottom and cork floats at the top. It was stowed in a dory that was towed behind the schooner, and when the fish were sighted, the dory quickly encircled them and cinched the net up tight. It was hauled aboard and the fish were split, gutted, beheaded, and thrown into barrels with salt. Sometimes the school escaped before the net was tightened and the crew drew up what was called a "water haul"; other times the net was so full that they could hardly winch it aboard.
Purse seining passed for a glamorous occupation at the time, and it wasn't long before codfishermen came up with their own version of it. It was called tub trawling and if it was more efficient at killing fish, it was also more efficient at killing men. No longer did groundfishermen work from the relative safety of a schooner; now they were setting out from the mother ship in sixteen-foot wooden dories. Each dory carried half a dozen 300-foot trawl lines that were coiled in tubs and hung with baited hooks. The crews rowed out in the morning, paid out their trawls, and then hauled them back every few hours. There were 1,800 hooks to a dory, ten dories to a schooner, and several hundred ships in the fleet. Groundfish had several million chances a day to die.
Pulling a third of a mile's worth of trawl off the ocean floor was backbreaking work, though, and unspeakably dangerous in bad weather. In November of 1880, two fishermen named Lee and Devine rowed out from the schooner Deep Water in their dory. November was a hell of a time to be on the Grand Banks in any kind of vessel, and in a dory it was sheer insanity. They took a wave broadside while hauling their trawl and both men were thrown into the water. Devine managed to clamber back into the boat, but Lee, weighed down by boots and winter clothing, started to sink. He was several fathoms under when his hand touched the trawl line that led back up to the surface. He started to pull.
Almost immediately his right hand sunk into a hook. He jerked it away, leaving part of his finger on the barbed steel like a piece of herringbait, and kept pulling upwards towards the light. He finally broke the surface and heaved himself back into the dory. It was almost awash and Devine, who was bailing like mad, could do nothing to help him. Lee passed out from the pain and when he came to, he grabbed a bucket and started bailing as well. They had to empty the boat before they were hit by another freak wave. Twenty minutes later they were out of danger and Devine asked Lee if he needed to go back to the schooner. Lee shook his head and said that they should finish hauling the trawls. For the next hour he pulled gear out of the water with his mangled hand. That was dory fishing in its heyday.