Seabed map of a single canyon rewrites how a current feeds a fishery
High-resolution sonar showed a cold tongue of water that models had smeared into a blur — and that fishermen had been following without a name for it.
The canyon was not unknown. The detail was. A ridge the size of a city block turns the current, lifts nutrients, and holds a line of boats that skippers had treated as folklore.
The paper names the tongue and gives it a season. Managers said they would look at whether the existing closed area actually covers the rise, or only the map they had.
One skipper, shown the image, said: “That is where the birds sit.” The birds, it turns out, were the better instrument.
