Jeffreys Ledge is a long, productive rise in the Gulf of Maine that runs northeast off Cape Ann toward the Isles of Shoals and New Hampshire. It stacks bait, herring and mackerel prominent among it, and holds bluefin (including genuine giants) along with a deep-rooted groundfishery for cod, haddock and pollock.
The ground
The ledge is a large piece of structure with plenty of edges and depth changes. As with any bank, the fish relate to bait and the productive edges, so cover the ledge until you find the life.
How to fish it
Troll the edges to find fish, jig marks, and chunk or live-bait for giants. The same structure is superb for bottom jigging if the tuna go quiet.
Tip Jeffreys is big, so let the bait and the birds narrow it down. Herring and mackerel marks stacked on an edge, with life around them, are worth far more than random trolling over a featureless stretch of the ledge.