September 2026
Late September on Long Island Sound usually starts with easy fishing. You drop an Asian shore crab on a quarter-ounce jig next to the breakwall at Clinton or the rocks off Penfield Reef, and you have dinner in twenty minutes. By mid-October, those same rocks go quiet. Two sharp nor’easters blow through, the surface water drops below 60 degrees, and the blackfish slip off into 35 to 60 feet of water.
Here is an approach to help you catch Tautog throughout the fall season by tracking the water temperatures and focused depth ranges.
Water Temperature Dictates Depth
Water temperature drives blackfish depth throughout the fall. As coastal waters cool, fish stage in distinct depth zones:
- Early Fall (65°F to 68°F): Tautog hold shallow in 10 to 25 feet of water. Breakwalls, rocky points, and shallow harbor ledges offer crabs and mussels warmed by the afternoon sun.
- Mid-Fall Transition (58°F to 64°F): Fish shift out to mid-depth structure in 25 to 45 feet. Submerged humps, rip-rap along shipping channels, and moderate boulder piles hold the bulk of the population.
- Late Fall Migration (52°F to 57°F): Fish push into deep offshore structure in 45 to 75 feet. Tautog gather tightly around deep rock piles, wreck edges, and high-relief glacial erratics where bottom temperatures stay stable.
Structure and Sonar
Tautog stick to structure. If your boat swings fifteen feet off a rock pile, your crab sits in mud. You end up catching sea robins and dogfish while the boat anchored fifty yards away fills their tags.
Idle across the area at three knots before putting an anchor in the water. Watch your side-scan sonar for hard, bright returns and sharp shadows that mark the highest boulders. Waypoint the exact edge where boulder piles meet the flat bottom. That transition holds the feeding fish.
Anchoring with a Heading Sensor
Current on the Sound swings a boat through a wide arc on a single anchor. Because standard GPS only shows direction when moving, you 100% need a heading sensor to locate fish and hold position. A heading sensor shows the true orientation of your hull at rest, which lets you figure out where the stern will settle before you drop line.
Strong tidal current or crosswinds will pull a single anchor off the spot every fifteen minutes. Drop a primary bow anchor up-current, pay out line past the mark, set a second anchor off the stern quarter, and crank both lines tight. The hull stays locked directly above the rock.
Crab Baits
Crab choice changes as the water cools. If you collect your own, review our guide on how to catch and keep your own saltwater bait to keep them alive.
Whole Asian shore crabs fished on a light jig produce well in shallow water through early October. Once you move into 30 to 45 feet, green crabs take over. Cut them in half through the shell, twist off the walking legs so the bait sits flat in the current, and push the hook through a rear leg socket out through the knuckle.
In deep water late in the season, white-leggers draw bites when green crabs sit untouched. Crack the shell slightly with your thumb before dropping down so the scent leaks out quickly in cold water.
Jigs vs. Dropper Rigs
A light jig gives you direct contact with the bait. In water under 30 feet with gentle current, a three-quarter-ounce jig lets you feel the crab hit the rock. For jigging specifics, look at our article on catching trophy blackfish and tautog.
Heavy current in 50 feet of water sweeps a jig off the bottom. Switch to a dropper rig with four to eight ounces of bank sinker, fifty-pound fluorocarbon leader, and a sharp 4/0 beak hook. The lead stays planted on the rock face where the fish hide.
Timing the Hookset
Swinging on the first tap leaves you with an empty hook. Small bergalls or blackfish pecking at the shell make that quick rattle. Wait for the rod tip to pull down with steady, heavy weight as the fish walks the crab back to its throat teeth. Lift the rod in one long, smooth sweep and crank immediately to turn the fish’s head before it dives into a hole.
Frequently Asked Questions
What water temperature triggers the fall tautog transition?
When coastal water temperatures drop below 60 degrees, usually around mid-October in southern New England, blackfish leave shallow breakwalls and head for deeper rock piles in 35 to 60 feet of water.
What is the best crab bait for deep water blackfish?
Green crabs work across most depths, but white-legger crabs produce better once you get past 45 feet late in the fall because of their softer shell and stronger scent.
Should I use a jig or a rig in deep water?
Jigs work well in water under 30 feet with light current. In deeper water with heavy tidal flow, use a dropper rig with four to eight ounces of lead to keep the bait pinned to the bottom.
Summary
Track the temperature drop, anchor tight with two lines so your stern stays put, and switch to heavier dropper rigs as the fish move out into deep water.
The next step in the ThrillFishing Inshore Tactics series covers our custom jig-rig combinations and fine-tuning bait elasticity for heavy current.
Please send pictures of your fishing success. You can contact me by email at [email protected].
Tight lines … Captain P.