New moon springs sharpen the 20-fathom break — bluefin show on the Coimbra corridor

Last week's blow did what blows do out here — it stirred the pot and left something better behind. We had a hard NE push mid-week that a lot of guys grumbled about, but by Wednesday and Thursday the shelf-slope edge had opened up to a 10.3-degree differential, which is about as wide as I've seen it set up all season. That kind of thermal break doesn't happen by accident — it's the cold shelf water shouldering up against the warm slope current, and where those two masses collide, bait piles up and yellowfin follow. Guys working the seam between Wilmington and Poor Man's, and the east wall of the Hudson, connected on some quality yellowfin in that window. If you missed it, don't lose sleep — that setup tends to rebuild after a blow, and I wouldn't be shocked to see it again before the week's out.

This week the moon is the story closer to the beach. We're running into new moon springs, with the tide building toward peak alignment Saturday through Monday. Bigger swings, stronger current, and that NE upwelling we had last week has left the 20 to 30 fathom breaks sharper than they've been in a month. That's exactly the kind of structure bluefin like to sit on when they're staging inshore of the canyons — they'll hold on the edge of a temperature break and let the current bring the bait to them instead of chasing it across open water. The Coimbra corridor at 20 fathoms has been the one to watch, and with the moon going dark, the overnight squid-light bite there is lining up about as well as it's going to.

On the wrecks and reefs, it's been a steady grind rather than a blowup, which is fine by me — that's the nature of bottom fishing in July. Sea bass are stacked on the Triple Wrecks and Axel Carlson Reef in 60 to 90 feet, and the jumbos are still coming out of the deeper structure on Barnegat Ridge, particularly the high-relief pieces where the current sweeps hard on the last two hours of the ebb. Standard program: high-low rigs with squid strips and green crab, or if you want to be efficient about it, a 4-ounce diamond jig tipped with a Gulp Grub in nuclear chicken worked right off the bottom. Sea Girt Reef has been kicking out mixed bags — good sea bass with a scattering of small blackfish mixed in, which tells me the tog are starting to think about moving onto structure ahead of the fall push, even though it's early for them yet.

Bonito is the wildcard this week. The corridor's been widening to our north as that cold wall up in Rhode Island Sound broke down, and the early reports out of the eastern Long Island inlets on clean incoming water have me watching Shrewsbury Rocks and the water off Sea Girt for the first stray fish to show. I haven't had a confirmed bonito in the box yet out of our zone, so I'm not going to tell you to run out and target them — but if you're already anchored on a wreck for sea bass and you see showers of bait getting nervous on top, it wouldn't hurt to have a small metal rigged and ready.

Mahi are still mostly a rumor this far into July. I know guys are itching for the pot bite to load up, but the water hasn't stacked the way it does in late summer — I'd call this the scouting phase, not the stacking phase. If you're running past floating structure on the way to the tuna grounds, throw a look and maybe a naked ballyhoo, but I wouldn't plan a whole trip around it yet. That bite typically doesn't turn on for us until the back half of the month, and this year's shaping up on the normal calendar.

For the midrange tuna guys, my numbers say the Klondike and the deeper edge of the Mud Hole are worth a look this week too — not because the bluefin have set up thick there yet, but because the same NE upwelling that sharpened the Coimbra break has been working the whole shelf edge, and bait's been getting pushed onto structure across a wider stretch than usual. I had one report of school bluefin working bait pods on the northern lump of the Mud Hole in 55 feet, taken on trolled spreader bars mid-morning — not a stacked bite, but a real one, and worth a troll pass if you're already out that way.

Looking ahead, I'm watching two things. First, that shelf-slope edge — if it holds together like it did Wednesday and Thursday, I expect another crack at yellowfin on the same seam by midweek, and it's worth the run if the forecast stays clean. Second, the springs building through the weekend mean stronger current on the wrecks, which usually pushes sea bass tight to structure and makes the drift fishing sloppy — I'd favor anchoring up on the last two hours of tide rather than drifting through it. And keep an ear out on white marlin — the warm plume that's been building toward the bank is the trigger everybody's watching, and if the pattern holds, we could see the first flags at the canyons within the week. That's a bit outside my usual water, but when it starts, the whole fleet notices.