Fluke and Sea Bass Grind On as Bonito Push Into the Inlets

What's biting

What's next

With the First Quarter moon set for tonight, expect moderate tidal swings through the next few days rather than the stronger flows that come around the full and new moon phases — a manageable window for working inlet structure and back-bay drifts without fighting hard current. Capt Ron's reports of a sharp overnight temperature drop (9 degrees to 67) earlier this week suggest the bay is still bouncing around rather than settling into a stable late-summer pattern, so anglers should expect some day-to-day variability in where the fluke stack up.

If the current trend holds, look for sea bass to stay the more dependable box-filler over the next 2-3 days — Blue Chip's "red hot" trips suggest that bite is not showing signs of slowing, and it tends to be less weather-sensitive than fluke once fish are located on structure. Fluke fishing should keep rewarding anglers willing to move: Capt Ron's pattern of working several drifts before finding quality fish, and OTW's "hot and cold" characterization from the rivers to the reefs, both point to a bite that rewards mobility over anchoring on one spot.

The Spanish mackerel and bonito showing per Grumpys and OTW are the trend to watch heading into the weekend. Both species typically build in numbers through late August as water stays warm, so anglers working epoxy jigs along beaches, inlets, and current lines should see more consistent shots as the week progresses rather than fewer. This is also a good window to start rigging for that bite specifically if you haven't already, since Grumpys is already restocking jig inventory in response to demand.

Striped bass activity around structure like the Shark River inlet, per NJ Fish & Wildlife, should stay steady rather than surge in the next few days. The more significant striper push associated with the fall migration is a September-into-October story for this region, so treat any bass now as a bonus rather than the main target. Anglers planning trips this weekend should prioritize morning drifts for fluke and sea bass, then pivot to jigging structure and current edges later in the day as water warms for a shot at mackerel or bonito.

Context

Late August in Raritan Bay and around Sandy Hook is typically a transition stretch: summer flounder and black sea bass remain the bread-and-butter targets, warm-water visitors like Spanish mackerel and bonito start showing in better numbers along beaches and inlets, and striped bass activity is generally modest ahead of the more substantial fall migration that builds through September and October. What's being reported this week — steady fluke and "red hot" sea bass per Blue Chip Sportfishing, plus the Spanish mackerel and bonito arrival noted by both Grumpys Tackle and OTW's Northern New Jersey report — reads as consistent with that typical seasonal rhythm rather than notably early or late.

The angler-intel feeds don't offer a clear signal on how this year compares to prior seasons in raw numbers or timing; none of the available regional sources make a direct year-over-year comparison for the Raritan Bay and Sandy Hook stretch specifically. The overnight 9-degree temperature swing Capt Ron logged is a reminder that local conditions can shift quickly this time of year even without a major weather event, which is typical for the shoulder period between full summer heat and the first cooling trends of early fall.

Anglers should check current NJ size and possession limits before harvesting fluke, sea bass, or striped bass, since regulations can be adjusted mid-season.