Massachusetts state waters, out to 3 miles
Cannot be possessed if tunas, billfish, or swordfish are aboard.
MA DMF 2026 · checked · the official rulebook is the final word
Often mistaken for
Scalloped hammerheadNotched, wavy hammer edge. Tell them apart
Great hammerheadNearly straight hammer, tall sickle dorsal. Tell them apartKeep the wrong fish and its rule applies.
How to tell it
The hammer's front edge is smoothly curved with NO center notch — the scalloped's is scalloped. More on the smooth hammerhead page: every state’s rule, the records, and how anglers catch it.
Questions anglers ask4
What is the size limit for smooth hammerhead in Massachusetts?
78" min. Measured as fork length: snout to the fork of the tail.
How many smooth hammerhead can you keep in Massachusetts?
1 shark per trip (aggregate). Counts toward the Sharks (1 per trip) aggregate.
When is smooth hammerhead season in Massachusetts?
Open year-round.
How current is this Massachusetts smooth hammerhead rule?
Source: MA DMF 2026, last checked Sep 7, 2026. A watchman re-reads the agency's pages nightly. Rules change mid-season by proclamation; the official rulebook is the final word.
In the appPoint the camera at a smooth hammerhead in Massachusetts and this rule is on the screen before you take the picture. No signal needed.
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