Everyone knows the shoulder spot. The shoulder spot is not the answer.
First checkFind the shoulder spot, then look BEHIND it. Rows of smaller spots trailing back is menhaden. A single spot on its own settles nothing.
A menhaden is a deep, slab-sided, oily fish with a head about a third of its body, swimming with its mouth open and straining plankton through a basket of gill rakers. In a school they ripple and splash at the surface, and when something is under them the young ones get corralled tight to the shoreline in what Massachusetts calls, in an official publication, a blitz. That is the animal most of the coast is actually fishing over.
Now the correction. Everyone identifies a peanut bunker by the dark spot behind the gill cover, and the spot is real — but so is the one on an alewife, and so is the one on a blueback herring, and alewife has belly scutes too. The shoulder spot does not separate a menhaden from a young river herring, and repeating that it does is how a whole coast keeps getting it wrong. What the sources actually separate on is what comes AFTER the spot: a row, sometimes several rows, of smaller spots trailing back along the flank. Up to six lines of them.
Carry the caveat with the character, though. Those rows are described as a varying number and as usually present — not always, and least of all on a small fish. If they are absent you have not ruled menhaden out. You have run out of characters, which is a different and more honest place to stand.
The tell
What settles it, and what settles against it.
Read off this record's own diagnostic weights, heaviest first. A structure near the top of the left column does most of the work on its own; one near the bottom only leans.
Argues for Menhaden (bunker, pogy)
Rows of smaller spots trailing behind the shoulder spot+7
Fish-shaped forage silhouette (minnow / shiner / fry) — not an insect+6
Sawtooth belly — a row of sharp scutes along the midline you can feel+6
Moving as a school or tight bait cluster, not as a single insect+5
Deep-bodied and strongly flattened side to side+5
One soft dorsal fin only, with no spines (minnows, shads, herrings)+3
Dark spot just behind the upper edge of the gill cover+2
Mouth angled upward, the lower jaw leading+2
Argues against it
Two dorsal fins with a clear gap between them-6
One dorsal fin running most of the length of the back-5
No pelvic fins on the underside at all-5
Body long and thin, many times longer than it is deep-5
Spiny front dorsal fin, separate from or joined to a soft second dorsal (perch, sunfish)-5
Tail fin rounded or squared off, not forked-5
Dives into clean sand and disappears-4
Rounded, cigar-shaped body — not slab-sided-4
Small fleshy fin between the dorsal fin and the tail-4
Dark opercular flap (ear flap) at the rear corner of the gill cover-4
Body translucent — light passes through it, and the backbone or gut shows-4
Snout overhangs the mouth, its tip in front of the jaw-4
Blunt, flattened head with a small mouth at the front-4
Head wide and flattened, wider than the body behind it-4
Big fan-shaped side fins the fish props itself on-4
Sits on the bottom and darts — it does not hover-4
Last dorsal ray drawn out into a long trailing thread-3
Dark vertical bars down the flank, not a horizontal stripe-3
Eye diameter greater than the length of the snout-2
A structure at −4 or below is treated as a hard exclusion by the comparison tool rather than as a penalty: if you saw it, this group is ruled out and no amount of matching elsewhere brings it back. Run a comparison →
Life stages
What it looks like, stage by stage.
Menhaden (bunker, pogy) — First yeardrawn
First yearthe stage a fish meets
Size in hand30–150 mm; the NOAA staging runs larva under 30, prejuvenile 30–38, juvenile above 38
What you see
Already deep-bodied: body depth increases sharply between 30 and 38 mm with almost no increase in length
The shoulder spot, with or without the trailing rows
Sharp scutes along the belly midline
Where it turns up
Inside estuaries and tidal rivers, where young fish spend most of a first year before joining the southward movement in late autumn.
How it moves
In dense schools that ripple or splash at the surface, and get pushed tight to the bank when something is on them.
Cues this stage offers the comparison
Sawtooth belly — a row of sharp scutes along the midline you can feel
Dark spot just behind the upper edge of the gill cover
Deep-bodied and strongly flattened side to side
Fish-shaped forage silhouette (minnow / shiner / fry) — not an insect
Moving as a school or tight bait cluster, not as a single insect
Menhaden (bunker, pogy) — Full-growndrawn
Full-grown
Size in hand152–500 mm depending which source you read — see the limitations
What you see
Thirty to thirty-five sharp belly scutes forming a distinct sawtooth keel
A dark shoulder spot, followed by up to six irregular rows of smaller spots
One short triangular dorsal at about the middle of the back
Deeply forked tail, lower lobe slightly the longer
Large mouth with a projecting lower jaw reaching at least under the back of the eye
Where it turns up
Inshore and estuarine water through the warm months, in very large compact schools at or just under the surface.
How it moves
Swims with its mouth open, filtering. Schools move in synchrony and are described as stratifying by size along the coast, with the larger fish farther north in summer.
Cues this stage offers the comparison
Rows of smaller spots trailing behind the shoulder spot
Sawtooth belly — a row of sharp scutes along the midline you can feel
Dark spot just behind the upper edge of the gill cover
Deep-bodied and strongly flattened side to side
Fish-shaped forage silhouette (minnow / shiner / fry) — not an insect
Moving as a school or tight bait cluster, not as a single insect
Confused with
Telling it from what it isn't.
Menhaden (bunker, pogy)vsSilversides
Two dorsals and a bright thick side band is a silverside. Menhaden have one dorsal at midbody and no side band in any source consulted.
This is the hard one and it is not settled by the spot. Alewife has a shoulder spot AND belly scutes. Look for the trailing rows of smaller spots, and for menhaden's much larger head — about a third of the body without the tail.
These groups name Menhaden (bunker, pogy) in their own separators. If you arrived holding one of them and were not sure, this is the sentence that pointed you over.
Sand lance (sand eel)said
Run a finger up the belly. Sharp scutes forming a sawtooth keel is a clupeid; a sand lance has only a soft fold of skin there.
One dorsal, a sawtooth belly and a shoulder spot is menhaden. No consulted source makes this comparison directly — it is assembled character by character, and is flagged as such.
Where in the column it mattersJust under the surface. A surface animal, and one of the few in this reference whose position is visible from a long way off — the school itself ripples the surface.
Read from the record's own position notes: very large, tightly packed schools at or just under the surface; estuaries and tidal creeks in the warm months.
Reference windows
When this group is typically available.
Typical published ranges only. Elevation, latitude, tailwater release and a given year's weather move all of these, often by weeks. This is never a statement about today.
1 reference window
Inshore seasonadult
JFMAMJJASOND
Menhaden arrive inshore as the water warms and withdraw southward in autumn. Some contingents do not migrate at all and stay resident, so this window is not the same thing as presence inside it or absence outside it.
No reviewed dossier names this group. That is an absence in the dossier layer rather than a finding about the animal — four dossiers exist and only one of them names any forage group at all.
Nothing in the pattern layer is mapped to this group, so no presentation family follows from it here.
Not known
What this entry cannot tell you.
14 of them. The limits are part of what was reviewed rather than a disclaimer bolted on afterwards. An entry that hid them would be claiming more than it checked.
Written by the reviewer
Declared by the reviewerAdult size is stated five incompatible ways across five agencies, one of them exceeding another's stated maximum.
Declared by the reviewer“Peanut bunker” has no sourced length. Massachusetts ties it to young-of-year fish and gives no measurement.
Declared by the reviewerNo consulted source separates Atlantic from Gulf menhaden by any character; the distinction in the literature is geographic.
Declared by the reviewerSouth of New Jersey, Atlantic herring is described as increasingly scarce — which is the only sourced discriminator available against that species, and it is a map rather than a character.
Declared by the reviewerAdult size is stated five incompatible ways across NOAA, Maine, Connecticut, the Chesapeake Bay Program and VIMS, one of them exceeding another's stated maximum. The band here spans them rather than picking one.
Declared by the reviewer“Peanut bunker” has no sourced length. Massachusetts ties the term to young-of-year fish and gives no measurement; the only sourced juvenile thresholds are a NOAA developmental staging — larva under 30 mm, prejuvenile 30 to 38 mm, juvenile above 38 mm.
Declared by the reviewerNo consulted source separates Atlantic from Gulf menhaden by any character. The distinction in the literature is geographic.
Declared by the reviewerNo source consulted states whether an adipose fin is present, or gives an eye-to-snout proportion for Brevoortia.
Declared by the reviewerThe rows of smaller spots are described as a varying number, and up to six — they are not guaranteed present, least of all on a small fish.
Sources disagreeMigration is framed two ways. NOAA states that while many menhaden are migratory, others stay resident; the interstate commission describes a coastwide autumn migration of all sizes and ages south around the North Carolina capes.
Sources disagreeSpawning season conflicts: an October to March South Atlantic peak in the commission's account, against a two-mode pattern in VIMS — spring spawners in northern waters and autumn spawners from Long Island to North Carolina.
Sources disagreePelvic ray counts are published differently: seven rays in Connecticut's description, six branched rays in VIMS'. The two are reconcilable but are not stated the same way.
Read off the record
Nobody typed these. They are fields that are empty, said out loud rather than left for you to notice from a section that simply is not there.
PatternsNo fly pattern in the pattern layer is mapped to this group. Whether anything imitates it is not answered here.
What eats itNo reviewed species dossier names this group. Some dossiers describe forage in class terms — small forage, insects, bait — and those are shown below, but a class description is not a reviewed link to this group and none is claimed.
Sources
Everything above rests on 13 published pages.
Attribution here is to the whole record, not to individual sentences — the carrier attaches a source set to a record and does not say which page carried which line. Naming one per claim would mean inventing a mapping nobody reviewed.
A plate shows shape. It cannot show a gill beating, a mask firing, or an animal reversing into sand — so where motion is the field mark, the entry points at motion. These are demonstrations, selected by hand and by publisher. Nothing here is a source: it changes no score, no window and no reviewed claim.
My Fishing Cape Cod. A bunker school filter-feeding with mouths gaping. Slow, open-mouthed grazing is not how any other fish in this guide moves.
Specialist angling channel · external video · title read back from the publisher 2026-09-09
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