Blunt head, small mouth, two back fins, and a habit of leaving the water for no reason anyone can prove.
First checkLook at the head end. Blunt, flat, and a small mouth at the very front, with two widely separated back fins behind it — mullet.
Mullet are the one fish in this wave that everybody has watched and almost nobody has looked at. They jump — sometimes a metre clear — and four different agencies give four different explanations for why. To evade predators. To clean the gills. To get oxygen out of warm stagnant water. And, from Connecticut, with admirable directness: for unclear reasons. Four sourced answers and no settled one is a perfectly good thing for a field guide to say.
What you can settle is the fish. A mullet is rounded and stout and silvery with a blunt, flattened head and a small mouth right at the front — and, seen from underneath, that mouth reads as an inverted V. Two dorsal fins set well apart, the first carrying four spines. Short pectoral fins high on the flank. A thick adipose eyelid over part of the eye, which one North Carolina document notes becomes visible to the naked eye at about 42 mm, which is exactly the size you are most likely to be holding one.
The stripes come late. Below about six inches a striped mullet may show none at all, and that is where the honest trouble starts: a striped and a white mullet at that size are separated by counting eight anal rays against nine, by a gold spot on the gill cover of a living white mullet that fades fast after capture, and by whether scales run onto the second dorsal and anal fins. Those are real, sourced characters. None of them is easy in a rip with wet hands.
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 Mullet (young)
Blunt, flattened head with a small mouth at the front+7
Fish-shaped forage silhouette (minnow / shiner / fry) — not an insect+6
Two dorsal fins with a clear gap between them+6
Moving as a school or tight bait cluster, not as a single insect+5
Rounded, cigar-shaped body — not slab-sided+3
Spiny front dorsal fin, separate from or joined to a soft second dorsal (perch, sunfish)+2
Head wide and flattened, wider than the body behind it+1
Argues against it
One dorsal fin running most of the length of the back-5
No pelvic fins on the underside at all-5
Mouth angled upward, the lower jaw leading-4
Body long and thin, many times longer than it is deep-4
Dives into clean sand and disappears-4
Sawtooth belly — a row of sharp scutes along the midline you can feel-4
Last dorsal ray drawn out into a long trailing thread-4
Rows of smaller spots trailing behind the shoulder spot-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
Tail fin rounded or squared off, not forked-4
One soft dorsal fin only, with no spines (minnows, shads, herrings)-3
Snout overhangs the mouth, its tip in front of the jaw-3
Dark spot just behind the upper edge of the gill cover-3
Dark vertical bars down the flank, not a horizontal stripe-3
Big fan-shaped side fins the fish props itself on-3
Sits on the bottom and darts — it does not hover-3
Deep-bodied and strongly flattened side to side-2
Small fleshy fin between the dorsal fin and the tail-2
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.
Mullet (young) — First yeardrawn
First yearthe stage a fish meets
Size in hand15–178 mm; pre-juveniles enter estuaries at around 20–22 mm
What you see
The blunt head and small terminal mouth are already the giveaway
The adipose eyelid becomes visible to the naked eye by about 42 mm
Stripes are absent below about six inches, so their absence means nothing at this size
Where it turns up
Inshore into tidal creeks from about an inch long; beaches, flats, lagoons, bays and channels.
How it moves
Schooling; and jumping, which starts early.
Cues this stage offers the comparison
Blunt, flattened head with a small mouth at the front
Two dorsal fins with a clear gap between them
Fish-shaped forage silhouette (minnow / shiner / fry) — not an insect
Moving as a school or tight bait cluster, not as a single insect
Mullet (young) — Full-growndrawn
Full-grown
Size in hand330–698 mm in the North Carolina data; larger maxima published elsewhere
What you see
Two well-separated dorsal fins, the first with four spines
Blunt flattened head, small mouth, a bump at the tip of the lower lip
Seen from below, the mouth is an inverted V
Faint horizontal lines formed by a dark spot at the centre of each scale
Short pectoral fins set high on the body
Where it turns up
Huge surface schools over sand or mud, close to shore around river and stream mouths and in brackish bays and inlets.
How it moves
Feeds by sucking in bottom sediment and scraping at grass. Moves toward and along the coast in autumn — a movement two sources tie to north or northwest winds and cold fronts.
Cues this stage offers the comparison
Blunt, flattened head with a small mouth at the front
Two dorsal fins with a clear gap between them
Spiny front dorsal fin, separate from or joined to a soft second dorsal (perch, sunfish)
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.
Mullet (young)vsSilversides
Both carry two dorsals. Connecticut states the separation directly: a young mullet has fewer anal rays and the anal fin starts directly under the dorsal.
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. Schools near the surface but feeds on the bottom, so the fish is regularly in two bands for two different reasons.
Read from the record's own position notes: huge schools near the surface over sand or mud; close to shore around the mouths of streams and rivers, in brackish bays, inlets and lagoons.
What eats it
Which fish the dossiers actually name.
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 reviewerThe phrase “mullet run” is used by no source consulted, and neither is “finger mullet”. The autumn movement is real and sourced; the names are vernacular.
Declared by the reviewerTwo Florida sources contradict each other on where the second dorsal starts relative to the anal fin, so that character is not used.
Declared by the reviewerStripe onset is stated as after 40 mm by one source and as absent below about 150 mm by another. They cannot both describe the same transition.
Declared by the reviewerNo source consulted states whether mullet have belly scutes, a keel or an adipose fin, or names the family.
Declared by the reviewerBelow about six inches, striped and white mullet are genuinely hard to separate. The sourced characters are eight versus nine soft anal rays, a gold spot on the gill cover of a living white mullet that fades fast after capture, and scales extending onto the second dorsal and anal fins of white mullet only.
Declared by the reviewerThe phrase “mullet run” is used by no source consulted. The autumn movement is real and sourced; the name is vernacular. So is “finger mullet”, which appears in no consulted source.
Declared by the reviewerWhy mullet jump has four different sourced explanations and no settled one. Connecticut's page says flatly: for unclear reasons.
Declared by the reviewerStripe onset is stated two ways — evident after 40 mm in one source, absent below about 150 mm in another. They cannot both describe the same transition and no source reconciles them.
Declared by the reviewerNo source consulted states whether mullet have belly scutes, a keel, or an adipose fin, or names the family.
Sources disagreeTwo sources contradict each other on where the second dorsal fin starts relative to the anal fin — over its beginning in Florida's wildlife agency page, behind it in the Florida Museum's. This record does not use that character.
Sources disagreeMaximum size is published as 698 mm in North Carolina, 914 mm internationally, 1200 mm by the Florida Museum and 1194 mm by Connecticut. Different scopes, not blended here.
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.
SeasonalityNo reference window is published for this group, so this entry says nothing about when it is available. That is an absence in the calendar layer, not a claim that the animal has no season.
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 10 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.
Florida Sportsman. The run as an event — nervous water, surface skipping, predators on the edges. That is how mullet are recognised before a head is ever seen.
Specialist angling channel · external video · title read back from the publisher 2026-09-09
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