A fish that solves the predator problem by becoming part of the beach.
First checkLook at the underside where the pelvic fins should be. If there is nothing there, on an eel-thin body with one dorsal running most of the back and a forked tail, that is a sand lance.
Most small silver fish deal with being eaten by schooling tighter and swimming faster. Sand lance took a different route: they dive into the seabed. Head first, at sixty to seventy-five degrees, wriggling until about a quarter buried, then settling to a shallower angle and stopping. A researcher with a stopwatch measured them leaving again at fifty to eighty centimetres a second and accelerating to a hundred and twenty within the first metre and a half off the bottom. That is not a fish hiding. That is a fish with an exit strategy.Dispute
Which is why the sand matters more than the fish does. They favour clean, coarse, well-washed sand or fine gravel and avoid mud and rock. Find that bottom and you have found the habitat; find mud and you probably have not, whatever else is swimming there. In the Gulf of Maine the schools sat from the surface down to about twenty metres, vertically compressed and bluntly linear, half to three-quarters of a body length apart when cruising and a quarter of a body length apart when something is coming.NOAA-MEYER-SANDLANCE, NOAA-BIZZARRO-PSLEvidence from: Gulf of Maine school observationsDispute
In the hand it is the easiest call in this whole wave, and the character is an absence. There are no pelvic fins. None. Butterfish and cutlassfish lack them too, but a butterfish is a deep oval and a cutlassfish has no tail fin. Add an eel-thin body, one dorsal fin running most of the back, a forked tail and a lower jaw that leads, and you are done.NOAA-ORR-AMMODYTES, STRI-P-TRIACANTHUS, STRI-T-LEPTURUSDispute
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 Sand lance (sand eel)
No pelvic fins on the underside at all+7
Fish-shaped forage silhouette (minnow / shiner / fry) — not an insect+6
Body long and thin, many times longer than it is deep+6
One dorsal fin running most of the length of the back+6
Dives into clean sand and disappears+6
Moving as a school or tight bait cluster, not as a single insect+4
One soft dorsal fin only, with no spines (minnows, shads, herrings)+2
Rounded, cigar-shaped body — not slab-sided+1
Mouth angled upward, the lower jaw leading+1
Argues against it
Two dorsal fins with a clear gap between them-5
Spiny front dorsal fin, separate from or joined to a soft second dorsal (perch, sunfish)-5
Sawtooth belly — a row of sharp scutes along the midline you can feel-5
Deep-bodied and strongly flattened side to side-5
Last dorsal ray drawn out into a long trailing thread-4
Dark opercular flap (ear flap) at the rear corner of the gill cover-4
Snout overhangs the mouth, its tip in front of the jaw-4
Tail fin rounded or squared off, not forked-4
Head wide and flattened, wider than the body behind it-4
Big fan-shaped side fins the fish props itself on-4
Dark spot just behind the upper edge of the gill cover-3
Rows of smaller spots trailing behind the shoulder spot-3
Dark vertical bars down the flank, not a horizontal stripe-3
Blunt, flattened head with a small mouth at the front-3
Small fleshy fin between the dorsal fin and the tail-2
Sits on the bottom and darts — it does not hover-2
Eye diameter greater than the length of the snout-1
Body translucent — light passes through it, and the backbone or gut shows-1
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.
Sand lance (sand eel) — Larva and first yeardrawn
Larva and first yearthe stage a fish meets
Size in hand4–60 mm through the larval periodNOAA-RICHARDS-SANDLANCEEvidence from: Cape Cod to Cape Hatteras, 1966 larval surveysDispute
What you see
Already the long thin body, ten to fifteen times longer than deepDispute
Larvae are in the water column through winter and spring rather than in the sandNOAA-SANDLANCE-SYNTHEvidence from: Northeast USADispute
Where it turns up
In a 1966 survey from Cape Cod to Cape Hatteras, larvae were most abundant in winter off the mouths of the principal estuaries; by mid-May they were gone, probably to coastal beaches, up into estuaries, or onto the bottom.NOAA-RICHARDS-SANDLANCEEvidence from: Continental shelf, Cape Cod to Cape Hatteras, 1966Dispute
How it moves
More abundant in night tows than in day tows in that same survey, the only larval day-night figure among the sources.NOAA-RICHARDS-SANDLANCEEvidence from: Cape Cod to Cape Hatteras, 1966Dispute
Cues this stage offers the comparison
Body long and thin, many times longer than it is deep
No pelvic fins on the underside at all
Fish-shaped forage silhouette (minnow / shiner / fry) — not an insect
Moving as a school or tight bait cluster, not as a single insect
Fine oblique lines along the flank, and a loose fold of skin along the belly edgeDispute
Where it turns up
Buried in clean coarse sand, or in the water column directly above it. American sand lance are usually in less than twenty metres and often in less than two; Northern sand lance mostly deeper than twenty.NOAA-SANDLANCE-SYNTHEvidence from: Northwest AtlanticDispute
How it moves
Dives into the sand and disappears; comes back out at a shallower angle and accelerates hard. Balls up rather than scattering when pressed.Dispute
Cues this stage offers the comparison
No pelvic fins on the underside at all
One dorsal fin running most of the length of the back
Body long and thin, many times longer than it is deep
Dives into clean sand and disappears
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.
Sand lance (sand eel)vsSilversides
Two dorsal fins with a gap between them is a silverside. A sand lance has one, and it runs most of the back.
Where in the column it mattersIn the substrate. The only forage animal in this reference that is in the bottom and in the upper column on the same afternoon. Which band it is in decides everything about how it can be met, and a fish leaving the sand reaches about 120 centimetres a second within a metre and a half.
Read from the record's own position notes: buried in clean coarse sand, or in the water column directly above it; dense schools from the surface down to about twenty metres.
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
Winter spawn on sandadult
JFMAMJJASOND
Sand lance in the Northwest Atlantic spawn in fall and winter on sandy bottoms; how long the season lasts is not known. They remain a nearshore forage fish outside that window; the seasonal event is the spawn, not their appearing.
Observed: Dated from the Northwest Atlantic. Pacific sand lance are a different animal.
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.
The pattern layer ties this group in Streamer. That is a correspondence between an imitation and an animal, worked out when the patterns were written. Whether a fish is on it today is a question this page cannot reach.
Surf Candy
Streamer
Hook2–6
A sand lance — long, thin, eel-like, no pelvic fins.
Fast strips through the wash, then a pause. They vanish into sand.
13 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 two Atlantic species are not separable by eye, and one synthesis reports that the standard DNA barcoding gene cannot split them either. This entry does not offer that call.Dispute
Declared by the reviewerDiel burial is contradicted between two agency sources — one says they burrow at night, a field study found more buried by day. No rule is offered.Dispute
Declared by the reviewerNothing consulted describes sand lance showering at the surface or being driven onto beaches, despite how often it is said.Dispute
Declared by the reviewerThe two Atlantic species cannot be reliably separated by eye. The NOAA synthesis reports that standard DNA barcoding has failed to split them, though one unpublished dataset suggests it can, and that the difference rests on distribution, maximum size, and plicae and vertebral counts. This record does not offer an American-versus-Northern call.NOAA-SANDLANCE-SYNTHEvidence from: Northwest AtlanticDispute
Declared by the reviewerSources disagree on typical size by a wide margin: USGS describes three to six inches while the NOAA synthesis gives maxima of 20 cm and 30 cm for the two species. Both are shown rather than averaged.USGS-SAND-LANCE, NOAA-SANDLANCE-SYNTHDispute
Declared by the reviewerNo source consulted describes sand lance showering at the surface or being pushed onto beaches by predators, despite how often that is said. This record makes no such claim.Dispute
Declared by the reviewerNo source consulted states whether an adipose fin is present. The NOAA systematic revision gives the snout as 23 to 30 per cent of head length and the eye as 11 to 20 per cent in the North Pacific species, so the eye is shorter than the snout.NOAA-ORR-AMMODYTESEvidence from: North Pacific Ammodytes speciesDispute
Declared by the reviewerMissing pelvic fins are not unique to sand lance. Atlantic butterfish and Atlantic cutlassfish lack them too. The butterfish is a deep oval about a third as deep as long, and the cutlassfish has no tail fin, so the eel-thin body and forked tail belong with the missing pelvics.STRI-P-TRIACANTHUS, STRI-T-LEPTURUS, NOAA-ORR-AMMODYTESEvidence from: Western Atlantic look-alikesDispute
Declared by the reviewerThe school depths here come from one Gulf of Maine slope. Northern sand lance offshore are mostly deeper than twenty metres, and Alaska gives Pacific sand lance as most common shallower than fifty metres but down to 275.NOAA-MEYER-SANDLANCE, NOAA-SANDLANCE-SYNTH, ADFG-SAND-LANCEDispute
Sources disagreeDiel burial runs both ways in the sources. Alaska Department of Fish and Game states Pacific sand lance feed and school by day and burrow at night, and USGS says the same of the Northwest Atlantic species; a NOAA Fishery Bulletin field study in the San Juan Channel, Washington, found substantially more buried during the day than at night, 119.8 per square metre against 47.7. Neither is offered here as the rule.
Sources disagreeThe Pacific species carries two names across agency sources: Ammodytes personatus in the NOAA systematic revision and on Washington's species page, Ammodytes hexapterus in Alaska's species account. Both travel with this record.
Sources disagreeMaximum size is stated two ways. The NOAA synthesis says Northern sand lance can grow to over 30 cm; the NOAA systematic revision gives the genus an elongate body up to 280 mm total length.
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.
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.
These are every page behind this entry. Where a reviewer traced a line above to the pages that carry it, that line names them itself, with where the evidence comes from when it is narrower than the whole entry. A line with no names beside it rests on this list as a whole: nobody has yet checked which page carried it, and naming one would be a mapping nobody made.
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.
SeaDoc Society. Thousands of sand lance erupting out of the sand they were buried in. The disappearing act is the animal.
Research institute · external video · title read back from the publisher 2026-09-09
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