First checkTwo separate dorsal fins with a gap between them, a deep body flattened side to side, and bars rather than a stripe. That is a young perch; a darter is slender and nearly round.
The spiny-rayed cut is the most useful single division in freshwater forage. Minnows and herrings have one soft dorsal fin and no spines. Perch and sunfish have a spiny fin at the front. Everything else follows from that.Dispute
A young perch shows two dorsal fins with a clear gap between them, about seven broad dark bars down a brassy flank (faint on the smallest fish), and spines on the tip of the gill cover.CTDEEP-YELLOW-PERCH, DFO-YELLOW-PERCH-SYNOPSISDispute
It also changes address during its first season. Near-shore pelagic schools for the first thirty to forty days, then a move to the bottom. Where you meet one depends on how old it is.Dispute
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 Yellow perch, young of year
Fish-shaped forage silhouette (minnow / shiner / fry) — not an insect+6
Spiny front dorsal fin, separate from or joined to a soft second dorsal (perch, sunfish)+6
Dark vertical bars down the flank, not a horizontal stripe+5
Moving as a school or tight bait cluster, not as a single insect+4
Two dorsal fins with a clear gap between them+4
Deep-bodied and strongly flattened side to side+1
Argues against it
One soft dorsal fin only, with no spines (minnows, shads, herrings)-5
No pelvic fins on the underside at all-5
Sawtooth belly — a row of sharp scutes along the midline you can feel-4
Small fleshy fin between the dorsal fin and the tail-4
Last dorsal ray drawn out into a long trailing thread-4
Body long and thin, many times longer than it is deep-4
One dorsal fin running most of the length of the back-4
Rows of smaller spots trailing behind the shoulder spot-4
Head wide and flattened, wider than the body behind it-4
Sits on the bottom and darts — it does not hover-4
Dives into clean sand and disappears-4
Dark opercular flap (ear flap) at the rear corner of the gill cover-3
Blunt, flattened head with a small mouth at the front-3
Tail fin rounded or squared off, not forked-3
Big fan-shaped side fins the fish props itself on-3
Dark spot just behind the upper edge of the gill cover-2
Body translucent — light passes through it, and the backbone or gut shows-2
Snout overhangs the mouth, its tip in front of the jaw-2
Rounded, cigar-shaped body — not slab-sided-1
Eye diameter greater than the length of the snout-1
Mouth angled upward, the lower jaw leading-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 →
Near-shore pelagic schools early, then littoral bottom. Adults hold farther out than the young.Dispute
How it moves
Schools sorted by size and age; feeds in daylight, inactive at night.Dispute
Cues this stage offers the comparison
Fish-shaped forage silhouette (minnow / shiner / fry) — not an insect
Spiny front dorsal fin, separate from or joined to a soft second dorsal (perch, sunfish)
Dark vertical bars down the flank, not a horizontal stripe
Moving as a school or tight bait cluster, not as a single insect
Confused with
Telling it from what it isn't.
Yellow perch, young of yearvsSunfish, young of year
A dark ear flap at the corner of the gill cover, and a much deeper rounder body, is a young sunfish. Perch has neither, and has gill-cover spines that sunfish lack.
Where in the column it mattersNear the bottom. The one group here that changes column during its first season: near-shore pelagic schools for the first thirty to forty days, then a shift to the bottom. Where you meet a young perch depends on how old it is.
Read from the record's own position notes: near-shore pelagic schools for the first 30 to 40 days after hatching; then a shift to the bottom as littoral bottom dwellers; schools of young fish stay near shore while adults are farther out.
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
Spring spawn, then shallowsyoung-of-year
JFMAMJJASOND
Yellow perch spawn in early spring once the water is in the mid-forties to low fifties. The young spend their first month or so in near-shore open-water schools, then settle to the bottom in the shallows for the rest of the summer. The temperature band is for the spawn, not a claim that every shallow holds them.
Observed: Spawning temperature from Canadian literature (Scott and Crossman); months from Connecticut (March-April) and British Columbia (April-May). Timing shifts with ice-out.
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.
8 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 reviewerAgency surveys in Lakes Michigan and Erie put age-0 yellow perch at roughly 60–80 mm total length by late summer and autumn. Earlier in the season they are far smaller.WIDNR-YOY-PERCH-SURVEY, GLFC-ERIE-FORAGE-TASK-GROUPEvidence from: Lakes Michigan and ErieDispute
Declared by the reviewerNo source consulted gave a school size specific to young-of-year perch — only 50 to 200 fish for perch schools generally.Dispute
Declared by the reviewerConnecticut DEEP compares the families directly on one character: sunfish lack the gill-cover spines perches carry. The rest of the separation is assembled from family characters.CTDEEP-SUNFISHESDispute
Declared by the reviewerAgency surveys in Lakes Michigan and Erie put age-0 yellow perch at roughly 60 to 80 mm total length by late summer and autumn; earlier in the season they are much smaller, hatching at about 5 mm.WIDNR-YOY-PERCH-SURVEY, GLFC-ERIE-FORAGE-TASK-GROUP, DFO-YELLOW-PERCH-SYNOPSISEvidence from: Lake Michigan (WI, micromesh gill net, 2017) and Lake Erie (trawls, 2023)Dispute
Declared by the reviewerNo source consulted gave a school size specific to young-of-year perch, only 50 to 200 fish for perch schools in general.DFO-YELLOW-PERCH-SYNOPSISDispute
Declared by the reviewerConnecticut DEEP compares the two families directly on one character: sunfish lack the opercular spines perches carry. The rest of the young-perch versus young-sunfish separation is assembled from family characters, and no source describes the young fish side by side.CTDEEP-SUNFISHESDispute
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 9 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.
Engbretson Underwater Photography. Unedited underwater footage: the spiny front dorsal raising, and the vertical bars breaking up against cover.
Working biologist · external video · title read back from the publisher 2026-09-09
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Which fish in this kind of water are documented eating this class of forage, and how they behave when they are.
What this forage class asks of the setup — the weight it wants, and where the chain gives first.
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