You can sponsor this page

Percopsis omiscomaycus  (Walbaum, 1792)

Add your observation in Fish Watcher
AquaMaps webservice down at the moment
Upload your photos and videos
Pictures | Google image
Image of Percopsis omiscomaycus (Trout-perch)
Percopsis omiscomaycus
Picture by The Native Fish Conservancy

Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Percopsiformes (Trout-perches, pirate perches and cavef) > Percopsidae (Trout-perches)
Etymology: Percopsis: Greek, perke = perch + Greek, opsis = appearance (Ref. 45335);  omiscomaycus: omiscomaycus which is probably an Algonkian Indian name that includes the root 'trout' (Ref. 1998).

Environment: milieu / climate zone / depth range / distribution range Ecology

Freshwater; demersal; depth range 10 - 61 m (Ref. 27547).   Temperate; 68°N - 37°N

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

North America: Atlantic and Arctic basins throughout most of Canada, and south to Potomac River drainage in Virginia, USA; Yukon River drainage in Yukon Territory and Alaska; Great Lakes and Mississippi River basins south to West Virginia, Kentucky, Illinois, Missouri, North Dakota and Montana in the USA.

Length at first maturity / Size / Weight / Age

Maturity: Lm ?, range 8 - 15.4 cm
Max length : 20.0 cm TL male/unsexed; (Ref. 5723); common length : 8.8 cm TL male/unsexed; (Ref. 12193); max. reported age: 4 years (Ref. 10348)

Short description Morphology | Morphometrics

Dorsal spines (total): 1 - 3; Dorsal soft rays (total): 9-11; Anal spines: 1; Anal soft rays: 5 - 9; Vertebrae: 33 - 36. Distinguished by the presence of an adipose fin; small weak spines in the dorsal and anal spines; rough ctenoid scales; and pectoral fins reaching well behind the bases of pelvic fins (Ref. 27547). Gill rakers short, stubby mounds with small teeth; lateral line nearly straight (Ref. 27547). Pale yellowish to silvery, often almost transparent; with a row of about 10 dark spots along midline of back, 10 or 11 spots along lateral line, and another row of spots high on sides above lateral line; fins transparent (Ref. 27547).

Biology     Glossary (e.g. epibenthic)

Occurs in lakes, deep flowing pools of creeks, and rivers (Ref. 5723). Usually found over sand (Ref. 5723). Moves into the shallows of lakes at night to feed and moves back to deeper water as dawn approaches (Ref. 1998). Feeds on insect larvae, amphipods and fishes (Ref. 1998). Important forage fish (Ref. 1998).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Spawning adults move inshore to shallow water or into shallow tributaries of lakes (Ref. 10348). Two or more males cluster with a single female near the surface. They press close to the female, often breaking the surface of the water, and eggs and milt are released (Ref. 27547). Some populations spawn exclusively at night (Ref. 10348), but others show no variation from daytime spawning (Ref. 10349). There is often, perhaps usually, heavy postspawning mortality (Ref. 27547).

Main reference Upload your references | References | Coordinator | Collaborators

Page, L.M. and B.M. Burr, 1991. A field guide to freshwater fishes of North America north of Mexico. Houghton Mifflin Company, Boston. 432 p. (Ref. 5723)

IUCN Red List Status (Ref. 115185)

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans


Human uses

Fisheries: of no interest; aquarium: public aquariums; bait: occasionally
FAO(Publication : search) | FishSource |

More information

FAO areas
Food items
Food consumption
Aquaculture profile
Allele frequencies
Mass conversion
Stamps, Coins Misc.
Swim. type
Gill area


Special reports

Download XML

Internet sources

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 1.0010   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00589 (0.00245 - 0.01413), b=3.12 (2.91 - 3.33), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
Trophic Level (Ref. 69278):  3.4   ±0.51 se; Based on food items.
Resilience (Ref. 69278):  Medium, minimum population doubling time 1.4 - 4.4 years (tm=2-3; tmax=4).
Prior r = 0.5, 2 SD range = 0.22 - 1.11, log(r) = -0.69, SD log(r) = 0.4, Based on: 1 K, 2 tgen, 1 tmax, 2 Fec records
Vulnerability (Ref. 59153):  Low vulnerability (25 of 100) .