Hysterocarpus traskii Gibbons, 1854
Russian river tule perch
Hysterocarpus traskii
photo by The Native Fish Conservancy

Family:  Embiotocidae (Surfperches)
Max. size:  15 cm TL (male/unsexed); max. reported age: 5 years
Environment:  demersal; freshwater; brackish
Distribution:  North America: Clear Lake; Russian, Sacramento-San Joaquin, and Pajaro-Salinas River drainages in California, USA. Three subspecies were recognized: Hysterocarpus traskii lagunae in Clear Lake; Hysterocarpus traskii pomo in Russian River; and Hysterocarpus traskii traskii in rest of range.
Diagnosis:   
Biology:  Inhabits mud- to gravel-bottomed pools and runs of small to large, low-elevation rivers and lakes. Usually occurs near emergent aquatic plants or overhanging banks. Rarely enters brackish water (Ref. 86798). Viviparous, female carries the developing young (Ref. 205).
IUCN Red List Status: Least Concern (LC); Date assessed: 17 February 2012 Ref. (130435)
Threat to humans:  harmless


Source and more info: www.fishbase.org. For personal, classroom, and other internal use only. Not for publication.