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


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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:  Adults inhabit 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. They rarely enter brackish water (Ref. 86798). Viviparous, female carries the developing young (Ref. 205). Migratory behaviour is undetermined (Ref. 126106).
IUCN Red List Status: Least Concern (LC); Date assessed: 17 February 2012 Ref. (130435)
Threat to humans:  harmless


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