Siphateles bicolor ssp. 14

Pit River Tui Chub

Family: Leuciscidae · Class: Actinopterygii · Order: Cypriniformes

Conservation status: G4T1T3 S1S3

The Pit River tui chub (Siphateles bicolor ssp. 14) is a subspecies of the widely distributed tui chub complex found in western North America. This freshwater fish belongs to the minnow family Leuciscidae and represents one of several geographically isolated subspecies that have evolved distinct characteristics in separate drainage systems. Like other tui chubs, the Pit River tui chub likely displays the typical body form of the species complex: a moderately deep, laterally compressed body with a small head and terminal mouth. Adults generally range from 100-300 mm (4-12 inches) in total length, though specific measurements for this subspecies have not been well documented. The body coloration typically includes olive to brownish tones on the dorsal surface with lighter silvery sides, though specific color patterns for this subspecies require further documentation. The Pit River tui chub is endemic to the Pit River drainage system in northeastern California. This drainage system flows through portions of Lassen, Modoc, and Shasta counties before joining the Sacramento River system. The subspecies has evolved in isolation within this specific hydrologic unit, developing unique genetic and morphological characteristics that distinguish it from other tui chub populations throughout the western United States. Tui chubs typically inhabit a variety of freshwater environments including lakes, ponds, springs, and slow-moving streams. They often prefer areas with aquatic vegetation and can tolerate a range of water temperatures and alkalinity levels. Specific habitat requirements for the Pit River subspecies have not been comprehensively studied, but the population likely occupies similar habitats to other tui chub subspecies, including both lentic and lotic environments within the Pit River system. Ecological information specific to the Pit River tui chub remains limited in the scientific literature. Tui chubs generally are omnivorous, feeding on algae, aquatic invertebrates, small crustaceans, and plant material. Spawning typically occurs in spring when water temperatures rise, with females depositing adhesive eggs in shallow areas with vegetation or rocky substrates. The species often forms schools and can serve as important forage fish for piscivorous birds and larger fish species. The Pit River tui chub has a conservation ranking of G4T1T3 S1S3, indicating that while the broader tui chub species is secure globally, this particular subspecies is critically imperiled to vulnerable at both global and state levels. The narrow geographic range and specific habitat requirements make this subspecies particularly vulnerable to environmental changes, habitat degradation, and competition from non-native species. Water diversions, habitat modifications, and introduced species represent potential threats to remaining populations. The limited distribution and apparent rarity of this subspecies highlight the need for targeted surveys and conservation assessment to better understand its current status and habitat requirements within the Pit River drainage system.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.