Gila seminuda pop. 2

Taxonomy 
Scientific Name:Gila seminuda pop. 2
Common name:Virgin River chub (Muddy River pop.)
Rank and Status   
Global Rank:G1T1Q Native Status:Native
Subnational (State) Rank:S1 Endemic:No
US ESA Status:None Sand Dunes:No
NNHP Tracking Status:At-Risk List Wetland:Yes
Other Agency Status Status Last Updated Status Comments
Bureau of Land Management - Nevada Sensitive BLM Nevada Sensitive Species List dated 2017-10-01
State of Nevada Protected Sensitive Fish NAC 503.067
Nevada Wildlife Action Plan - 2012 Species of Conservation Priority
Distribution (NV Counties)

Status: Confident or certain

Clark
Summary Occurrence Data
Occurrence Count:9
Total Observed Area (hectares):Not Available
Maximum Known Elevation (m):521
Minimum Known Elevation (m):410
Links
Gila seminuda pop. 2 data at NatureServe
Gila seminuda pop. 2 photos and data at Encyclopedia of Life
Character Abstract
Identification Comments:
Subspecies Comments:
Food Habits:Virgin River chub are omnivorous showing considerable dietary shifts with age. They feed on debris and chironomids and other macroinvertebrates in the drift. Adults feed almost exclusively on algae and debris, up to 90% filamentous algae.
Phenology Comments:
Reproduction Comments:Eggs possibly may be laid in gravel or cobble substrates of pools or moderate velocity runs (Sublette et al. 1990). Spawns late spring to early summer. Eggs hatch in 4-7 days at 19° C (66° F).
Migration Mobility:
Habitat Comments:Virgin River chub are most often associated with deep runs or pool habitats of slow to moderate velocities, with large boulders or instream cover such as root snags. Larger adults are often collected in deeper pool habitats. Adults prefer temperatures that are approximately 24°C.
Ecology comments:Scoppettone et al. (1996), determined the downstream distribution of native fishes of the Muddy River and its five spring-fed tributaries (Warm Springs area). Approximately 15,600 Virgin River chub were determined to be in the Warm Springs area and up to 17.1 km downstream. More recent distribution and numbers are significantly reduced with chub absent from the Warm Springs area and rare below the Wells Siding Diversion (Scoppettone et al 1999; Shattuck et al 2012). Originally thought to be a separate subspecies, Muddy River chub have been identified as Virgin River chub through recent genetic analyses (USFWS 2008b).
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