PROTECTION STATUS: Not listed
RANGE: Lost from 55 percent of its historic range in northwestern Arizona, southeastern Nevada and southwestern Utah; survives primarily in Utah
THREATS: Habitat loss and degradation due to water withdrawals, development, livestock grazing, pollution, drought, and climate change; competition and predation from nonnative fish
POPULATION TREND: The spinedace was once common but has declined drastically from historic levels of abundance. Remaining populations fluctuate based on the amount of water left in the river.