Rhinichthys gabrielino

Santa Ana Speckled Dace

Family: Cyprinidae · Class: Actinopterygii · Order: Cypriniformes

Conservation status: Proposed Threatened · G5T1 S1

The Santa Ana speckled dace is a small freshwater fish in the cyprinid (minnow) family endemic to Southern California. Adults typically measure 40 to 70 mm (1.6 to 2.8 inches) in total length. The species exhibits the typical speckled dace body form with a streamlined, elongated profile and small scales. Coloration consists of a mottled pattern of dark spots and blotches over an olive-brown to gray background, providing effective camouflage against stream substrates. The species is genetically distinguishable from other speckled dace populations and was recently designated as its own species (USFWS 2024). Historically, the Santa Ana speckled dace occurred throughout river systems at the bases of the San Gabriel, San Bernardino, and San Jacinto Mountain ranges in Los Angeles, San Bernardino, and Riverside Counties, California. The species was found in the Santa Ana, San Jacinto, San Gabriel, and Los Angeles watersheds (USFWS 2024). According to NatureServe, the range has been severely reduced from an estimated historical extent of approximately 575,000 hectares to its current 144,000 hectares. The species now persists in relatively small and isolated populations, occurring mostly on federal lands managed by the U.S. Forest Service. Santa Ana speckled dace inhabit clear, cool streams and creek systems in mountainous terrain of Southern California. The species requires flowing freshwater habitats with rocky or gravelly substrates typical of headwater and mid-elevation stream reaches. These fish are adapted to the variable flow regimes characteristic of Mediterranean climate watersheds, where streams may experience seasonal flooding and low flows. As cyprinids, Santa Ana speckled dace are omnivorous, feeding primarily on aquatic invertebrates including insect larvae, small crustaceans, and algae scraped from substrate surfaces. The species exhibits typical speckled dace feeding behavior, foraging in riffles and shallow areas where current concentrates food items. Reproduction occurs during spring months when water temperatures and flows are optimal. Like other speckled dace, this species likely spawns over gravel substrates in stream riffles. The U.S. Fish and Wildlife Service proposed listing the Santa Ana speckled dace as threatened under the Endangered Species Act in August 2024, determining that critical habitat designation is not determinable at this time (USFWS 2024). The species faces multiple threats including habitat loss and fragmentation, water diversions, urbanization impacts, and climate change effects on stream flows. As one of the few remaining native freshwater fish species inhabiting Southern California, the Santa Ana speckled dace represents an important component of regional aquatic biodiversity. The species' persistence depends on maintaining adequate stream flows and water quality in the remaining suitable habitat areas, primarily within national forest boundaries where some protection from development pressures exists.

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