Identity
Unique IDELEMENT_GLOBAL.2.104724
Element CodeAFCQB07010
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVertebrate Animal
IUCNEndangered
Endemicendemic to a single state or province
KingdomAnimalia
PhylumCraniata
ClassActinopterygii
OrderCentrarchiformes
FamilyCentrarchidae
GenusArchoplites
Concept ReferenceRobins, C.R., R.M. Bailey, C.E. Bond, J.R. Brooker, E.A. Lachner, R.N. Lea, and W.B. Scott. 1991. Common and scientific names of fishes from the United States and Canada. American Fisheries Society, Special Publication 20. 183 pp.
Taxonomic CommentsThe only living member of the genus; the most "primitive" living member of the Centrarchidae (Lee et al. 1980).
Conservation Status
Rank MethodExpertise without calculation
Review Date2011-10-20
Change Date2011-10-20
Edition Date2011-10-20
Edition AuthorsT. Hopkins, P. Moyle, and G. Hammerson
Threat ImpactVery high - medium
Range Extent1000-5000 square km (about 400-2000 square miles)
Number of Occurrences1 - 5
Rank ReasonsFormerly widely distributed and common in much of California; now restricted to just a couple remaining native populations in California, which are small but persistent; native habitat is dominated by introduced species, which threaten Sacramento perch through competition and predation; reasonably secure in several watersheds outside native range. Based on native populations, rank would be G1 (G2G3 if introduced populations are considered).
Range Extent CommentsThe Sacramento perch is only native centrarchid west of the Rocky Mountains. It was originally widely distributed throughout the Sacramento-San Joaquin drainage, in the Pajaro and Salinas rivers, and in Clear Lake (Lake County), California (Moyle 2002). Persisting native populations exist in Clear Lake (small population) and Alameda Creek (in gravel pit ponds adjacent to the creek and in Calaveras Reservoir) (Moyle 2002). However, the species has been introduced in other locations within the native range (often upstream of native habitats) (Moyle 2002), and in several areas outside the native range in California, including the upper Klamath basin (California and Oregon), Pit River watershed, Walker River watershed, Mono Lake watershed, and Owens River watershed; it may also persist in Sonoma Reservoir (Moyle 2002).
The species has been introduced and currently is established in Nevada (several drainages) and Utah (Garrison Reservoir) (Moyle 2002). Introduced populations in several other states apparently no longer exist (Moyle 2002).
Occurrences CommentsThis species is represented by only a couple remaining native populations, plus several introduced populations that may be reasonably secure (Moyle 2002). Most introduced pond and reservoir populations are not expected to persist over the long term because of changing conditions (Moyle 20020.
Threat Impact CommentsFormerly this fish was widespread and abundant in California, but the population declined rapidly probably due to factors such as habitat destruction, egg predation by non-native fishes, and interspecific competition with introduced centrarchids, especially black crappie; competition may be the most important cause of the decline (Moyle 1976, 2002). Most introduced populations are isolated and vulnerable to genetic bottlenecks and extirpation.