Disclaimer:

The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

---

Common name: Splittail

Taxonomy: available through www.itis.gov

Identification: Moyle (1976a); McGinnis (1984); Page and Burr (1991).

Size: 44 cm.

Native Range: Historically throughout Sacramento-San Joaquin River drainage, California; native populations now restricted to San Francisco Bay Delta and lower Sacramento River (Page and Burr 1991).

Alaska	Hawaii	Puerto Rico & Virgin Islands	Guam Saipan

Native range data for this species provided in part by NatureServe

Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Means of Introduction: Possibly came in with aqueduct water (Swift et al. 1993).

Status: Reported from California outside of its native range (Swift et al. 1993).

Impact of Introduction: The impacts of this species are currently unknown, as no studies have been done to determine how it has affected ecosystems in the invaded range. The absence of data does not equate to lack of effects. It does, however, mean that research is required to evaluate effects before conclusions can be made.

Remarks: The Lake Silverwood specimen was not retained (Swift et al. 1993). Lee et al. (1980 et seq.) provided a dot distribution map, but the Lake Silverwood record is not shown. However, a single dot mapped is shown in west-central California (possibly representing a record from San Luis Reservoir, Merced County) that is outside the boundaries of what the authors identify as the "former range." However, it is not clear if the dot represents an introduction or a printing artifact. Lee et al. (1980 et seq.) gave no indication in text that the dot represents an introduced population.

Other Resources:

Author: Nico, L.

Peer Review Date: 12/5/2003

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.