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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.

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Common name: False Grunion

Taxonomy: available through www.itis.gov

Identification: Fischer et al. (1995a) reported as Colpichthys regis by Walker (1961) and Dill and Cordone (1997). This is the current valid name.  Other names include Atherinops regius (W. Eschmeyer, personal communication). Another spelling is Atherinops regis.

Native Range: Marine; Gulf of California (Fischer et al. 1995a).

Interactive maps: Point Distribution Maps

Means of Introduction: Intentionally stocked as forage on five different occasions. Stock was obtained from San Felipe, Mexico (Walker et al. 1961).

Status: The introduction failed to produced a viable population and the species is extirpated from the Salton Sea.

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.

References: (click for full references)

Dill, W. A., and A. J. Cordone. 1997. History and status of introduced fishes in California, 1871--1996. Manuscript for Fish Bulletin of the California Department of Fish and Game 178.

Fischer, W., F. Krupp, W. Schneider, C. Sommer, K. E. Carpenter, V. H. Niem. 1995a. Guía FAO para la identificatión de especies para los fines de la pesca. Pacifico centro-oriental. Volumen II. Vertebrados - Parte 1. Vol. II: 647--1200. Roma, FAO.

Walker, B. W., R. R. Whitney, and G. W. Barlow. 1961. Fishes of the Salton Sea. Pages 77--92 in B. W. Walker, editor. The ecology of the Salton Sea, California, in relation to the sport fishery of California. Fish Bulletin of the California Department of Fish and Game 113.

Other Resources:

Author: Fuller, P.

Peer Review Date: 3/5/2011

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.