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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: Tule Perch

Taxonomy: available through www.itis.gov

Identification: Moyle (1976a); McGinnis (1984); Page and Burr (1991). Original spelling ends with ii (Nelson et al. 2004).

Size: 15 cm.

Native Range: Formerly in low-elevation waters of the Sacramento-San Joaquin River drainage, as well as Clear Lake, Coyote Creek, and the Russian, Napa, Pajaro, and Salinas rivers. Now apparently extirpated from the Pajaro, Salinas, and San Joaquin rivers (Moyle 1976a). Lee et al. (1980 et seq.) provided a dot distribution map for the species.

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: Presumably gained access to these areas via the California Aqueduct.

Status: Established in parts of California outside its native range (Moyle 1976a).

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: Moyle (1976a) noted that introductions involved what is considered by some to be a subspecies (i.e., H. t. Triassic).

References: (click for full references)

Nelson, J. S., E. J. Crossman, H. Espinosa-Perez, L. T. Findley, C. R. Gilbert, R. N. Lea and J. D. Williams. 2004. Common and Scientific Names of Fishes from the United States, Canada and Mexico, Sixth Edition. American Fisheries Society Special Publication 29. Bethesda, MD.

Other Resources:

Author: Pam Fuller, and Leo Nico

Peer Review Date: 10/8/2008

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.