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.

Paramisgurnus dabryanus
Paramisgurnus dabryanus
(Large scale loach)

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Paramisgurnus dabryanus Dabry de Thiersant, 1872

Common name: Large scale loach

Synonyms and Other Names: Paramisgurnus dabryanus Sauvage, 1878; Misgurnus mizolepis Günther, 1888; Misgurnus oligolepos Chen, Shen & Li, 1994.

Taxonomy: available through www.itis.govITIS logo

Identification: Paramisgurnus dabryanus is distinct from all North American native freshwater fishes. Paramisgurnus dabryanus can be distinguished from Misgurnus anguillicaudatus (another loach popular in the aquarium trade) by the size of the crests on the caudal peduncle (high vs. low in M. anguillicaudatus), shape of the lamina circularis (bony process or scale at the base of the first and second pectoral fin rays), and lack of dark spot at the upper portion of caudal fin base (vs. presence in M. anguillicaudatus; Kottelat and Freyhof, 2002)

Native Range: China (Nichols, 1943; Kottelat, 2012)

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

Nonindigenous Occurrences:

Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Paramisgurnus dabryanus are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
CA201420141Middle San Joaquin-Lower Chowchilla

Table last updated 6/13/2021

† Populations may not be currently present.

Means of Introduction: Probable aquarium release.

Status: Unknown.

Remarks: Due to recent synonymy (Kottelat, 2012), collection records for Misgurnus mizolepis in the U.S. may be either P. dabryanus or M. anguillicaudatus.

References: (click for full references)

Kottelat, M. 2012. Conspectus Cobitidum: an inventory of the loaches of the world (Teleostei: Cypriniformes: Cobitoidei). The Raffles Bulletin of Zoology Supplement 26:1-199.

Kottelat, M., and J. Freyhof. 2007. Handbook of European freshwater fishes. Publications Kottelat, Cornol, Switzerland.

Nichols, J. T. 1943. The freshwater fishes of China. Natural history of Central Asia volume IX. The American Museum of Natural History, New York, NY.

FishBase Summary

Author: Neilson, M.E.

Revision Date: 5/20/2019

Citation Information:
Neilson, M.E., 2021, Paramisgurnus dabryanus Dabry de Thiersant, 1872: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2934, Revision Date: 5/20/2019, Access Date: 6/15/2021

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.


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2021]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/15/2021].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted. For queries involving fish, please contact Matthew Neilson. For queries involving invertebrates, contact Amy Benson.