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.

Limnoithona sinensis
(Asian copepod)

Copyright Info
Limnoithona sinensis (Burckhardt 1912)

Common name: Asian copepod

Synonyms and Other Names: Oithona (Limnoithona) sinensis

Taxonomy: available through www.itis.govITIS logo

Identification: See Ferrari and Orsi (1984).

Native Range: Uncertain. It has only been collected in two other locations worldwide, the Yangtze River in China and the Amazon River in South America (Ferrari and Orsi 1984).

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 Limnoithona sinensis are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
CA197920054Lower Sacramento; San Francisco Bay; San Joaquin Delta; Suisun Bay
OR199019901Lower Columbia
WA199019901Lower Columbia

Table last updated 9/26/2023

† Populations may not be currently present.

References: (click for full references)

Ferrari, F.D., and J. Orsi. 1984. Oithona davisae, new species, and Limnoithona sinensis (Burkhardt, 1912) (Copepoda: Oithonidae) from the Sacramento-San Joaquin Estuary, California. Journal of Crustacean Biology 4(1):106-126.

Revision Date: 8/27/2015

Citation Information:
U.S. Geological Survey, 2023, Limnoithona sinensis (Burckhardt 1912): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=171, Revision Date: 8/27/2015, Access Date: 9/26/2023

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. [2023]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [9/26/2023].

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 general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.