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.

Hyphessobrycon eques
Hyphessobrycon eques
(serpae tetra)

Copyright Info
Hyphessobrycon eques (Steindachner, 1882)

Common name: serpae tetra

Synonyms and Other Names: H. callistus (Boulenger, 1900), H. serpae Durbin in Eigenmann, 1908; jewel tetra, red minor tetra, blood tetra.

Taxonomy: available through www.itis.govITIS logo

Identification: According to Géry (1977), the genus Hyphessobrycon contains approximately 65 species and needs systematic revision. Hyphessobrycon eques is a species complex and includes the junior synonym H. serpae (Weitzman and Palmer 1997). See Géry for an identification key and a color photograph. A color photograph was also published in Axelrod et al. (1985).

Size: 4 cm.

Native Range: Tropical America. Central Amazon basin and Guianas (Géry 1977).

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 Hyphessobrycon eques are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
FL198919891St. Andrew-St. Joseph Bays

Table last updated 5/20/2024

† Populations may not be currently present.

Means of Introduction: Likely aqarium release.

Status: Failed in Florida.

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: This is a well-known aquarium species. There are no known voucher specimens.

References: (click for full references)

Axelrod, H.R., W.E. Burgess, N. Pronek, and J.G. Walls. 1985. Dr. Axelrod's atlas of freshwater aquarium fishes. Tropical Fish Hobbyist Publications, Inc., Neptune City, NJ.

FL DNR - Florida Department of Natural Resources.

Géry, J. 1977. Characoids of the world. Tropical Fish Hobbyist Publications, Inc., Neptune City, NJ.

Weitzman, S.H. and L. Palmer. 1997. A new species of Hyphessobrycon (Teleostei: Characidae) from Neblina region of Venezuela and Brazil, with comments on the putative 'rosy tetra clade'. Ichthyological Exploration of Freshwater 7(3):209-242.

FishBase Summary

Author: Nico, L.

Revision Date: 6/22/2012

Peer Review Date: 6/22/2012

Citation Information:
Nico, L., 2024, Hyphessobrycon eques (Steindachner, 1882): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=422, Revision Date: 6/22/2012, Peer Review Date: 6/22/2012, Access Date: 5/20/2024

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. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [5/20/2024].

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