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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: Ohio shrimp

Taxonomy: available through www.itis.gov

Size: Females are larger than males, reaching 110 mm TL (Bowles et al. 2000)

Native Range: Macrobrachium ohione is the most widely distributed and abundant of the six river shrimp species in the United States (Bowles et al., 2000) and originally was described from the Ohio River. It also is found in the middle and lower Mississippi River from Illinois to Louisiana, west to Oklahoma and Texas, in the Atlantic drainage from Virginia to northern Florida, and in the Gulf region in Alabama and Mississippi (Bowles et al., 2000; Hobbs and Lodge, 2010).

Alaska	Hawaii	Puerto Rico & Virgin Islands	Guam Saipan

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

Ecology: This shrimp inhabits primarily freshwater rivers and streams; however, their life cycle is associated with estuarine waters for reproduction (Bowles et al., 2000).

This species is amphidromous, where adults migrate downstream to spawn near estuaries, and juveniles swim back upstream and live as adults in freshwater (Bowles et al. 2000). Females, which are larger than males, can reach 110 mm in total length and are gray to green in color with light blue spots (Bowles et al., 2000). Females can produce 6,000–24,000 eggs with a lifespan of only 2 years (Huner, 1977).

Means of Introduction: Most likely a bait bucket introduction. There has been a commercial fishery throughout its native range for bait as well as for human consumption for many years (Bowles et al., 2000; Bauer and Delahoussaye, 2008).

Status: Unknown.

Impact of Introduction: Probably minimal impacts as this species is on the decline as a result of human impacts such as impoundments, river channelization, pollution, commercial fishing, and exotic predators (Barko and Hrabik, 2004; Bowles et al., 2000; Bauer and Delahoussaye, 2008; Hobbs and Lodge, 2010).

Remarks: It is the only endemic species of the genus in North America (Hobbs and Lodge, 2010).

References: (click for full references)

Barko, V.A., and R.A. Hrabik. 2004. Abundance of Ohio shrimp (Macrobrachium ohione) and glass shrimp (Palaemonetes kadiakensis) in the unimpounded upper Mississippi River. American Midland Naturalist 151(2):265—273.

Bauer, R.T., and J. Delahoussaye. 2008. Life history migrations of the amphidromous river shrimp Macrobrachium ohione from a continental large river system. Journal of Crustacean Biology 8(4):622—632.

Bowles E.E., K. Aziz, and C.L. Knight. 2000. Macrobrachium (Decapoda: Caridea: Palaemonidae) in the contiguous United States—A review of the species and an assessment of threats to their survival. Journal of Crustacean Biology 29:158—171.

Hobbs, H. H. and D. M. Lodge. 2010. Decapoda. Pages 901-967 in Thorp, J. H. and A. P Covich (eds.), Ecology and Classification of North American Freshwater Invertebrates, Third Edition, Academic Press, Amsterdam.

Idelberger, Chuck - personal communication, 2012, Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute, Charlotte Harbor Field Laboratory.

Author: Benson, A.J.

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.