Chesapeake Bay Introduced Species Database


Americamysis almyra

Common name(s):
mysid
Americamysis almyra is a mysid shrimp native to the Gulf of Mexico south to Terminos Lagoon (Mexico). Its first Atlantic collection was from the estuary of the St. Johns River FL in 1977 but just a few years latter is was found in Chesapeake Bay during a survey in the Patapsco River MD, in 1980. This is the only published Chesapeake record for this species, however, a similar species A. bahia is found all along the Atlantic Coast to Chesapeake Bay and RI, respectively. Due to the similarity in these species it may have been overlooked. Mysids are common in ballast water so it may have arrived on a ship from the Gulf of Mexico.
Image courtesy of S. Pothoven, GLERL, December 2006. (Hemimysis anomala).

Chesapeake Bay Status:

First Record
Population
Range
Introduction
Residency
1980
Established
Unknown
Cryptogenic
Regular Resident

Source Region
Native Region
Western Atlantic Western Atlantic

Vector(s) of Introduction
Shipping(Ballast Water)


History of Spread:

The mysid Americamysis almyra was described from specimens collected in Lake Ponchartrain, LA in 1953 (Bowman 1968). Subsequent collecting extended its range in the Gulf of Mexico south to Terminos Lagoon (Mexico) (Escobar-Briones and Soto 1988). Its first Atlantic collection was from the estuary of the St. Johns River FL in 1977 (Price and Vodopich 1979). In 1980, A. almyra was collected in July-September, in the Patapsco River MD, at an average density of ~1/m-3 (Grabe 1981). This is the only published Chesapeake record for this species. However, subsequent collecting has shown A. almyra to be abundant in Currituck Sound NC (Eaton 1994), and in other NC estuaries (Eaton 2000), and in GA and SC (Price 2000). Price considers the species, and its congener A. bahia, to be continously distributed along the Atlantic Coast to Chesapeake Bay and RI, respectively. He believes that it has been overlooked due to confusion with A. bigelowi. However, ballast water transport cannot be ruled out. Mysids of this genus were abundant in ballast water of ships, arriving from the Gulf of Mexico, and sampled in Baltimore (Ruiz et al., unpublished data).

Americamysis almyra has subsequently been recorded from the Patapsco River, but not from other Chesapeake Bay locations (Chesapeake Bay Program Database 2000). This species, and its congener A. bahia, may be common in the Bay, but overlooked due to confusion with A. bigelowi (Price 2000), which has been reported to occur throughout the Bay (Wass 1972).

History Reference - Bowman 1968; Eaton 1994; Escobar-Briones and Soto 1988; Grabe 1981; ; Price and Vodopich 1979; Price 2000



Invasion Comments:



This data was last modified on Friday, September 9th, 2005.
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