Taxonomy Search:

Hyperacanthomysis longirostris
Image courtesy of Tricia Bippus, California Department of Fish and Wildlife, IEP Diet and Condition Study
Hyperacanthomysis longirostris
Taxonomic Group: Crustaceans-Mysids


Hyperacanthomysis longirostris is a Mysid crustacean. It is native to coastal waters of the Northeast Pacific, including southern Japan, Korea, and China. It is introduced in the Sacramento-San Joaquin Delta, California where it is concentrated in low-salinity estuarine habitats. It maintains a population in 0-5 PSU, largely by a pattern of vertical migration, migrating upward on incoming tides. It has become the predominant mysid in the delta, largely replacing a native mysid species (Neomysis mercedis), which is an important food organism for juvenile fishes.

This is some default tab content, embedded directly inside this space and not via Ajax. It can be shown when no tabs are automatically selected, or associated with a certain tab, in this case, the first tab.


Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
Access Date:

Marine Invasions Lab
Smithsonian Environmental Research Center

P.O. Box 28
647 Contees Wharf Road
Edgewater, MD 21037-0028 Tel: 443 482 2200
Fax: 443 482 2380

Databases Overview| Chesapeake Bay | National Database |