Biological Invasions

, Volume 8, Issue 4, pp 697–702

Seasonal Abundance and Occurrence of the Asian Isopod Synidotea laevidorsalis in Delaware Bay, USA

Invasion note


In 1999 the marine isopod Synidotea laevidorsalis (Miers 1881), indigenous to the northwest Pacific, was first documented in Delaware Bay, USA. We monitored weekly recruitment of this isopod and several other motile species in the Maurice River, a tributary of Delaware Bay. A spatial survey was also conducted. Abundance of S. laevidorsalis varied seasonally but overwhelmingly dominated other co-occurring species by an order of magnitude or more throughout most of the year. Isopod abundance increased through the summer of 2004 and peaked in September, coincident with the passing of Hurricane Ivan. Field observations documented large populations, frequently associated with pilings and buoy lines, throughout Delaware Bay in salinities of 4 through 22 ppt. The dramatic abundance of this isopod indicates that there is considerable potential for altering community structure. This isopod has yet to be observed along the Atlantic Coast of New Jersey or in Chesapeake Bay, but it has been reported near Charleston, SC.


Asian benthic Delaware Bay Hurricane Ivan invasion isopod New Jersey non-native Synidotea laevidorsalis 







Delaware River Basin Commission


Haskin Shellfish Research Laboratory, Rutgers, The State University of New Jersey






New Jersey


New Jersey Department of Environmental Protection


salinity of water as measured in parts per thousand


South Carolina


United States Geological Survey




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Copyright information

© Springer 2006

Authors and Affiliations

  1. 1.Haskin Shellfish Research Laboratory, Institute of Marine and Coastal Sciences, New Jersey Agriculture Experiment Station RutgersThe State University of New JerseyPort NorrisUSA

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