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May 23, 2002
Mahogany tide found in the Coastal Bays.

Prorocentrum was found in the St. Martin River, Turville and Herring Creeks in the Coastal Bays. Concentrations were typically low except for one sample in the St. Martin River on April 29th when we found densities of 22,253 cells per ml. Prorocentrum is not considered to be a human health threat. Large and persistent algal blooms associated with Prorocentrum can lead to low oxygen conditions in the water and negatively affect habitat for submerged aquatic vegetation, fish and shellfish in the area. Find out additional information on Prorocentrum.

Concentrations of Prorocentrum minimum in 2002.

Largest historical Prorocentrum minimum bloom samples,State monitoring program samples or samples in response to water quality complaint calls, 1982-2002.
Date Location Cells per milliliter
03/02/82 Wicomico River (Potomac)/St. Catherine Sound 841,445
08/15/89 Patuxent River 680, 210
05/29/86 Love Point, Chesapeake Bay  
05/15/02 Magothy River 200,000
01/01/83 Middle River, Darkhead Creek 178,860
04/26/00 Middle Chesapeake Bay MCB4.1C 152, 823
09/21/94 Patapsco River/Baltimore Harbor 152,375
01/07/91 West River 126,286
12/03/95 Bear Creek/Chink Creek 117, 072
05/08/00 Ragged Point/Potomac River 105,066
05/09/00 Middle Chesapeake Bay 89,586
05/09/00 Middle Chesapeake Bay 74, 435