Delaware officials said yesterday that tests of water samples from the Indian River in early August verified the presence of Pfiesteria piscicida in a nontoxic form. The river will remain open, they said.
Researchers say Pfiesteria can take numerous forms, several of them toxic, but also can remain dormant and harmless for long periods. The state's Department of Natural Resources began investigating after several reports of fish with lesions. There have been no reports in Delaware of fish kills related to Pfiesteria or of human health complaints such as those experienced by several people in Maryland, said a department spokesman.