The Maryland Department of Natural Resources has found no additional northern snakeheads in Columbia's Lake Kittamaqundi after one was caught there last month.
Bob Lunsford, DNR's director of freshwater fisheries, said the department electroshocked the lake on Thursday and saw no snakehead float to the surface.
The move was taken after a fisherman caught a snakehead May 28 and sent photos of it to the department. Lunsford said the 5- to 6-pound fish was positively identified as a snakehead, and DNR will study it to see if it is related to the snakeheads that were found in Crofton ponds in 2002.
"There's no unusual concern," Lunsford said. "It's just another occurrence of an exotic species that we don't know the impact of the introduction will be."