Posted by: barn owl | February 13, 2008

Toxics Thursday: Arroyo Colorado Advisory on Smallmouth Buffalo and Longnose Gar


Longnose Gar
(Lepisosteus osseus)
Photo: Steven G. Johnson, via Wikipedia

The Texas Department of State Health Services released an advisory on Tuesday, which applies to Smallmouth Buffalo (Ictiobus bubalus) and Longnose Gar (Lepisosteus osseus) caught in Arroyo Colorado (Cameron and Hidalgo Counties, South Texas). Elevated levels of dichlorodiphenyldichloroethylene (DDE) and polychlorinated biphenyls (PCBs) have been found in both fish species, and high mercury levels were also measured in the Gar. DDE is an organochlorine pesticide, and PCBs, which were once used as coolants and lubricants, have persisted in the environment, although they were banned in 1979.

In addition to Arroyo Colorado, the advisory applies to Longnose Gar and Smallmouth Buffalo in Llano Grande Lake and the Main Floodway upstream from the Port of Harlingen.


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