You may remember the big PCB problem at Big Springs Trout Hatchery on Big Spring Creek near Lewiston, Montana back in 2004. The hatchery had to kill about a million fish back then. Apparently a buried concrete aquarium might still contain some of the PCB contaminant. The plans are to do some testing, and cleanup if necessary, this fall. PCBs (polychlorinated biphenyls) were banned in 1976 because of their toxicity and their inability to degrade in nature (called persistent organic pollutant). The main concern of PCBs in humans is cancer, but in studies they have also been shown to interrupt the immune, reproductive, endocrine and nervous systems.

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