In this Feb. 7, 2012 photo, signs warning of the dangers of eating fish from the Donna Reservoir in Donna, Texas have been repeatedly vandalized over the years like this one. State and federal officials struggle to convince fishermen of the risks. (AP Photo/Chris Sherman)

Associated Press
In this Feb. 7, 2012 photo, signs warning of the dangers of eating fish from the Donna Reservoir in Donna, Texas have been repeatedly vandalized over the years like this one. State and federal officials struggle to convince fishermen of the risks. (AP Photo/Chris Sherman)
In this Feb. 7, 2012 photo, signs warning of the dangers of eating fish from the Donna Reservoir in Donna, Texas have been repeatedly vandalized over the years like this one. State and federal officials struggle to convince fishermen of the risks. (AP Photo/Chris Sherman)
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