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Lori Wolfe/The Herald-Dispatch Justin Zhang, 6, of Proctorville, Ohio, learns to check the oxygen levels in river water with ORSANCO Education Specialist Melissa Mann during the Health Check-Up of the River class held Monday, July 26, 2010, at the Cabell County Library.

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Lori Wolfe/The Herald-Dispatch ORSANCO Education Specialist Melissa Mann displays two catfish from the Ohio River to children attending the Health Check-Up of the River class held Monday, July 26, 2010, at the Cabell County Library.

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Lori Wolfe/The Herald-Dispatch ORSANCO Education Specialist Melissa Mann displays two catfish from the Ohio River to children attending the Health Check-Up of the River class held Monday, July 26, 2010, at the Cabell County Library.

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Lori Wolfe/The Herald-Dispatch Children listen as ORSANCO Education Specialist Melissa Mann talks about testing the oxygen levels of the Ohio River during the Health Check-Up of the River class held Monday, July 26, 2010, at the Cabell County Library.

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Lori Wolfe/The Herald-Dispatch ORSANCO Education Specialist Melissa Mann asks children questions about the Ohio River during the Health Check-Up of the River class held Monday, July 26, 2010, at the Cabell County Library.

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Lori Wolfe/The Herald-Dispatch ORSANCO Education Specialist Melissa Mann records the temperature of water from the Ohio River during the Health Check-Up of the River class held Monday, July 26, 2010, at the Cabell County Library.

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