John Freedman, Penn State (IMAGE) Penn State Caption Jonathan Freedman, shown here untangling a fish from a trap net, developed an electrified benthic trawl to sample bottom fish assemblages at dredged and undredged sites in the deep river pools. Credit Jonathan Freedman Usage Restrictions Non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.