Turkish Journal of Fisheries and Aquatic Sciences [email protected] +90 464 223 33 85/1440 Gill nets fitted with Dukane NetMark 1000 pingers had significantly less bycatch of harbor porpoises than control nets and the fish size and catch rates of the target species were not affected. http://www.trjfas.org/pdf/issue_9_2/151_157.pdf