Is speed through water a better proxy for fishing activities than speed over ground? Pierre Gloaguen, Mathieu Woillez, Stéphanie Mahévas, Youen Vermard and Etienne Rivot Aquat. Living Resour., 29 2 (2016) 210 Published online: 10 October 2016 DOI: 10.1051/alr/2016023