Adaptation of fisheries sonar for monitoring schools of large pelagic fish: dependence of schooling behaviour on fish finding efficiencyPatrice Brehmer, Stratis Georgakarakos, Erwan Josse, Vasilis Trygonis and John DalenAquat. Living Resour., 20 4 (2007) 377-384DOI: https://doi.org/10.1051/alr:2008016