The examination of different selectivity studies presented to the workshop showed the technical and practical difficulties in defining a single method to apply in the various situations encountered in the Mediterranean, but the need for using common rules to facilitate the exchange and the comparison of the results was underlined. Fish behaviour, survival after escapement and experimental reliability of statistical methods were discussed. The workshop acknowledged that square meshes are more selective than diamond meshes. It further stressed the need to investigate the selectivity impacts of square meshes on various species of different shapes (e.g. flatfishes) and to evaluate selectivity in economical terms. The workshop recommended the realization of a practical guide for selectivity studies in the Mediterranean and the establishment of a common selectivity database including both technical elements of the experimentations and parameters of selectivity obtained. The need of establishing a network of fishing technologists including the fishing sector representatives was also expressed.
LAEexamen de diffUrentes Utudes prUsentUes durant cet atelier a montrU les difficultUs techniques et pratiques pour la dUfinition dAEune mUthode unique applicable dans les diverses situations rencontrUes en MUditerranUe, mais lAEaccent a UtU mis sur la nUcessitU d'utiliser des rYgles communes pour faciliter l'Uchange et la comparaison des rUsultats. Le dUbat a portU sur le comportement des poissons, leur survie aprYs Uchappement et la fiabilitU expUrimentale des mUthodes statistiques. Il a reconnu que les maillages carrUs Utaient plus sUlectifs que les maillages en losange et a jugU nUcessaire de continuer O Utudier la sUlectivitU des maillages carrUs pour les espYces de formes diffUrentes (par exemple, les poissons plats) et dAEUvaluer la sUlectivitU sur le plan Uconomique. LAEatelier a recommandU la rUalisation d'un guide pratique pour des Utudes de sUlectivitU en MUditerranUe et lAEUtablissement dAEune base de donnUes de sUlectivitU commune comprenant O la fois des UlUments techniques des expUrimentations et les paramYtres de sUlectivitU obtenus, ainsi que la mise en place dAEun rUseau de technologistes de la pUche incluant des reprUsentants du secteur de la pUche.