Monitoring of populations in the river

Salmon juveniles

These indices (number of juveniles caught per 5 minutes of fishing) (Prévost et al 1993) have generally been recorded in late September since 1993

Trout juvenils

Since 2006, IAT surveys have generally been carried out in late September using the ‘Vigitruite®’ method (Roussel 2004)

Lamprey juvenils

Surveys of lamprey abundance (Lasne 2010) have been carried out in the autumn since 2009

Eels

Targeted eel surveys (IAA) have generally been carried out in late September since 2008

Fish population (all species)

These surveys, covering all species except lampreys, have generally been carried out in late September since 2008