Trout juvenils

IAT (VIGITRUITE®) "Trout" Abundance Indices

IAT surveys are generally carried out in late September using the ‘Vigitruite®’ method (Roussel 2004). The sampling points were distributed across the Oir river system in order to focus specifically on the tributaries, which remain the areas most favoured by young trout.

CarteOirIAT

All juveniles caught are measured (Lf to the nearest mm), weighed (Pds to 0.1 g) and sexed (maturing males). Scales are collected depending on the size of the individuals, and any markings are noted.

 

PeriodeIAT

In this folder

The downstream of the Roche stream (over a distance of about 2 km) are fished in the spring, in May, and in the autumn, in early October.