Monitoring fish stocks in Nivelle River

Monitoring fish stocks in Nivelle River

On the Nivelle River, in addition to the surveys carried out at the trapping stations, various fish population monitoring programmes are conducted throughout the river system. The data from these various monitoring programmes are available in the annual report.

Tacon

"Salmon" abundance indices (IA SAT)

These indicators (number of juveniles caught per five minutes of fishing) (Prévost et al 1993) have generally been carried out in late September since 2005

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Truite juvénile

Trout abundance indices (IAT VIGITRUITE®) 

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

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Frayére saumon

Counting of spawning grounds

These spawning ground couting (for salmon and/or lamprey) have been carried out since 1984