Résultats des observations réalisées en 1984 sur le site du terminal méthanier de Montoir-sur-Loire. Effets des ouvrages de prise d'eau sur l'ichtyofaune estuarienne: Convention GDF - Rapport final 1984

Abstract

This report summarizes a biological monitoring study conducted in 1984 by IFREMER, at the request of GAZ DE FRANCE, concerning the impacts of the Montoir liquefied natural gas terminal on the Loire estuarine ecosystem, particularly on ichthyofauna (fish and other aquatic species). The goal was to assess the mechanical impact of the water intake system on the mortality of fish species by observing the fauna trapped in the pumping system and the chances of survival after being released back into the Loire.The study identifies several issues, notably the limited effectiveness of the screening system, which allows larger fish (such as eels) to pass through and get trapped on the drums, preventing their return to the Loire. Additionally, the cleaning rakes often deposit trapped fish into waste bins, blocking their escape. The report suggests increasing the rotation frequency of the cleaning drums and improving the evacuation systems to reduce fish mortality. It also recommends regular cleaning of the drainage channels to prevent the accumulation of waste (such as algae and detached young mussels) that impairs the effective evacuation of fish.In conclusion, the terminal's impact is exacerbated by inadequate management of the pumping and filtration system, affecting the estuarine aquatic fauna.