Le franchissement des barrages par l'escalade de l'anguille. Etude en Sèvre Niortaise

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Abstract
A particularity of the eel anadromous migration is to crawl out of the water to pass over obstructions. This behaviour was studied in the freshwater area, in the downstream part of the Sevre Niortaise watershed. On the dams where different sluices types can be observed, the eel can only move up on small vertical areas of the walls. This crawling behaviour may be compared to a climbing one. Under these conditions, the climbing is very selective: only the smallest individuals (< 100 mm long) can move up on the walls and try to pass over them. Very few of them succeed in clearing dam due to the configuration of these structures. Thus, climbing observations are not necessarily related to actual clearing of the dam. Other ways to clear dams seem to be few, so the limitation of dams effects on the eels colonization of watershed area is essential. The fitting of eel passes for eels, which use climbing behaviour is a priority to protect this species.

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