Monitor elvers as they migrate up the River Mole. Eels are temporarily trapped, they are counted and measured; and then released to continue their journey upstream.
A summary of the data collected during this project:
Data from the River Ember (a channel of the River Mole) monitoring site were cleaned by ZSL staff, at the end of the migration season, and reported alongside other Thames River Basin District monitoring sites to the Environment Agency, where they are fed into the Eel Management Plan for the region.
2105 eels, of which 526 (25%) were less than 120mm in length, were recorded by volunteers that checked the Ember trap twice per week. Eels of less than 120mm are considered elvers, which are young of the year in freshwater. The catch demonstrates the importance of the Ember for eel and that newly arriving elver are able up to migrate upstream to Island Barn weir from the Thames.
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