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Abstract
Diel and seasonal shifts in the feeding activity and intensity of a riverine stock of European eels, Anguilla anguilla (L.), were assessed in the Rio LLorin, a right-side tributary of the Rio Esva drainage (northwestern Spain). No consistent diel cycles were detected in either season (eels feed with similar intensity in the day and at night), but increased feeding activity was evidenced during the warmer months relative to weaker but still significant activity in winter. Heterogeneity in both feeding activity and intensity may stem from the high rates of secondary production in the form of benthic food available for eels, and mild temperatures all year round.
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