Abstract
The mean biomass (B̄) and production ( P) of four fish populations (brown trout, Salmo trutta m. fario (L.)), Iberian roach, Rutilus arcasii (Steindach.), Iberian nase, Chondrostoma polylepis (Steindach., ssp. duriensis (Coelho)), and eel, Anguilla anguilla (L.)) were assessed in the Âncora River, north Portugal. At four sites located along the course of the Âncora River and one site on its tributary B̄ and P were in the range 36.5–283.9 kg ha −1 and 34.0–608.5 kg ha −1 yr −1, respectively. Lowest values were recorded at sites in the middle course of the main river, isolated by numerous dams and waterfalls. Greatest values were recorded in the natural tributary (Gondar Creek) and in the outflow section of the main river.
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