2007). In France, there is a possibility that A. melas remained confused with A. nebulosus for over 100 years due to the high morphological resemblance (Nowak et al. 2008). Internal diagnosis of both species varied by differ-ent authors as follows: A. melas: gill rakers 15–19 (Kottelat and Freyhof 2007), 16–18 (Etnier and Starnes 1993), 17
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