 The bulge in the chest is absent, and he may only be two thirds the width of a comparative female of the same length, and consequently weigh far less.The males head is quite pointed and the snout appears slightly upturned, whilst the females head is rounder and with a snub nose.In the breeding season males become covered in tubercles and often display a reddish flush on their bellies and intense vermilion pectoral and ventral fin colouration, whilst all other fins can become very dark and opaque.