The zander (Stizostedion lucioperca) is a fish resembling a cross between the pike and the perch. It has a grey-green back, white underside, two dorsal fins and wide mouth with fangs. It is about 60 centimetres long and weighs about 7.5 kg. It is a solitary and voraciouspredator and lays up to two million eggs per year on vegetation in slow-flowing or still water. It was introduced to Britain 1878, but because it reduces stocks of fish including perch, roach and bream, there have been attempts to control its numbers. Research Zander
 
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