Characteristic black and green stripes with red fins and dark eye. Spined dorsal fin.
Males mature earlier than females, usually 2-4 years with females being 3-5 years. This maturity can be earlier if food is plentiful. Females grow larger than the males and, although they take longer to mature, they actually grow faster. Perch live up to 20 years.
Females can produce masses of eggs, directly related to their size – the larger the female, the more eggs produced. After hatching, alevins are equipped with a yolk sac from which they feed for the next few weeks. Then they slowly become fry and feed on water fleas and the like.