Zander: where and when to see them

The zander is a large freshwater predator belonging to the perch family, Percidae. Native to parts of Europe and western Asia, including the Danube basin, it has also been introduced widely elsewhere. In the Saône, it is an introduced but established species. Its streamlined body, sharp teeth and excellent vision in dim light make it an effective hunter in large rivers and lakes. Despite sometimes being called a pike-perch, it is not a hybrid between a pike and a perch.

Size

Usually 40–70 cm long; exceptionally up to about 120 cm.

Weight

Commonly 1–4 kg; exceptionally around 20 kg.

Lifespan

Up to about 20 years.

Status

Least Concern (IUCN).

Zander are often most active around dusk, at night and near dawn. In turbid water, they may also hunt during daylight. Young fish commonly gather in shoals, while larger adults may occur alone or in smaller groups. They frequently remain near the bottom or close to underwater structure between hunting periods. Spawning takes place in spring, with timing influenced by water temperature and local conditions. The male prepares a shallow nesting site on suitable bottom material, often among roots, gravel or vegetation. After spawning, he guards the eggs and fans them with his fins to keep water moving over them. This parental care makes nesting males particularly vulnerable to disturbance.

• A reflective layer in its eyes improves vision in dim light.
• The male guards and fans the developing eggs.
• Zander and North American walleye belong to the same genus.
• Its eggs are adhesive and attach to material in the nest.

Wildlife opportunities depend on the river reach, water levels and species. River-specific viewing months have not been confirmed; general species seasons are not a local sighting forecast.

Zander inhabit large rivers, lakes, reservoirs and some low-salinity coastal waters. They favour relatively warm, productive waters, often with reduced visibility, but still require adequate oxygen. In rivers such as the Danube and Saône, they use deeper channels, pools and areas with moderate or slow currents. Submerged timber, rocky margins and changes in bottom depth provide useful shelter and hunting grounds. Suitable spawning areas offer firm substrate or exposed roots on which the adhesive eggs can attach.

Adult zander feed mainly on fish, including small cyprinids, perch and other locally available species. They generally take prey narrow enough to swallow whole. Young zander begin with zooplankton and small invertebrates before increasingly switching to fish as they grow. Cannibalism can occur, with larger individuals eating smaller zander.

Common name

Zander

Scientific name

Sander lucioperca

Animal group

Fish

Size

Usually 40–70 cm long; exceptionally up to about 120 cm.

Weight

Commonly 1–4 kg; exceptionally around 20 kg.

Lifespan

Up to about 20 years.

Status

Least Concern (IUCN).

Identification

The zander has an elongated, grey-green body with darker vertical bars or blotches along its sides and a pale underside. It has two separate dorsal fins, the first supported by sharp spines and the second mainly by soft rays. Large eyes and prominent canine-like teeth distinguish it from many other river fish. Compared with the European perch, it is more slender and lacks the perch's conspicuous red-orange lower fins.