- Kottelat, M. 1997 European freshwater fishes. Biologia 52, Suppl. 5:1-271. (Ref. 13696)
- Kottelat, M. and J. Freyhof 2007 Handbook of European freshwater fishes. Publications Kottelat, Cornol, Switzerland. 646 p.
Habitat and Ecology
Lacustrine, in deep water. Spawns along shores.
Lacustrine species, not reported to migrate to tributaries. Only caught in May (hence the vernacular name) when it comes in to shallow waters, presumably to spawn. Eggs white, about 2 mm in diameter. Feeds on fishes.
IUCN Red List Assessment
Red List Category
Red List Criteria