10 20 40 60 cm
mittakaava < 40 cm
© Copyright: Images:
Gösta Sundman: Suomen Kalat (Kansalliskirjasto, The National Library of Finland), Lauri Urho, Petri Savola (Uudenmaan ympäristökekskus). All rights reserved.
- Family: Carps and minnows – Cyprinidae
- Similar species: carp
- Size: 30-40 cm, 0.5-1.5 kg.
- Appearance: The distinctive shape and colour of the tench make it difficult to confuse with any other fish. This thick-set fish has an overall rounded appearance, including the fins. Caudal fin almost unforked, tips rounded. Like the carp, it has a single pair of barbels at the mouth, but its dorsal fin is much shorter and the scales so small (95-120 along the lateral line) as to give an almost scaleless appearance. Eyes very small. Pelvic fins longer in male than female.
- Colouring: Overall dark, colour fading after death. Back and sides olive green with shades of bronze, belly yellow-orange. Eyes red and fins dark brown.
- Reproduction: Spawns on the bottom among reeds once the water temperature has reached 18-20 degrees, i.e. usually in June-July.
- Food: Benthic invertebrates.
- Distribution and habitat: Occurs naturally in Finland, and numbers have been boosted by stocking. Tench do not thrive above latitude 62 north and are thus restricted to nutrient-rich lakes in southern Finland and sea inlets of the Gulf of Finland. Tench are typical bottom fish, seldom moving into surface water.