10 20 40 60 cm
mittakaava < 40 cm
© Copyright: Images:
New York State Department of Environmental Conservation, Petri Savola (Uudenmaan ympäristökeskus), Lauri Urho. All rights reserved.
- Family: Catfishes – Ictaluridae
- Similar species: None in Finland
- Size: 20–35 cm.
- Appearance: The first thing that catches the eye about the brown bullhead is the eight long barbels arranged in pairs around the mouth. Another unexpected feature is the presence of an adipose fin, which we normally associate with salmonids. Also prominent are the spines on the pectoral and dorsal fins. The head is broad, slightly flattened, skin without scales.
- Colouring: Back uniform olive-brown, belly pale. Sides may show some mottling.
- Reproduction: Spawns in summer. The male prepares a bed among stones or under a fallen tree and entices several females to lay.
- Food: Benthic invertebrates and small fish.
- Distribution and habitat: The brown bullhead originates from North America. It was first introduced into a few ponds in southern Finland in the 1920s, and has since been transferred to other similar waters in the same region. In Finland, the fish thrives best in nutrient-rich ponds, where it copes well with low oxygen levels. Has since spread to slow-moving rivers and can even be found along the coast between Helsinki and Hamina.