- Squalius danilewskii Kessler, 1877
Value of species
Records of L. leuciscus from Don drainage probably refer to L. danilewskii.
Prefers main course of rivers, with clear water, moderate to slow current, sand or sand-clay bottom. Avoids turbid and still waters. Commonly stays on bottom, in water 0.3-3 m deep. Spawns in stretches with heavy current and stone bottom.
Forms small groups of individuals of similar size. Lives up to seven years. Spawns in April-May at 5-6°C. Eggs are 2.0 mm in diameter, sticky, slightly transparent. Eggs hatch in 9 days at 13°C. Larvae lack adhesive glands, lie passively on bottom, are negatively phototactic. Starts active feeding at 16 days. Feeds mainly on insects and their larvae, molluscs, also on other benthic invertebrates and algae.