The silver-sided bleaks like to keep right to the surface. In the summer they bring life to a calm surface, where they pop insects that accidentally come too near to the surface. During spawning period in May to June shoals of bleaks seeth on low sand and rock bottoms, and they sometimes jump above the surface. Dense spawning shoals are an easy feast for seagulls and terns. Sometimes you can see roaches nesting among schools of bleak with their tails pointed upward, and bleaks picking parasites from the roaches’ scales. Bleak is encountered everywhere in Finland except in the northern most parts of Lapland.