Mossom Creek Hatchery volunteers discovered a great many salmon leeches crawling about in the aluminum Capilano trough in which coho spawners are being held until they are ready to have their eggs and milt taken. The distinct movement of these annelids can be seen as they stretch and contract, attaching alternately with their anterior and posterior suckers. Their presence in a cold, fast flowing salmon stream is normal. November 10 2013