Status and Life History Traits of Gill Lice Salmincola californiensis in Colorado

Gill Lice are parasitic copepods that target fishes, primarily salmonids.  Gill lice attach to gill filaments and limit oxygen exchange, negatively impacting fish behavior, immune system function, growth, warm water tolerance, sexual maturation, fecundity, and survival.  To date, very little research has been conducted on gill lice.  We are conducting laboratory and field research to evaluate their distribution and relative abundance.  We are also sampling native salmonid species, as well as other popular sport fish, in Colorado to assess the thermal tolerance of infested fish, thermal tolerance and survival of gill lice, and the species and sizes of fish that are most heavily affected.  We are also interested in how these interactions might be altered and potentially exacerbated by a warming climate and potential changes in water availability.  Understanding impacts gill lice have on fish populations will help managers in the state mitigate the negative consequences of gill lice infestations.