AEI prepress abstract  -  DOI: https://doi.org/10.3354/aei00320

Development of the salmon louse Lepeophtheirus salmonis parasitic stages in temperatures ranging from 3 to 24°C

Lars Are Hamre*, Samantha Bui, Frode Oppedal, Rasmus Skern-Mauritzen, Sussie Dalvin

*Email: lars.hamre@uib.no

ABSTRACT: The development rate of the salmon louse Lepeophtheirus salmonis is greatly influenced by seawater temperature. This study describes how the growth rate of L. salmonis changes with temperature and identifies the extreme high and low temperatures at which development to adult is compromised. Atlantic salmon Salmo salar were infected with copepodids and development was monitored in eight temperature groups spanning 3 to 24°C until the lice were adult. Development was severely compromised at 3°C and 24°C, while the lice developed normally in the temperature range from 6-21°C. At 6°C most female lice had become adults at 72 days post infection (432 degree-days). At 21°C development was significantly faster and most females were adults after 13 d, at only 271 degree-days. After infection, lice grew through 5 stages before reaching the adult stage, all of which, with a few exceptions, appeared to last approximately equally long. Thus, a simple model describing the mean daily growth rate (stages per day) as a function of temperature was made for each sex. The relationship between mean daily growth rate and temperature was best described by a second-order polynomial. The term relative age is introduced and used to describe the pattern of development in terms of percent of total development time to adult and is applied to calculate the timing of developmental events as a function of temperature. Photoperiod and development under rising or decreasing temperatures had minor effects on development rate.