| To verify if and to what extent egg and nauplii development of the salmon lice take place during winter, the development from egg to the copepodid stage at 2,3,4,5 and 10°C was examined. Newly extruded egg strings from a winter population of salmon lice were individually placed in 6 ml stagnant hatching systems. Initially, no significant differences in egg development time were found between these and larger aerated systems, though a tendency for less synchronised hatching of the total egg string was detected in the stagnant systems (difference< 12 h). In light versus dark conditions the time to hatching was significantly prolonged by darkness (10-15%). The use of small stagnant experimental units was a pronounced simplification of hatching methods... |
