The reproductive output of sea lice Caligus rogercresseyi under controlled conditions

Abstract: Gravid females of Caligus rogercresseyi were collected from Atlantic salmon (Salmo salar) from a farm located at Chiloe Island (42°40′S73°15′W), Chile, to obtain information about the reproductive output of this parasite in vitro. The egg strings removed from the females were incubated under controlled conditions to obtain virgin adult females. One female which had mated only once produced eleven generations of eggs strings in a period of 74days. The first egg strings of the females obtained in vitro were produced at 389 degree days (°D) after egg incubation, while the next generations of eggs strings were produced with a periodicity between 4 and 6days dependent on the water temperature. The average length of the egg string was 3.1mm and the mean number of eggs per string was 31. The values recorded in captivity for the egg string length and the number of eggs per string, were lower than the values recorded in gravid females from the field. One female survived for 79days and males, maintained separately from the females, survived for 60days. [Copyright &y& Elsevier]