CALIGUS, is an email service for communication related to the sea lice, ectoparasites of fish, including their biology and control on fish farms. The archive of list messages is at https://listserv.heanet.ie/caligus.html. Attachments are prohibited to prevent virus transmission. To join, send message "SUBSCRIBE CALIGUS firstname surname" to firstname.lastname@example.org (to leave say UNSUBSCRIBE). Omit your signature and anything else you may normally add. You will get an automated response.