Fig. 1

Vertical transmission of Facilispora margolisi in Lepeophtheirus salmonis. Microsporidian infection (arrows) in the copepod ovary (a) and egg string (b) by in-situ hybridisation. Microsporidian spores (arrow) in Giemsa-stained egg string (c). Microsporidian spores (arrows and arrowheads) in Giemsa-stained (d) and in-situ hybridisation (e) preparations of nauplius larvae. Insets are higher magnification images