Spawn is deposited on food algae ( 06 Elysia viridis. Oosterschelde, Netherlands. ). When on a flat surface, it forms a spiral cord of about one and a half turns, diameter about 5.5 mm, containing over 800 ova. Spawn colour is reported to vary with the algal species eaten by the adult; reddish-yellow for Chaetomorphum linum in Denmark (Rasmussen, 1973), lemon-yellow to bluish white for Cladophora and white for Codium (Trowbridge & Todd, 2001), but variation in hue with age is also likely. This spawn is from an individual on Cladophora.

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