English: Mytilopsis sallei was detected and eradicated from a harbour in Darwin, NT in the late 1990s. The most likely vector for the spread of M. sallei is on the hulls and internal water systems of commercial and recreational vessels. It could also be spread as fouling on aquaculture equipment. Spread via ballast-water appears less likely because of the short duration of the larval stage. Marine scientists believe this species has the capacity to colonise tropical and sub-tropical areas in northern Australia from Fremantle, WA, to Sydney, NSW, as well as the warmer parts of the Spencer and St Vincent Gulfs in South Australia, if transported there.