Perionyx excavatus (short collective name “Blues”) is a beautiful worm with an iridescent blue or violet sheen to its skin clearly visible under bright light. In dense populations Blues will grow to only 75mm at most. Given plenty of room, they can easily make 150mm. Blues make excellent fishing bait.
They have an impressive growth and reproductive rate far in excess of the other species grown in bin culture.
Like all tropical worm species Blues have a very poor tolerance for low temperatures, fluctuations in their environment or disruption to the system.
Blues are referred to as “Travellers” because of their practice of migration, sometimes en masse, particularly during heavy rain events. At these times, in the wild, they can even be found in the tree tops, basking in the rain shower.