Rainbow trout are native to North America, but have been introduced to every continent in the world, except for Antarctica, for either recreational fishing, aquaculture or both. The extensive range of rainbow trout aquaculture globally has led to it becoming a candidate species for nutrition trials aimed to make finfish aquaculture more sustainable, including the feeding of broodstock. The salmonid family, of which rainbow trout are a member, are famous for their bright orange coloured eggs. Colouration of the eggs is due to various carotenoids, but the level of colouration is down to the mothers and is one of the many traits that has been determined to be diet-dependent. What a female trout eats while she is developing eggs can have large effects on the egg colour, quality, juvenile quality, and overall survival.
Under the current FRDC funded project “Insect Proteins for Aquaculture”, Future Green Solutions in partnership with UWA, and with the keen involvement of PhD student Kat Doughty, will be running studies to assess whether diets based on black soldier fly larvae can be used as feed for rainbow trout broodstock. We will monitor multiple traits including egg quality, egg survival, and hatching success. This will guide future decisions about the use of sustainable, insect-based food sources in multiple life stages of farmed rainbow trout.