On-growing of fry continues in a recirculation facility, where water quality, temperature control, biosecurity protocols and automated feeding systems are monitored.
At between 5-10g fish are transferred into concrete tanks and earthen ponds until ready for the Macquarie Harbour or Tamar River marine sites when about 100g.
Artificial lighting helps the fish make the transformation from the parr to smolt stage (a process known as smoltification – a series of physiological and morphological changes which enable the fish to thrive in a saltwater environment).
Fish are vaccinated and assessed on their ability to transition into saltwater. They are hand graded to ensure only the highest quality are stocked into the marine sites.
Fish are fed a specialised diet prior to, and for several weeks after, transfer to minimise stress and optimise saltwater acclimation and survival.