CtrlAQUA Research Center and The Freshwater Institute
Our RoleThe Freshwater Institute is part of CtrlAQUA’s Departments of Technology & Environment and Preventative Fish Health, providing extensive advisory and technology support to partners in Norway. Scientists and engineers at the Freshwater Institute are leading two projects in collaboration with Norwegian teams.
The HYDRO project, which began in 2015, looks at hydrodynamic challenges in huge culture tanks (more than 1,000 cubic meters) and seeks to develop models to determine how variables—such as splitting of water flow to the upper and lower dual-drains, inlet nozzle velocities, and the tank hydraulic retention time—impact solids flushing, water rotational velocities, and water mixing through the tank. Water rotational velocity within circular tanks can be used to optimize swimming speed for Atlantic salmon growth and disease resistance. Uniform water mixing is required so that fish are exposed to the same water quality throughout the tank. There is great potential to reduce fixed and variable costs with the application of large circular-type culture tanks of capacity near 1000 m3 for smolt and post-smolt production.
The PHOTO project is examining how different photoperiod regimes—or how long they are exposed to light—affect Atlantic salmon quality and robustness as post-smolts are raised in a freshwater reuse system. Producing larger smolts in freshwater systems represents a new variation in land-based post-smolt production. Photoperiod has been shown to have a strong influence on both smoltification and the initiation of sexual maturation. However, determining the optimum photoperiod regime during pre-growout freshwater rearing has not been adequately assessed. The PHOTO project is being conducted at the Freshwater Institute’s research system in 2016 and 2017.