These graphs show data that were taken from an acoustic transducer pointing upward through the tanks. The time scale goes from midnight of one day to midnight of the next. There was also a tendency of increased growth observed for the fish in cages 5 and 8. It may be that the fish are particularly sensitive to ultraviolet damage. This is particularly the case for fish that are acclimated to indoor conditions, and which are moved out in the spring, when the sun is the most intense.
Farmers can protect their stock with the use of shade nets.