In five experiments, Atlantic salmon (Salmo salar L.) parr were found to grow better under conditions of rhythmically alternating water temperature (P-1) than that for the salmon reared under stable conditions (1.85% day-1).
Berg, O. K., Finstad, B., Grande, G., & Wathne, E. (1990). Growth of Atlantic salmon (Salmo salar L.) in a variable diel temperature regime. Aquaculture, 90, 261–266. https://doi.org/10.1016/0044-8486(90)90250-Q