Results showed that the inclusion of insect meal and algal oil in the diet of salmon parr and smolts had no significant effect on growth and welfare performance (weight gain, specific growth rate, feed conversion ratio, condition factor, hepatosomatic index) . Parr underwent smoltification with no significant differences between the dietary groups, except at the fourth sampling: gill gene expression (HA vs BSFL) and plasma calcium (BSFL versus BSFL-AO ). The results of these trials suggest that the inclusion of insect meal , algal oil from Schizochytrium and astaxanthin from Haematococcus support salmon’s physiological adaptation to sea water when compared to a standard commercial diet. This underpins the potential of these novel ingredients to provide sustainable alternative sources of essential nutrients.