Fish larvae of 20 dph showed higher Se concentration (9.5±0.2 μg/g DW) with the Se-30 enriched diet than with the control diet (1.3±0.3 μg/g DW), but there was no significant 31 differences in the composition of polyunsaturated fatty acids which significantly affect larval 32 growth and development. Therefore, the feeding of Se enriched rotifers enhanced growth 33 and development of the red sea bream P. major larvae.