Thisresearch aimsto determine the effect of larval soaking and the best immersion dose using Raja Siam probiotic solution at different doses on the growth and survival of asian redtail catfish (Hemibagrus nemurus). This research was conducted from 03 june to12 July 2024attheFish Hatchery and BreedingLaboratory,Faculty of Fisheries and Marine, Riau University. The container used was an aquarium …