This research was conducted on June until September 2019 in Fish Hatchery and Breeding Laboratory, Faculty of Fisheries and Marine University of Riau. The aims of this research was to know the effect of fedding earthworms (Lumbricus rubellus) with different frequency for eeg quality of lelan (Osteochilus pleurotaenia Blkr). The method in this research was an experimental method with Completely …