Ten Large White weaners with an average liveweight of 10.6 kg were assigned to two diets containing either fishmeal or house-fly-larvae-meal as the main protein source. The average daily gains of the pigs were 0.25 and 0.29 kg for the fishmeal and house-fly-larvae-meal diets, respectively. Feed conversion ratios were 3.64 and 3.29, and feed cost per kg gain were ¢2735.18 and ¢2470.89 for the fishmeal and house-fly-larvae-meal diets, respectively. Dressing percentage, fat measurements, and eye muscle area were not significantly affected (P