When I utilised silkworm moths as the animal protein source in the rainbow trout feed then the results obtained in terms of survival and growth was not up to the bench mark but in case of the utilisation of the silkworm pupae as the animal protein source the result was quite innovative and superior to the shrimp meals diet.
Black soldier fly is used quiet frequently as fishmeal substitute:
Kroeckel, S., Harjes, A.-G. E., Roth, I., Katz, H., Wuertz, S., Susenbeth, A., & Schulz, C. (2012). When a turbot catches a fly: Evaluation of a pre-pupae meal of the Black Soldier Fly (Hermetia illucens) as fish meal substitute — Growth performance and chitin degradation in juvenile turbot (Psetta maxima). Aquaculture, 364-365, 345–352. doi:10.1016/j.aquaculture.2012.08.041