Photos about cornetfishes (Fistulariidae); including larvae and juveniles: Cornetfish larva on a blackwater dive off Oahu. Cornetfish larvae are huge. This "little" guy is close to 5".Cultured cornetfish larva (Fistularia commersonii).Cornetfish Fistularia commersonii) larva on a bonfire dive in the Solomon Islands.Adult smooth cornetfish (Fistularia commersonii) on a reef in Hawaii.