Long jawed fish, crane-billed weevil fish, tilapia and more. According to the query ranking of ornamental fish with the highest IQ, as of April 22, 2023, its most intelligent ornamental fish are longjaw fish, cranebill weevil fish, roan fish, manta ray, koi fish, dragonfish, blue hangers, octopus, pigtooth fish, and grouper. Ornamental fish are fish with bright colors or odd shapes that have ornamental value.