Two kind specimens have been also captured between 1984 and 2004. Since the Ornate Sleeper Ray is hardly ever witnessed and you can find none in captivity, it is the rarest fish on earth. Picture Editorial Credit rating: Wikimedia Commons The Satan’s Gap Pupfish is probably the rarest fish on https://customaquariumtanks.blogspot.com/2025/02/how-to-set-up-your-first-aquarium.html