Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish.
Silver pearlfish
The silver pearlfish, "Encheliophis homei", is a species of eel-like fish in the family Carapidae. This pearlfish lives inside the coelom of sea cucumbers such as "Bohadschia argus", "Thelenota ananas ", and "Stichopus chloronotus". It is native to tropical and subtropical parts of the Indo-Pacific Ocean.