For Kentaro Amemiya of Tokyo Sea Life Park, perspective is everything when dealing with a creature as unusual as the finespotted jawfish.

"Here we arrange our exhibitions so that visitors can enjoy observing the fish from four perspectives: swimming, eating, self-defense and breeding," Amemiya, who is in charge of rearing the fish, said. "The fine- spotted jawfish is a species good for observing the latter two aspects."

As paternal mouthbreeders, adult male finespotted jawfish incubate fertilized eggs in their mouths for about 10 days until they hatch. At the aquarium, visitors can clearly see the grayish mass of eggs inside its mouth.