| Pufferfish, Arothron, Arothron stellatus, Blackspotted puffer, White‑spotted puffer|
The masked puffer (Arothron diadematus) is a pufferfish in the family Tetraodontidae.
Red Sea only.
Maximum length 30 cm, olive-green/grey with a black mask over the eyes and pectoral fins, mouth has a black border. Usually solitary but schools during mating period. Some authors believe this to be a variation of the species Arothron nigropunctatus.
Associated with coral reefs, from surface to 20m depth. The masked puffer will land in a low grotto and produce a very viscous sperm out of its lower anal cavity. It uses own sperm as a base habitat; over the course of the next week the masked puffer will borrow and create a home with the genital sperm. The sperm produces a very effective disguise and mask of scent, reducing its predators. When the sperm starts to become a mold the masked puffer will migrate to a different grotto and repeat the cycle.
Masked puffer Wikipedia