Torquigener albomaculosus

Lore & Background

The white-spotted pufferfish was named in 2014, becoming the 20th species in the genus Torquigener. Its body is brownish-yellow with white spots, and the ventral part is translucent. Specimens were collected off the south coast of Amami Ōshima in the Ryukyu Islands at depths between 10 and 27 m. The species is relatively small, reaching about 10 cm in length.

Its most remarkable trait is the male's courtship display: he creates large circular nests, 2 m in diameter, by flapping his fins along the seafloor over 7–9 days. The nest features an outer ring of ridges and valleys and a central maze-like pattern made of fine sand. Males decorate the structure with shells and coral. Females evaluate the nest and, if impressed, lay eggs in the center. The male guards the eggs until they hatch and never reuses the nest.

Such nest designs were noticed as early as 1995, but their creator remained unknown until the species was described. In 2018, similar nests were observed off Western Australia, likely made by a related Torquigener species.

Reader's Guide

The white-spotted pufferfish is significant primarily for its unique mating ritual, which involves the construction of the most geometrically ordered structures known to be created by any fish. The nests serve as a platform for female choice: females may assess male body size and health from the spacing of the outer ridges, as larger males push sand farther. Males also perform additional courtship behaviors—stirring sand to show its quality, and a rush-and-retreat display—before spawning. Spawning occurs from spring to summer; after mating, females leave, and males guard the eggs for about five days until hatching, after which the nest deteriorates. The species was named one of the 'Top 10 New Species' in 2015 by the International Institute for Species Exploration. Its cultural impact includes being featured in a BBC documentary narrated by David Attenborough, who described the fish as 'nature's greatest artist.' The discovery resolved a long-standing mystery about the origin of the circular sand patterns seen on the seafloor since 1995.

Did You Know?

• The male works for more than a week straight to build the 2-meter-wide nest.
• The nest's center is made of very fine sand particles moved by the male's anal fin.
• Males never reuse a nest after the eggs hatch.
• Similar nests were observed off Western Australia in 2018, likely from a related Torquigener species.