Marblefish

Aplodactylus arctidens

The Marblefish, or Aplodactylus arctidens, is a distinctive reef fish found in the southwestern Pacific Ocean, particularly around southern Australia and New Zealand. It can grow up to 70 cm in length and is characterized by its elongate body, olive green or brown coloration, and a pattern of small whitish spots and blotches. Its mouth is small and slightly downturned, with fleshy lips and tricuspid teeth arranged in dense rows. The dorsal fin is notable for its long base, nearly divided into two parts, with 16-19 spines and 16-18 soft rays. Marblefish inhabit weedy reefs in shallow waters, typically at depths of 0 to 20 meters, though they have been recorded as deep as 40 meters. They are primarily herbivorous, grazing on red and brown algae, but will also consume small invertebrates found within the algae. These fish are solitary and territorial, often defending their chosen area. In New Zealand, they spawn during August and September. Divers encountering Marblefish can expect to find them on temperate reef slopes, where they blend into their surroundings with their mottled coloration. While they are harmless to humans, their flesh is considered coarse and not particularly palatable, making them of little interest to fisheries. The conservation status of the Marblefish has not been evaluated by the IUCN.