Hyporthodus septemfasciatus, the convict grouper, is a large species of grouper known from the waters of Japan, South Korea and China. Reports from western Australia are treated as misidentifications of . This species is unique among the groupers that it can tolerate temperatures of down to 8°C (46.4°F) and can grow up to 155 cm and 62.8 kg (61 inches and 138 lbs). This reef-associated species is found at depths of 5-30 m (16 to 98 ft) and feeds on small fishes and crustaceans.In Japan, it is prized as a food fish and commercially cultured.