Giant hawkfish
Largest hawkfish, found in eastern Pacific reefs.
The giant hawkfish (Cirrhitus rivulatus), also called the hieroglyphic hawkfish, is a marine ray-finned fish belonging to the family Cirrhitidae. It holds the title of the largest hawkfish species, with a maximum total length of 60 cm (24 in). The heaviest published weight is 4.2 kg (9.3 lb), though the International Game Fish Association recognizes a 5.58 kg (12.3 lb) specimen caught off Ecuador in 2019.
French zoologist Achille Valenciennes first formally described this species in 1846, using a type specimen from the Galápagos Islands. Its specific name, *rivulatus*, means "marked by irregular streaks," referring to the black-edged, golden-brown markings on the body, which are surrounded by thin cobalt-blue borders.
The giant hawkfish has a deep body that is not strongly flattened side-to-side. Its head is large with a blunt snout, and a fringe of cirri (small, fleshy filaments) lines the rear edge of the front nostril. The mouth is moderately large, with two types of teeth: an outer row of canines and an inner row of villiform (brush-like) teeth, plus teeth on the roof of the mouth. The upper edge of the preoperculum may have small serrations or be smooth, and the gill cover bears two flattened spines. The continuous dorsal fin has 10 spines (each tipped with a large tuft of cirri, and the membranes between them are deeply notched) followed by 11–12 soft rays, with a small notch separating the spiny and soft-rayed sections. The anal fin has 3 spines and 5–7 soft rays, and the caudal fin is truncate (square-cut). The lower seven pectoral fin rays are robust, with deeply incised membranes, and are notably longer than the other pectoral rays; the uppermost ray and the lower seven rays are unbranched. The pelvic fin, originating behind the pectoral fin base, has one spine and five soft rays. Scales are smooth; the area between the eyes lacks scales, and the cheeks have fewer than 12 irregular rows of small scales. The lateral line contains 41–49 scales. Overall color is greyish brown, with five vertical bars on the body, each composed of complex golden-brown markings edged in black and then bright blue. The head has thick, golden-brown bands with black margins and slender blue borders radiating from the eyes. Most individuals have a pair of white spots on the rear part of the back. Juveniles are white with dark brown bars.
Quick Facts
- Taxon
- Cirrhitus rivulatus
Facts from the source article.
Lore & Background
The giant hawkfish was first formally described in 1846 by French zoologist Achille Valenciennes, with the type locality given as the Galápagos Islands. Its specific name rivulatus means 'marked by irregular streaks', referring to the black-edged, golden-brown markings on the body with thin cobalt-blue surrounds. The species has a deep body, large head with blunt snout, and a fringe of cirri on the posterior margin of the anterior nostril. Its dorsal fin has 10 spines with deep notches between them, each spine tip bearing a large tuft of cirri, and 11-12 soft rays. The lower 7 pectoral fin rays are robust and notably longer than the others, with deeply incised membranes. The overall color is greyish brown with five vertical bars made of golden-brown markings, each with a black margin and narrow bright blue edges. Most individuals have a pair of white spots on the posterior part of the back, while juveniles are white with dark brown bars.
Reader's Guide
The giant hawkfish is endemic to the eastern Pacific Ocean, ranging from southern Baja California and the northern Sea of Cortez to Ecuador, including all offshore islands. It inhabits shallow reefs down to 30 m (98 ft), with juveniles found in the surge zone and tidal pools. A solitary, benthic species, it lies still on rock ledges where its body pattern provides camouflage. It perches on its pectoral fins when sitting on rocks. Its diet includes small fishes, crustaceans, and even small marine iguanas (Amblyrhynchus cristatus). In southern Baja California, it undertakes seasonal movements into shallower water when water temperature rises, typically in May. As the largest hawkfish, it is a notable predator in its reef ecosystem, and its distinctive coloration and fin morphology make it a recognizable species within the family Cirrhitidae.
Did You Know?
- The giant hawkfish is the largest species in the hawkfish family, reaching 60 cm (24 in) in total length.
- Its specific name rivulatus means 'marked by irregular streaks', referring to its golden-brown markings with black edges and blue surrounds.
- The International Game Fish Association recognizes a specimen of 5.58 kg (12.3 lb) caught in 2019 off Ecuador.
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