| Rex sole | |
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Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Carangiformes |
| Suborder: | Pleuronectoidei |
| Family: | Pleuronectidae |
| Genus: | Glyptocephalus |
| Species: | G. zachirus |
| Binomial name | |
| Glyptocephalus zachirus Lockington, 1879 | |
| Synonyms | |
Errex zachirus(Lockington, 1879) | |
Therex sole (Glyptocephalus zachirus) is aflatfish of the familyPleuronectidae. Locally, it may also be known as awitch orthreadfin sole (due to the filamentous pelvic fin on the eyed surface). It is ademersal fish that lives intemperate waters on sand or mud bottoms at depths of up to 900 metres (3,000 ft), though it is most commonly found between 61 and 500 metres (200 and 1,640 ft). Its native habitat is the northernPacific, fromBaja California inMexico up the coasts of theUnited States,British Columbia andAlaska, across theBering Sea to the coast ofRussia and theSea of Japan. It is slow-growing, reaching up to 60 centimetres (24 in) in length (though its average length is 36 centimetres (14 in)), and it can weigh up to 2.0 kilograms (4.4 lb). Maximum reported lifespan is 24 years.[1][2]
The rex sole is a right-eyed flounder with an elongate, oval-shaped body and a small mouth. Its upper surface is uniform in colour, light brown to grey, with small scales; its underside is off-white. The dorsal and ventral fins on the upper side are dark, and the pectoral fin is long and mostly black. The caudal fin is rounded. The lateral line is nearly straight.[3]
The rex sole's diet consists ofbenthosinvertebrates such ascrustaceans,worms,shrimps andcrabs.[1][2]
The rex sole is fished commercially, and its flesh is considered tasty. Commercial fishing is conducted bytrawler and the fish comprises a major part of the flatfish trawl fishery from California northward to the Bering Sea.[1][2][3]
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