Genus of fishes
Archosargus is a genus of marine ray-finned fishes belonging to the family Sparidae, the sea breams and porgies. These fishes occur in the Western Atlantic and Eastern Pacific Oceans.
Taxonomy.
"Archosargus" was first proposed as a monospecific genus in 1865 by the American biologist Theodore Gill with "Sparus probatocephalus" as its only species. "S. probatocephalus" had originally been formally described in 1792 by the German naturalist Johann Julius Walbaum with its type locality not given but it is thought to be New York. The genus "Archosargus" is placed in the family Sparidae within the order Spariformes by the 5th edition of "Fishes of the World". Some authorities classify this genus in the subfamily Sparinae, but the 5th edition of Fishes of the World does not recognise subfamilies within the Sparidae.
Etymology.
"Archosargus" combines "archon", meaning “ruler”, and "sagrus", a Greek name for seabreams dating as far back as Aristotle, although in this case Gill was probably referencing "Sargus", a synonym of "Diplodus". Gill described "A. probatocephalus" as “pre-eminent among the Sparoids for the delicacy of its flesh as well as its size”.
Species.
"Archosargus" contains the following species:
"Archosargus aries" is a synonym of "Archosargus probatocephalus"
Characteristics.
"Archosargus" seabreams have oval rather compressed bodies with jumped backs, small heads and pointed snouts. Both the dorsal and ventral profiles of the head are convex. They have small mouths and the preorbital bone overlaps the rear of the maxilla. The teeth at the front of the jaw are broad and flattened, the upper jaw has three rows of molar-like teeth at the sides. The dorsal fin is long and not high and is supported by 12 spines, the front spine points towards the front and may be embedded. There are 3 short spines in the anal fin. The pectoral fins are much longer than the pelvic fins. The cheeks and gill covers are typically scaly but the snout is naked. The largest species in the genus is "A. probatocephalus" with a maximum published total length of while the smallest is A. rhomboidalis which has a maximum published total length of .
Distribution and habitat.
Archosargus seabreams are found in the Americas. Three species are found in the Western Atlantic,from Canada south to Brazil, with the fourth species, "A. pourtalesii" In the Galápagos Islands of the Eastern Pacific Ocean. These fishes are coastal, often entering brackish waters and even up into the freshwater of the lower reaches of rivers.
Fisheries.
"Archosargus" seabreams are fished for both commercially and recreationally. The smaller species are not highly valued as food fish but are used to make fish meal. The sheepshead ("A. probatocephalus") is caught as a food fish, subjected to overfishing in the past, and is again becoming more important to commercial fisheries in the Gulf of Mexico as more desirable species, like red drum ("Sciaenops ocellatus"), decrease through overfishing.
References.
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