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Sheepshead minnow : ウィキペディア英語版
Sheepshead minnow

The sheepshead minnow or sheepshead pupfish (''Cyprinodon variegatus variegatus'') is a subspecies of ray-finned fish in the family Cyprinodontidae, the pupfishes. It is found in salt marsh and estuary environments and is native to the eastern coasts of North and Central America.
==Description==
The sheepshead minnow is a deep-bodied fish growing to a length of up to though a more normal length is . It is nearly half as deep as it is long, excluding its tail. It is laterally compressed with flat sides, an arched back and a small head with a flattened top. The small mouth is at the end of the snout and the teeth are large and wedge-shaped with three cusps. The pectoral fins are large and extend past the origins of the small pelvic fins. The origin of the anal fin hardly overlaps the trailing edge of the dorsal fin. The caudal peduncle is thick and the caudal fin is truncated and square-ended. The arrangement of the fins, the deep body and the tri-cuspid teeth help to distinguish this fish from the mummichog (''Fundulus heteroclitus''), which is found in the same habitats. The body is covered by large, circular scales, the ones on the cheeks and the top of the head and a single scale just above the pectoral fin being the largest. The male is generally larger and more deep-bodied than the female, with larger dorsal, pelvic and anal fins.
The color of the sheepshead minnow is olive green above and yellowish below. Juveniles have irregular transverse dark bars and the females keep these as they mature, while the males lose theirs. The dorsal fin is dark while the pectoral, pelvic and anal fins are orange. During the breeding season the male becomes very colorful with steel blue upper parts in front of the dorsal fin, lustrous green upper parts behind and deep salmon-pink underparts.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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