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Agosia chrysogaster chrysogaster
== Description ==
The Gila Longfin Dace (Agosia chryogaster chryogaster), is the only ''Agosia'' species found in Arizona. The only other form of fish closely related to ''Agosia'' is the Rio Yaqui, which also occurs in Arizona. The body is “fusiform,” meaning that it is spindle-shaped (wide in the middle and tapers at both ends). The scales are small. A typical ''Gila Dace'' has an average length of 3.5 inches. Their mouths are small and oblique, with a very bluntly shaped snout and head. The nares or outer “nostrils” of the fish direct water toward the gills and define the termination of the mouth. The ''Gila Dace'' is easily distinguishable from other cyprididae by the lack of dark spots normally located on the triangular dorsal fin. There is however, a large black spot at the base of the caudal fin. This fish is typically silvery gray dorsally and olive ventrally, with the absence of gold speckles found on its relative, the Yaqui Longfin Dace.〔Minckley, W. L. 1973. Fishes of Arizona. Arizona Game and Fish Department, Phoenix. pp. 126-128〕 〔Minckley, W.L. and W.E. Barber. 1971. Some aspects of biology of the longfin dace, a cyprinid fish characteristic of steams in the Sonoran Desert. Southwest Naturalist 15(4): 459-564〕 〔Hendrickson, D.A., W.L. Minckley, R.R. Miller, et al. 1980. Fishes of the Rio Yaqui Basin, Mexico and United States. Journal of the Arizona-Nevada Academy of Science 159(3): 73.〕 〔Kepner, W.G. 1982. Reproductive biology of longfin dace (Agosia chrysogaster) in a Sonoran desert stream, Arizona. Arizona State University masters thesis. pp. 72.〕
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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