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threadfin shad
The threadfin shad (''Dorosoma petenense'') is a small pelagic fish common in rivers, large streams, and reservoirs of the Southeastern United States. Like the American gizzard shad, the threadfin shad has an elongated dorsal ray, but unlike the gizzard shad its mouth is more terminal without projecting upper jaw. The fins of threadfin shad often have a yellowish color, especially the caudal fin. The back is grey to blue with a dark spot on the shoulder. ''D. petenense'' is more often found in moving water, and is rarely found deep in the water column. It occur in large schools, sometimes with gizzard shad, and can be seen on the surface at dawn and dusk. The threadfin shad may reach lengths of 8 inches, but only rarely. This fish is very sensitive to changes in temperature and dissolved oxygen, and die-offs are frequent in late summer and fall, especially when water temperature reaches 42 °F. The threadfin shad is a favorite food for many game fishes including striped bass, largemouth bass, smallmouth bass, and catfishes. This fish is widely introduced throughout the United States as a forage for game fish.
==Geographic distribution==
The threadfin shad is native to the U.S. west of the eastern Appalachian Mountains. This species tends to do best in large lakes and rivers. The construction of dams has created more reservoirs, providing more water bodies for the shad to inhabit. This has expanded the home range of the fish, as has the rise in temperatures in northern lakes.〔Green, B. W., et al. (2010). (Threadfin shad impacts phytoplankton and zooplankton community structures in channel catfish ponds. ) ''Aquaculture Research'' 41:e524-e536.〕
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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