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Atlantic sturgeon
The Atlantic sturgeon (''Acipenser oxyrinchus oxyrinchus'') is a North American member of the Acipenseridae family and is among the oldest fish species in the world. It is one of two subspecies of ''A. oxyrinchus'', the other being the Gulf sturgeon, ''A. o. desotoi''. The range of the Atlantic sturgeon extends from New Brunswick, Canada, to the eastern coast of Florida. It was in great abundance when the first settlers came to North America, but has since declined due to overfishing and water pollution. It is considered threatened, endangered, and even locally extinct in many of its original habitats. The fish can reach 60 years of age, in length and over in weight.
==Physical appearance==
Rather than having true scales, the Atlantic sturgeon has five rows of bony plates known as scutes. Specimens weighing over 800 lb and nearly 15 ft in length have been recorded, but they typically grow to be and no more than . Its coloration ranges from bluish-black and olive green on its back to white on its underside. It has a longer snout than other sturgeons and has four barbels at the side of its mouth.
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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