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allis shad
The allis shad (''Alosa alosa'') is a widespread Northeast Atlantic species of fish in the herring family Clupeidae. It is an anadromous fish which migrates into fresh water to spawn.〔
==Description==
The allis shad is a typical herring-type fish. It has no lateral line and a somewhat rounded belly. The gill cover is ridged and the scales large. The back is a bluish-green colour and the head brownish with a golden tinge on the operculum. The flanks are silvery, sometimes with a bronzy tinge, and a distinctive large dark spot occurs just behind the gill cover, and occasionally one to six smaller spots behind that. The adult length is typically .〔(【引用サイトリンク】title=Allis shad: ''Alosa alosa'' )〕〔
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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