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twait shad
The twait shad or twaite shad (''Alosa fallax'') is a species of fish in the Clupeidae family.〔 It is an anadromous fish which lives in the sea but migrates into fresh water to spawn.
==Description==
The twait shad is a typical herring-type fish and much resembles the allis shad. It has no lateral line and the belly is more rounded than that of the sprat and Baltic herring. The gill cover is ridged and the caudal peduncle has large, plate-like scales. This fish is more colourful than the Baltic herring. 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 there are a distinctive row of six to ten large dark spot just behind the gill cover though these may fade when the fish is dead. 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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