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Alosa
''Alosa''〔(''Alosa'' Linck, 1790 ) ITIS〕 is a genus of fish, the river herrings, in the family Clupeidae. Along with other genera in the subgenus Alosinae, they are generally known as shads.〔(Alosinae ) ITIS〕〔(Subfamily Alosinae ) FAO Fisheries Bulletin〕 They are distinct from other herrings by having a deeper body and spawning in rivers. Several species can be found on both sides of the Atlantic Ocean and Mediterranean Sea. Also, several taxa occur in the brackish-water Caspian Sea and the Black Sea basin.〔 Many are found in fresh water during spawning and some are only found in landlocked fresh water. ==Appearance== ''Alosa'' species are generally dark on the back and top of the head, with blue, violet, or greenish tints.〔 However, some can be identified as having a grey or green back.〔 Spots are commonly found behind the head, and the fins may vary from species to species or individually.〔 Most species of ''Alosa'' weigh or less, with one species, ''A. pontica'', weighing up to 2 kg.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Alosa」の詳細全文を読む
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