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chub mackerel
The chub mackerel, Pacific mackerel, or Pacific chub mackerel (''Scomber japonicus'') is a mackerel which closely resembles the Atlantic chub mackerel.
==Characteristics==
The chub mackerel has a well-developed swim bladder attached with the esophagus, which the "true mackerels" in the ''Scomber'' genus lack, and a characteristic color difference is seen between the chub and the Atlantic chub, the latter being silvery-sided below the midline, whereas the lower part of the sides of the chub (otherwise colored somewhat like the Atlantic) are mottled with small dusky blotches, and the chub has a larger eye than the Atlantic. Less obvious differences are that the dorsal fins are closer together in the chub and only 9 or 10 spines are in its first dorsal fin instead of 11 or more, which is the usual count in the Atlantic mackerel. In most species, the mackerel is known to travel in large schools. It is a smaller fish than its better-known relatives, growing to a length around 8 to 14 in.
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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