Abstract
Variation in morphological characters was used to elucidate the stock structure of Scomber japonicus off Taiwan. Three samples including 139 individuals were collected from the south of the East China Sea (SECS), the waters off eastern Taiwan (ET), and the north of the South China Sea (NSCS). A total of 16 measurements were measured for each individual and size-standardized by multiple-group principal components analysis. The resulting measurements were tested with a canonical variate analysis, and clustered three samples into two groups: one included the SECS and samples, and the other the NSCS. Randomization tests showed that morphological difference between two groups was significant. There appear to be two morphologically distinguishable stocks of this species off Taiwan, but further verification of the stock structure may be essential.
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