本邦近海産サバの背部担鰭骨数について

概要

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1. The interneural spines of the mackerels from Japanese waters which are counted from a to b in Fig. 1 vary from twelve to twenty-three in number. The number frequency distribution of them is distinctly bimodal (Fig. 2 and Table 1). Accordingly, the present fish are divided into two groups by the number of interneural spines, one bearing the spines less than sixteen, while the other, more than seventeen. 2. In the group which bears the interneural spines less than sixteen, the spots on the lateral median line are non, or if present, some of them are in contact with each other or with the coloured band on the dorsal side of body. While in the other group which bears them above seventeen, such spots are distinct and independent (Fig. 3 and Table 4). Judging from the characters of spots, the former corresponds to Pneumatophorus japonicus, while the latter to P. tapeinocephalus. 3. The relation between the number of interneural spines and that of spinous rays of 1 ?? dorsal fin shows that it is inadequate to divide the mackerels into two species by the latter, namely to treat those which bear nine or ten spinous rays as P. japonicus and those which bear eleven or twelve ones as P. tapeinocephalus (Table 5-7).
社団法人日本水産学会の論文