10月に魚釣島近海に出現したカジキ、サバに関する二、三の知見

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  • 10ガツ ニ ウオツリトウ キンカイ ニ シュツゲン シタ カジキ , サバ ニ カンスル ニ , サン ノ チケン
  • Some Notes on Marlin and Mackerel from the Waters of Uoturijima in October

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on the fishing test in the waters of Uoturijima in October, the following results were obtained : 1) At the Uoturijima Fishing Ground a large catch of Makaira mazara wasnoted. 2) It was considered that at the outside of 100-fathom line Makaira mazaraswam along the warm Kurosio current, while at the inside of the line Makaira marlina swam near between the warm water of upper part and the cold water of lower part, and marlin looked for mackerel and horse mackerel (Decapterus murodsi). 3) It was perceived that at the inside of the line mackerel (Scomber tapeinocephalus) swam in the cold water zoneand in the waters of 45 miles offNoth･west～west of Uoturijima. 4) In October, it seemed that many small-sized mackerels were found off shore, many large-sized were found in the coastal waters･ The quality indicator (W/L3 1030) of the former was 13.5-14.5, the latter was 14･0-15.0, and genitalglands were almost unripe.

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