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薩南海域産ゴマサバの産卵期の考察 A Consideration on the Spawing-season of the Mackerel (Pneumatophorus tapeinocephalus) in the Southern Sea of Kyushu 田ノ上, 豊隆 TANOUE, Toyotaka open access About the spawning-season of mackerel (P. tapeinocephalus) in the southern sea of Kagoshima and the Eastern sea of China (South of 29°N lat.) the following results were derived from some repeated nvestigations on the state of the gonad index (G. W. x 103/B. L.3) ; the body length distribution of young mackerel per month ; total-length of the collected larva ; and the sea-conditions of fishing ground. 1) In the neighbourhood of the southern sea of Kagoshima, the spawning season of mackerel (P. tapeinocephalus) is to be fixed within the term from the end of January to that of April, but rarely in the exceptional year it may be extended to the month of May. The range of the water-temperature and salinity appropriate to the spawning is fixed to be 18 —23°C ; 34.3 —34.7 % respectively. 2) In the Eastern sea of China (South of 29°N lat.), the spawning season of P. tapeinocephalus lies within the term from the end of January to that of April. 鹿児島大学 Kagoshima University 1956-12-30 jpn departmental bulletin paper VoR http://hdl.handle.net/10232/10732 https://ir.kagoshima-u.ac.jp/records/2124 0453087X AN00040498 鹿児島大学水産学部紀要 Memoirs of Faculty of Fisheries Kagoshima University 5 42 52 https://ir.kagoshima-u.ac.jp/record/2124/files/無題8.pdf application/pdf 1.1 MB 2016-10-27 1956-12-30