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上五島近海産マアジ生殖巣の季節的変化について


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Title: 上五島近海産マアジ生殖巣の季節的変化について
Other Titles: On the seasonal variation of the gonads of jack-mackerels caught from the adjacent water of Northern Gotô-Isles
Authors: 水江, 一弘 / 古賀, 重行 / 松尾, 昭良
Authors (alternative): Mizue, Kazuhiro / Koga, Shigeyuki / Matsuo, Akira
Issue Date: 28-Feb-1958
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.6, pp.22-26; 1958
Abstract: In order to determine the spawning season of japanese jack-mackerels Trachurus japonicus (TEMMINEK et SCHLEGEL) caught from the adjacent water of northern Gotô-Isles., we obtained the fishes at the Sasebo Fish-Market every month from Apr. 1955 to Mar. 1957, and examined the monthly variation of gonad maturity. The weight of testis and ovary (gonad index=weight of gonad/fork length³×10a) and frequency distribution of diameter of the ovarian eggs were measured. From Fig. 1 and Fig. 2, we concluded that the jack-mackerel in the adjacent water of northern Gotô-Isles. seems to spawn three times a year, that is; a) the firs spawning…middle decade of February~first decade of March b) the second spawning…middle decade of April~first decade of May c) the third spawning…middle decade of July~last decade of July and the second spawning is most vigorous. The gonad index of the males is ordinarily smaller than that of the females, but in spawning season this relation is reverse. / 1)1955年4月-1957年3月まで佐世保魚市場に水揚げされた上五島産マアジに就て大体毎月,その生殖腺熟度を検討し産卵期を推定した.2)即ち雄に於ては精巣重量(生殖腺指数)を,雌に於ては重量及び卵巣内卵の直径を測定して生殖腺熟 度の月別変化を出した結果,上五島近海に於てはマアジは2月中旬~3月上旬… …第一回 4月中旬~5月初旬… …第二回 7月中旬~7月下旬… …第三回 の産卵を行い,その内第二回目が最も盛である.3)生殖腺指数は普通の時期では常に雄は雌よりも小であるが,産卵に関係の有ると思はれる時期に於ては常に雄は雌より大である.
URI: http://hdl.handle.net/10069/31921
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第6号

Citable URI : http://hdl.handle.net/10069/31921

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