著者

野崎 真澄 堤 俊夫 小林 英司 竹井 祥郎 市川 友行 常木 和日子 宮川 和子 上村 晴子 辰己 佳次

出版者

日本動物学会

雑誌

動物学雑誌 (ISSN:00445118)

巻号頁・発行日

vol.85, no.2, pp.p156-168, 1976-06

被引用文献数

3

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The spawning habit of the puffer, Fugu niphobles (Jordan et Snyder), was observal at Arai Beach and Aburatsubo Inlet from late May to early August in 1975. One spawning ground was found at Arai Beac (A in Fig.1), and four at Aburatsubo Inlet (B-E in Fig.1). The puffer laid eggs on any spawning bed with sandy (A), pebbly (B, C and D) or rocky shores (E). They spawned at beaches facing any direction (Fig.1). The spawning season extended from May 25 to July 28. Spawning ran 5-7 days at Arai Beach, and 2-6 days at Aburatsubo Inlet following each full or new moon. A large school of puffers, consisting of about 1000, approached each spawning bed with the rising tide. Spawning took place repeatedly in small groups of 10-60 puffers only in the evening high tide. Each spawning observed at Arai Beach started 110±6 minutes and finished 39±8 minutes before the full tide, except for the first day. Thus, most of the eggs were washed away from the beach by waves. The number of spawnings by small groups ws very small on the first day and became highest on the 3rd or 4th day. There was no difference in total length between males and females found at the spawning beds. The number of females was notably less than males. A large school of puffers approached the spawning beds with the rising tide in the morning, but spawning was not observed.