2024-03-29T12:05:55Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02006941
2022-10-31T03:12:00Z
1642837622505:1642837994858:1642837997178
1642838403551:1642838406414
Observations of the Reproductive Cycle of Petrolisthes japonicas (de Haan) (Anomura: Porcellanidae)
Nakasone, Yukio
仲宗根, 幸男
open access
The reproductive cycle of Petrolisthes japonicus (de Haan) was studied in Fukuoka during 1966-67. 1) The ovigerous females were found in the crab population from the end of May to the beginning of November. The reproductive season was approximately five months. 2) The females of the species produced three broods per year and the egg deposition occurred at every about six weeks during the reproductive season. The females had ova which will produce fourth brood, but their ova were not able to develop into eggs, probably because of low water temperature and were absorbed. 3) The start of maturity in the females occurred at about 4.1 mm in carapace length, although a single ovigerous female (3. 3mm) less than 1.1 mm was found in the samples. Ovigerous females ranged from 3.8 to 8.5 mm in carapace length and from 30 to 381 in the number of eggs. 4) The females of the species may incubate in a year after hatching.
紀要論文
琉球大学理工学部
Science and Engineering Division, University of the Ryukyus
1972-03-01
eng
departmental bulletin paper
NA
http://hdl.handle.net/20.500.12000/23471
http://hdl.handle.net/20.500.12000/23471
https://u-ryukyu.repo.nii.ac.jp/records/2006941
AN0025080X
琉球大学理工学部紀要. 理学編
Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural sciences
15
127
135
https://u-ryukyu.repo.nii.ac.jp/record/2006941/files/No15p127.pdf