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- Takeshita Naohiko
Takeshita Naohiko
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Journal of National Fisheries University Volume 71 Issue 4
pp. 141 - 151
published_at 2023-03
Growth of immature Lates japonicus in eelgrass (Zostera japonica) beds of the Tomouchi River located at around 4.3 km upstream from the river mouth of the Gokase River, Kyushu Island, Japan was studied by the mark and recapture method and scale reading from September 1998 to March 2004. Newly occurring 0-year-old L. japonicus specimens of 13.9–78.0 mm SL (standard length) in Z. japonica beds of the Tomouchi River in August or September reached sizes ranging 58.8–125.7 mm SL by April and 203.4–232.8 mm SL between October and November of the following year. Monthly changes in specific growth rates of individuals demonstrated that rapid growth months of immature fish were limited to the period of high water temperature (22–28℃) from June to October. Also, it was supposed that the large-sized fish of the 0-year-old fish migrated away from Z. japonica beds after December, however a few fish remained in Z. japonica beds until the following November.
Creators :
Takeshita Naohiko
Kondou Takuya
Nagata Shingo
Takahashi Hiroshi
Publishers : National Fisheries University
Journal of National Fisheries University Volume 70 Issue 1
pp. 27 - 34
published_at 2021-10
The Japanese lates, Lates japonicus is an endemic fish to the Pacific coast of southern Japan, and commonly found in estuaries and coastal waters of Miyazaki and Kochi Prefectures. The larvae, juveniles and young fish stay in the eelgrass, Zostera japonica beds in brackish water areas. Effects of water temperature and salinity on feeding and growth of immature L. japonicus were studied using combinations of seven levels of temperatures (16 to 28℃) and 6 different salinities (9 to 34 ppt) over two experimental periods each of 30 days. At each of these conditions, ten fish were reared in aquaria for periods of 30 days. Based on values of the daily feeding rates, specific growth rates and feeding efficiencies, we found that immature L. japonicus were euryhaline and at salinities ranged from 9 to 34 ppt showed similar feeding and growth rates. The suitable water temperature range was 22 to 28℃, and the optimal water temperature range was 26 to 28℃ for feeding and growth for immature L. japonicus.
Creators :
Takeshita Naohiko
Kondou Takuya
Ikeda Itaru
Takahashi Hiroshi
Nagata Shingo
Hoshino Kazuo
Publishers : National Fisheries University
Journal of National Fisheries University Volume 69 Issue 1
pp. 17 - 23
published_at 2020-11
Creators :
Takeshita Naohiko
Hatooka Fumitaka
Uehara Takashi
Ogi Tama
Hamada Toshinori
Ikeda Itaru
Publishers : National Fisheries University
Journal of National Fisheries University Volume 67 Issue 4
pp. 263 - 268
published_at 2019-03
Creators :
Takeshita Naohiko
Hamada Toshinori
Hatooka Fumitaka
Uehara Takashi
Ogi Tama
Ikeda Itaru
Publishers : National Fisheries University
水産大学校研究報告 Volume 47 Issue 1
pp. 15 - 21
published_at 1998-09
水産大学校研究報告 Volume 52 Issue 3
pp. 113 - 112
published_at 2004-03
Creators :
Hamano Tatsuo
Fukuizumi Hiromu
Araki Akira
Takeshita Naohiko
Watanabe Toshiaki
Yokota Motohiro
Publishers : 水産大学校
水産大学校研究報告 Volume 52 Issue 2
pp. 83 - 92
published_at 2004-03
Journal of National Fisheries University Volume 57 Issue 1
pp. 1 - 8
published_at 2008-10
Creators :
Kosaka Shogo
Takeshita Naohiko
Yamamoto Ken-ichi
Ikeda Itaru
Publishers : National Fisheries University
Journal of National Fisheries University Volume 62 Issue 1
pp. 13 - 18
published_at 2013-09