Journal of National Fisheries University

PISSN : 0370-9361

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Journal of National Fisheries University Volume 71 Issue 4
published_at 2023-03

Growth of immature Japanese lates, Lates japonicus in the Tomouchi River of the Gokase estuary, Kyushu Island, Japan, by the mark and recapture method

個体識別法による五ヶ瀬川水系友内川におけるアカメ未成魚の成長
Kondou Takuya
Nagata Shingo
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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.
Creator Keywords
Growth
Japanese lates
Lates japonicus
Immature fish
Gokase estuary