九州大学大学院農学研究院動物資源科学部門海洋生物生産学講座海洋生物学研究室
Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresources Science, Faculty of Agriculture, Kyushu University
九州大学大学院農学研究院動物資源科学部門海洋生物生産学講座海洋生物学研究室
Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresources Science, Faculty of Agriculture, Kyushu University
水産庁西海区水産研究所 | 九州大学大学院農学研究院動物資源科学部門海洋生物生産学講座海洋生物学研究室
Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresources Science, Faculty of Agriculture, Kyushu University | Seikai National Fisheries Research Institute
水産庁西海区水産研究所 | 九州大学大学院農学研究院動物資源科学部門海洋生物生産学講座海洋生物学研究室
Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresources Science, Faculty of Agriculture, Kyushu University | Seikai National Fisheries Research Institute
九州大学大学院農学研究院動物資源科学部門海洋生物生産学講座海洋生物学研究室
Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresources Science, Faculty of Agriculture, Kyushu University
都城工業高等専門学校 | 九州大学大学院農学研究院動物資源科学部門海洋生物生産学講座海洋生物学研究室
Miyakonojo National College of Technology | Laboratory of Marine Biology, Division of Marine Bioresources, Department of Animal and Marine Bioresources Science, Faculty of Agriculture, Kyushu University
This study investigaled the optimal hard structure for use as a marker in age determination from eight hard structures, and age and growth of the whitefin jack Kaiwarinus equula. Specimens were collected in the East China Sea during the period from April 1996 to March 1997. Length frequency distributions showed that most specimens of both males and females ranged from 165 to 185 mm in fork length (FL). Vertebral centra were chosen as the optimal hard structure for use as a marker in age determination among the vertebral centra, scales, otoliths, opercles, preopercles, interopercles, actinosts and urohyals. Monthly changes in the frequency of appearance of a translucent band on the outer inargin of the centrum and in the marginal increments indicated that ring marks formed twice a year, from March through April and from September through October. Ring mark formed between September and October could be considered as an age mark. Male specimens possessed 2-14 ring marks while females had 2-13 ring marks. Using the back-calculated forlt lengths at the lime of age mark formation, growth of males was expressed as FLt=273(1-exp { -0.270(t+0.213) })(1? t ? 7) and FLt=272(1-exp { -0.286(t+0.111) } ) (1 ? t ? 6) for females. Our results suggested that the growth trends and lifespan of both sexes were similar.