Abstract
North Pacific armorhead Pentaceros wheeleri specimens collected through pelagic surveys in the North Pacific were analyzed to estimate the distribution, hatching season, growth, and the duration of the epipelagic life stage. Most pelagic specimens were collected in the central and eastern North Pacific (36–50°N, 178°E–137°W). This area was considered to be the nursery ground where larvae and juveniles inhabit until subsequent settlement to seamounts. The pelagic specimens were aged 0, 1, and 2 years, and their hatching periods were estimated to be from December to February based on the analysis of daily growth increments of otoliths. Standard length-at-age data were fitted to the mixed model of the von Bertalanffy growth curves, and growth coefficients L ∞, k, and t 0 were estimated to be 308 and 290 mm, 0.909 and 1.055, and 0.183 and 0.256 years for males and females, respectively. The standard length of fish at age 2.5 years was estimated at 263–271 mm, which is close to the size of demersal fish commonly harvested from the southern Emperor-northern Hawaiian Ridge seamounts. Since only a few age 3 fish were collected in pelagic samples, presumably most individuals shift to demersal life on seamounts before age 3.
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Acknowledgments
We thank Takashi Yanagimoto of the National Research Institute of Fisheries Science for help in sample collection and otolith analysis, and Hiromichi Ueno of Hokkaido University for comments on oceanographic conditions in the North Pacific Ocean, and Hiroshi Okamura of the National Research Institute of Fisheries Science for his advice on the use of mixed models for the growth curve analysis. We also thank the editor and two anonymous referees of this journal for their helpful comments and suggestions on the manuscript. This study was conducted as a part of NEOPS (New Ocean Paradigm on its Biogeochemistry, Ecosystem, and Sustainable Use) supported by a Grant-in-Aid for Scientific Research (No. 4403-A03-2412008) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan, and the project on the evaluation of the status of international fishery resources by the Fisheries Agency of Japan.
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An erratum to this article is available at http://dx.doi.org/10.1007/s12562-016-1039-z.
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Murakami, C., Yonezaki, S., Suyama, S. et al. Early epipelagic life-history characteristics of the North Pacific armorhead Pentaceros wheeleri . Fish Sci 82, 709–718 (2016). https://doi.org/10.1007/s12562-016-1002-z
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DOI: https://doi.org/10.1007/s12562-016-1002-z