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Temperature-induced variation in sexual maturation of Japanese anchovy Engraulis japonicus

Published online by Cambridge University Press:  10 April 2015

Michio Yoneda*
Affiliation:
National Research Institute of Fisheries and Environment of Inland Sea, Hakatajima Station, Imabari 794-2305, Japan
Masayuki Yamamoto
Affiliation:
Kagawa Prefectural Fisheries Experiment Station, Yashima-higashi, Takamatsu 761-0111, Japan
Tetsuo Yamada
Affiliation:
National Research Institute of Fisheries and Environment of Inland Sea, Hakatajima Station, Imabari 794-2305, Japan
Makoto Takahashi
Affiliation:
National Research Institute of Fisheries and Environment of Inland Sea, Hakatajima Station, Imabari 794-2305, Japan
Yasuhiro Shima
Affiliation:
Seikai National Fisheries Research Institute, Goto Station, Tamanouramachi-Nunoura Goto 853-0508, Japan
*
Correspondence should be addressed to: M. Yoneda, National Research Institute of Fisheries and Environment of Inland Sea, Hakatajima Station, Imabari 794-2305, Japan email: myoneda@fra.affrc.go.jp

Abstract

Temperature is one of the most influential factors for the sexual maturation of fishes, but understanding of the extent to which temperature affects the maturational schedules is limited in multiple-spawning fishes over a protracted season. This study examined the effect of temperature on sexual maturation of Japanese anchovy Engraulis japonicus siblings under high and low temperature regimes on different birthdates. The maturation probability differed between the two temperature regimes. Specimens in high temperature regimes matured at much smaller size and younger age than their counterparts. Also, a significant difference in the maturation probability between sexes was found at low temperatures, but not at high temperatures. Our findings show that temperature affects the maturational schedules of siblings of Japanese anchovy, suggesting that the size and age at sexual maturation could differ among cohorts, even in a given sampling location and/or year.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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