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Phenotypic changes in reproductive traits with changes in stock size of the starspotted smooth-hound Mustelus manazo in Tokyo Bay, Japan

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Abstract

Reproductive traits are among the primary determinants of population dynamics, and their changes could affect stock size. We investigated differences in reproductive traits of the starspotted smooth-hound Mustelus manazo in Tokyo Bay between the 1990s (a low-stock period) and the 2000s (a high-stock period). Peak timings of mating (May–July), ovulation (May–June), and parturition (May–June) were similar between the two periods. However, the size at first maturity in the 2000s was smaller than that in the 1990s for both sexes. In addition, embryo-related parameters differed greatly between the two periods. Slopes of size–fecundity regression in the 2000s decreased to 43–73 % of the 1990–1996 values, suggesting a substantial decline in fecundity during the 2000s. Frequency distribution of the maximum ovum diameter during the ovulation season showed two distinct two modes in 1990s while it showed a substantial dispersion during the 2000s, implying that changes occurred in the developmental pattern of ova in the ovary. Undeveloped eggs were present in the uteri with low frequency from September to May during the 2000s, but they were totally absent from September through May in the 1990s. The increased number of remnant undeveloped eggs that did not become embryos may explain the fecundity decline during the 2000s.

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Acknowledgments

We thank Mr. Saburo Hirano, fisherman, Chiba Prefecture, for his help in collecting the specimens in Tokyo Bay.

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Author notes

  1. Jeong-Hoon Lee

    Present address: Southeast Sea Fisheries Research Institute, National Fisheries Research and Development Institute, Tongyeong, Gyeongnam, 650-943, Korea

Authors and Affiliations

  1. The United Graduate School of Veterinary Science, Yamaguchi University, Yoshida, Yamaguchi, 753-8511, Japan

    Jeong-Chae Park

  2. Center for Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan

    Jeong-Chae Park, Masaaki Oyama, Jeong-Hoon Lee, Keita Kodama, Hiroaki Shiraishi & Toshihiro Horiguchi

  3. Laboratory of Experimental Animals, Department of Veterinary Medicine, Faculty of Agriculture, Tottori University, Koyama, Tottori, 680-8553, Japan

    Yasuhiko Ohta

  4. Faculty of Fisheries, Nagasaki University, Nagasaki, Nagasaki, 852-8521, Japan

    Atsuko Yamaguchi

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  1. Jeong-Chae Park
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  2. Masaaki Oyama
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Correspondence to Toshihiro Horiguchi.

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Park, JC., Oyama, M., Lee, JH. et al. Phenotypic changes in reproductive traits with changes in stock size of the starspotted smooth-hound Mustelus manazo in Tokyo Bay, Japan. Fish Sci 79, 193–201 (2013). https://doi.org/10.1007/s12562-012-0580-7

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  • DOI: https://doi.org/10.1007/s12562-012-0580-7

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