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Fisheries Science

, Volume 79, Issue 2, pp 193–201 | Cite as

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

  • Jeong-Chae Park
  • Masaaki Oyama
  • Jeong-Hoon Lee
  • Keita Kodama
  • Yasuhiko Ohta
  • Atsuko Yamaguchi
  • Hiroaki Shiraishi
  • Toshihiro HoriguchiEmail author
Original Article Biology

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.

Keywords

Density dependence Elasmobranch Embryo Fecundity Mustelus manazo Phenotypic plasticity Reproduction Tokyo Bay 

Notes

Acknowledgments

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

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Copyright information

© The Japanese Society of Fisheries Science 2012

Authors and Affiliations

  • Jeong-Chae Park
    • 1
    • 2
  • Masaaki Oyama
    • 2
  • Jeong-Hoon Lee
    • 2
    • 5
  • Keita Kodama
    • 2
  • Yasuhiko Ohta
    • 3
  • Atsuko Yamaguchi
    • 4
  • Hiroaki Shiraishi
    • 2
  • Toshihiro Horiguchi
    • 2
    Email author
  1. 1.The United Graduate School of Veterinary ScienceYamaguchi UniversityYamaguchiJapan
  2. 2.Center for Environmental Risk ResearchNational Institute for Environmental StudiesTsukubaJapan
  3. 3.Laboratory of Experimental Animals, Department of Veterinary Medicine, Faculty of AgricultureTottori UniversityTottoriJapan
  4. 4.Faculty of FisheriesNagasaki UniversityNagasakiJapan
  5. 5.Southeast Sea Fisheries Research InstituteNational Fisheries Research and Development InstituteTongyeongKorea

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