Fisheries Science

, 77:345 | Cite as

Effect of shelter acclimation on the post-release movement and putative predation mortality of hatchery-reared black-spot tuskfish Choerodon schoenleinii, determined by acoustic telemetry

  • Yuuki Kawabata
  • Kimio Asami
  • Masato Kobayashi
  • Taku Sato
  • Koichi Okuzawa
  • Hideaki Yamada
  • Kenzo Yoseda
  • Nobuaki Arai
Original Article Biology

Abstract

In this study, the effect of shelter acclimation on the post-release movement and putative predation mortality of hatchery-reared black-spot tuskfish Choerodon schoenleinii was examined using acoustic telemetry. We acclimated four 1-year-old fish to shelters in cages before release and compared their movements with six nonacclimated fish. Since it was not possible to compare the behavioral pattern between the former and the latter fish due to the short periods the latter fish were available to be monitored, we also compared their movements with those of large nonacclimated fish that were less likely to be preyed upon. Sixty-seven percent of the nonacclimated fish showed atypical movements before the signals ceased to be detected, a pattern that suggested a predation event had occurred, whereas none of the acclimated and large nonacclimated fish showed the atypical movements. In addition, the probability of detection cessation was about 13 times lower in the acclimated than nonacclimated fish. The signal detection patterns suggest that the acclimated fish utilized night-time shelters from the first night after release, while the large nonacclimated fish started to utilize shelters several days after release. Therefore, it is likely that the shelter acclimation enhanced the shelter utilization by tuskfish, possibly decreasing post-release predation mortality.

Keywords

Biotelemetry Captive-bred Cox proportional hazards model Learning Restocking Stock enhancement Survival analysis 

Notes

Acknowledgments

We thank T. Takebe, N. Hirai, T. Kurihara, A. Nanami, G. Suzuki, S. Arakaki, and other members of the Ishigaki Tropical Station, Seikai National Fisheries Research Institute, Fisheries Research Agency, for research assistance, valuable comments, and encouragement. We also thank I. Ohta at the Okinawa Prefectural Fisheries and Ocean Research Center for providing valuable information on the black-spot tuskfish and white-streaked grouper, and R. Masuda at the Maizuru Fisheries Research Station, Kyoto University, for providing helpful comments on determining experimental procedures. We wish to express appreciation to J. Okuyama, H. Kamihata, T. Hashiguchi, and other members at the Graduate School of Informatics for their research assistance and constructive comments. H. Mitamura, G.N. Nishihara, M. Sano, and anonymous reviewers provided valuable comments on the manuscript. This research was supported by a Grant-in-Aid for JSPS fellows to Y.K. (20-2242), Kyoto University Global COE Program: Information Education and Research Center for Knowledge-Circulation Society, and a grant from the Fisheries Research Agency, Japan.

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Copyright information

© The Japanese Society of Fisheries Science 2011

Authors and Affiliations

  • Yuuki Kawabata
    • 1
    • 3
  • Kimio Asami
    • 2
    • 4
  • Masato Kobayashi
    • 2
  • Taku Sato
    • 2
  • Koichi Okuzawa
    • 2
    • 5
  • Hideaki Yamada
    • 2
  • Kenzo Yoseda
    • 2
    • 4
  • Nobuaki Arai
    • 1
  1. 1.Graduate School of InformaticsKyoto UniversityKyotoJapan
  2. 2.Ishigaki Tropical Station, Seikai National Fisheries Research InstituteFisheries Research AgencyIshigakiJapan
  3. 3.Institute for East China Sea ResearchNagasaki UniversityNagasakiJapan
  4. 4.National Research Institute of Fisheries and Environment of Inland SeaFisheries Research AgencyHatsukaichiJapan
  5. 5.National Research Institute of AquacultureFisheries Research AgencyMinami-iseJapan

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