Effect of shelter acclimation on the post-release movement and putative predation mortality of hatchery-reared black-spot tuskfish <Emphasis Type="Italic">Choerodon schoenleinii</Emphasis>, determined by acoustic telemetry |
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Authors: | Yuuki Kawabata Kimio Asami Masato Kobayashi Taku Sato Koichi Okuzawa Hideaki Yamada Kenzo Yoseda Nobuaki Arai |
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Institution: | (1) Graduate School of Informatics, Kyoto University, Sakyo, Kyoto 606-8501, Japan;(2) Ishigaki Tropical Station, Seikai National Fisheries Research Institute, Fisheries Research Agency, Ishigaki Okinawa, 907-0451, Japan;(3) Present address: Institute for East China Sea Research, Nagasaki University, Taira-machi, Nagasaki 851-2213, Japan;(4) National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Hatsukaichi Hiroshima, 739-0452, Japan;(5) National Research Institute of Aquaculture, Fisheries Research Agency, Minami-ise Mie, 516-0193, Japan |
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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. |
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