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Preliminary study on homing,site fidelity,and diel movement of black rockfish Sebastes inermis measured by acoustic telemetry
Authors:Hiromichi Mitamura  Keiichi Uchida  Yoshinori Miyamoto  Nobuaki Arai  Toshiharu Kakihara  Takashi Yokota  Junichi Okuyama  Yuuki Kawabata  Tohya Yasuda
Affiliation:(1) Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan;(2) Department of Ocean Science, Faculty of Marine Science, Tokyo University of Marine Science and Technology, Minato Tokyo, 108-8477, Japan;(3) Present address: Graduate School of Agriculture, Kinki University, Nakamachi 3327-204, Nara 631-8505, Japan
Abstract:Several species of fish exhibit strong homing ability and distinct site fidelity to their original habitats and spawning sites. We have studied the homing ability, site fidelity, and diel movement patterns of three nocturnal black rockfish Sebastes inermis. The patterns were studied by radio-linked acoustic positioning system (VRAP) and fixed monitoring receivers (VR2) in Maizuru Bay, Japan from June to July 2004. All tagged fish were displaced by 80–120 m, but they returned to their respective captured sites at dusk, regardless of the time of release. The fish tagged with a depth sensor transmitter displayed active vertical movement just after the release, and subsequently swam near the bottom depth around the captured site. After homing, they displayed small home ranges [average 815 ± 265 m2 (SD)] around a single rocky area with one or two core areas (average 64 ± 30 m2). One core area was utilized during the daylight and dark periods, whereas the other was used primarily during the dark period. The depth-tagged fish primarily used the depth of the rock crevice during the daylight, and it spent its dark period between the surface and the deeper bottom depth.
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