Association of early juvenile yellowfin tuna <Emphasis Type="Italic">Thunnus albacares</Emphasis> with a network of payaos in the Philippines |
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Authors: | Yasushi Mitsunaga Chikayuki Endo Kazuhiko Anraku Jr" target="_blank">Cornelio M SelorioJr Ricardo P Babaran |
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Institution: | (1) Faculty of Agriculture, Kinki University, 204-3327 Nakamachi, Nara 631-8505, Japan;(2) Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima 890-0056, Japan;(3) College of Fisheries and Ocean Sciences, University of the Philippines Visayas, Miagao, 5023 Iloilo, Philippines |
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Abstract: | To understand how early juvenile yellowfin tuna use the habitat and environment provided by fish aggregating devices (FADs),
fish (19–31 cm FL) implanted with ultrasonic transmitters into their abdominal cavities were released in a network of payaos
in Panay Gulf, the Philippines. Self-recording receivers were attached to the anchor ropes of the payaos to detect the presence
of the fish. Some aspects of the behavior of juveniles were similar to those reported in adults. One juvenile showed a diurnal
vertical swimming pattern, swam within a limited shallow range during the nighttime, and dived to deeper waters during the
daytime. Two juveniles performed deep dives over 100 m during payao-to-payao excursion. Three juveniles showed a diurnal horizontal
swimming pattern that was synchronized. In contrast, juveniles stayed <6 days in the network, shorter than adults. No juveniles
returned to the same payao after an interruption of over 24 h. It is suggested that juveniles in this area are just starting
to migrate and are temporarily staying around a payao for a few days to forage before continuing their migration. |
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