Individual consistency between diel activity during rearing and behavior after release in red tilefish <Emphasis Type="Italic">Branchiostegus japonicus</Emphasis> revealed by laboratory observation and acoustic telemetry |
| |
Authors: | Takashi Yokota Reiji Masuda Hiroyuki Takeuchi Tatsuo Tsuzaki Nobuaki Arai |
| |
Institution: | Graduate School of Informatics, Kyoto University, Sakyo, Kyoto, Kyoto 606-8501,;Maizuru Fisheries Research Station, Kyoto University, Maizuru, Kyoto 625-0086,;Miyazu Station, National Center for Stock Enhancement, Fisheries Research Agency, Miyazu, Kyoto 626-0052, and;Tamano Station, National Center for Stock Enhancement, Fisheries Research Agency, Tamano, Okayama 706-0002, Japan |
| |
Abstract: | ABSTRACT: To determine characteristics which may reflect the behavioral quality of red tilefish Branchiostegus japonicus after release, five wild and four hatchery-reared fish were observed in a laboratory and in the sea. The diel activity of the fish was recorded on video tape for 2 days in a tank, where the light condition was regulated to vary periodically over 24 h. The individuals were then released in Maizuru Bay and tracked using acoustic telemetry. Four wild individuals became most active at dawn during a day in the tank, and settled near the release area to stay for 28–104 days after release in Maizuru Bay. In contrast, one wild and four hatchery-reared individuals were not active at dawn, and then did not settle in Maizuru Bay after release. Among the four settled wild individuals, the more active a fish had been in the tank, the more distant the individual moved from the release point until its settlement. The diel activity pattern should be a factor deciding whether red tilefish would settle nearby after release, and the relative amount of activity during rearing is probably related to the degree of dispersion within the release area. |
| |
Keywords: | acoustic telemetry Branchiostegus japonicus diel activity digging behavior predictive index red tilefish settlement stock enhancement |
本文献已被 SpringerLink 等数据库收录! |
|