Abstract
This study examined the ontogenetic change in vertical distribution associated with algae and the thyroid hormone profiles of black rockfish (Sebastes schlegelii) under rearing conditions. Experimental observations on distribution were carried on black rockfish from the newly born larval stage to juveniles 75 days after birth (DAB). Position was categorized by vertical location [upper layer, mid layer and lower layer (LL)] and by association with artificial algae (floating algae, bottom algae and no association). Position of fish was observed four times a day, at 0400 (dawn), 1200 (noon), 1800 (dusk) and 2400 (midnight) hours. The majority of fish (>80%) reached transforming larval stage [17.8 ± 0.7 mm total length (TL)] at 25 DAB and juvenile stage (24.3 ± 0.6 mm TL) at 35 DAB. Newly born larvae were mainly distributed at surface and middle layers, the shift of vertical distribution to the LL occurred between 10 and 25 DAB, and over 98% of the individuals were distributed near the bottom after 35 DAB. Association behavior with algae was first observed from 20 to 30 DAB depending on the time of day. Percentage of fish associated with bottom algae increased from 25 to 40 DAB and reached 50–70% thereafter. Thyroid hormone (T4) showed two surges at 30 and 50 DAB. The first surge corresponded to the transforming larval stage and the occurrence of association behavior with algae. The results indicate that pelagic larvae settle to the bottom layer before metamorphosis, and association behavior with algae appears at the transforming larval stage. A high T4 concentration at 30 DAB indicates a close relationship with these morphological and behavioral developments.
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Acknowledgments
We would like to thank Dr. M. Aritaki (Research Center for Fisheries and Environment in the Ariake and Yatsushiro Bays, Seikai National Fisheries Research Institute, FRA), and all the other staff in FRA Miyako Station for their valuable advice and support of this study. Any experimental work in this study complied with the current laws of Japan. This research was partly supported by a grant (ID number: 19208018) provided by the Japanese Society for the Promotion of Science (JSPS).
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Chin, BS., Nakagawa, M., Tagawa, M. et al. Ontogenetic changes of habitat selection and thyroid hormone levels in black rockfish (Sebastes schlegelii) reared in captivity. Ichthyol Res 57, 278–285 (2010). https://doi.org/10.1007/s10228-010-0165-3
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DOI: https://doi.org/10.1007/s10228-010-0165-3