Abstract
The white-streaked grouper (Epinephelus ongus) is an important fisheries target in the region around Okinawa. This species forms spawning aggregations at specific spawning grounds in the last-quarter of the moon in April and/or May. Using a tag-and-release method, we estimated the migration distance and the degree of unified movement of groupers associated with the spawning migration. In total, 1157 E. ongus individuals were tagged and released at their home grounds in the non-spawning period and 350 were tagged at a known spawning ground (Yonara Channel) in the spawning period. For the fish that were released at the home grounds, 23 individuals were recaptured at the spawning ground during in the spawning periods. For the individuals that were released at the spawning ground, six individuals were recaptured outside of the spawning ground. The estimated migration distances from the home ground to the spawning ground ranged from 2.2 to 8.8 km. There was no significant relationship between the fish total length (TL) and migration distance for both males and females. Tagged individuals inhabiting the same home ground were recaptured at different points at the spawning ground separated by a distance of over several hundred meters. Furthermore, tagged individuals that were released at the same point at the spawning ground were recaptured at different home grounds separated by a distance up to several kilometers. These results suggest that unified movements associated with the spawning migration are not high for E. ongus, which is contradict with some previous studies suggesting the coordinated spawning migration of other Epinephelus spp.
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Acknowledgments
We express our grateful thanks to K. Kinjo for his assistance in field surveys and especially for his field guiding and piloting of the research boat, T. Yogi, A. Yano, S. Arakaki, Y. Fukuda, G. Suzuki, Y. Kawabata, H. Yamashita and Y. Akita for their assistance with tagging and/or capturing tagged fishes, S. Mamiya for laboratory work and the staff of Research Center of Sub-tropical Fisheries, Seikai National Fisheries Research Institute, for support during the present study. Constructive comments on the manuscript from C.P. Norman were much appreciated. We also thank the fishermen and staff of Yaeyama Fishermen’s Cooperative Association for their kind provision of the recaptured fishes. The present study complies with current laws in Japan.
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Nanami, A., Ohta, I. & Sato, T. Estimation of spawning migration distance of the white-streaked grouper (Epinephelus ongus) in an Okinawan coral reef system using conventional tag-and-release. Environ Biol Fish 98, 1387–1397 (2015). https://doi.org/10.1007/s10641-014-0366-0
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DOI: https://doi.org/10.1007/s10641-014-0366-0