Variation in otolith macrostructure of Japanese flounder (Paralichthys olivaceus): a method to discriminate between wild and released fish
Katayama, S.; Isshiki, T. (2007). Variation in otolith macrostructure of Japanese flounder (Paralichthys olivaceus): a method to discriminate between wild and released fish. J. Sea Res. 57(2-3): 180-186. https://dx.doi.org/10.1016/j.seares.2006.09.006
In: Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg. ISSN 1385-1101; e-ISSN 1873-1414, more
Also appears in:Yamashita, Y.; Nash, R.D.M.; van der Veer, H.W. (Ed.) (2007). Proceedings of the Sixth International Symposium on Flatfish Ecology, Part 1, held at Maizuru, Kyoto, Japan from 20-25 October 2005. Journal of Sea Research, 57(Spec. Issue 2-3). Elsevier: Amsterdam. IV, 89-235 pp., more
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| Keywords |
Cultured species
Ellipticity
Otoliths
Rearing
Stock identification
Stocks
Paralichthys olivaceus (Temminck & Schlegel, 1846) [WoRMS]
Marine/Coastal |
| Author keywords |
Japanese flounder; otolith shape; ellipticity; rearing experiment;thermal mark; secondary zone |
| Abstract |
The main objective of this study was to develop a method to discriminate between wild and hatchery-produced Japanese flounder, Paralichthys olivaceus, based on variations in otolith macrostructure. Otoliths of wild flounder were more elliptical than those of hatchery-produced fish, whereas otolith area and marginal coarseness showed no clear differences. Otolith morphometry did not vary significantly with water temperature or feeding conditions in rearing experiments. Reduced ellipticity in the otoliths of hatchery-produced fish could be caused by biotic and abiotic conditions after release. Throughout the study, it was found that otoliths of Japanese flounder reared at 15 and 20 °C regimes showed opaque zones regardless of feeding condition, while otolith of fish reared at 25 °C had translucent zones. The potential of thermal marks and secondary zones as a new mass-marking system is presented. |
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