A new aging technique by UV light observation of burnt otoliths for the conger eel Conger myriaster (Brevoort) |
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| Authors: | Satoshi Katayama Toshinori Ishida Katsuya Goto Keiki Iizuka Keishiro Karita |
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| Affiliation: | (1) Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori Amamiyamachi, Aoba, Sendai 981-8555, Japan (e-mail: katayama@bios.tohoku.ac.jp), JP;(2) Fukushima Prefecture Fisheries Experiment Station, Soma Branch, 18-2 Oikawa, Obama, Soma 976-0022, Japan (e-mail: fs-shijo@mue.biglobe.ne.jp), JP;(3) Fukushima Prefecture Office, 2-16 Sugitsumacho, Fukushima 960-8670, Japan, JP;(4) Department of Biotechnology, Sensyu University of Ishinomaki, 1 Shinmito Minamisakai, Ishinomaki 986-0031, Japan, JP;(5) Graduate School of Dental Science, Tohoku University, 4-1 Seiryoumachi, Aoba, Sendai 980-8575, Japan (e-mail: karita@physiol.dent.tohoku.ac.jp), JP |
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| Abstract: | A new aging method, fluorescent observation of burnt otoliths, was discovered to disclose the age and growth of the conger eel. Under UV light, bright fluorescent zones were visible in the burnt otolith but not in the unburnt otolith. An illumination wavelength around 380 nm was found to be suitable for fluorescence observation of burnt otoliths. Bright zones of the conger eel otolith formed around June–August in Sendai Bay and were validated as annuli. The conger eels caught by net pot fishery were found to be mainly aged from 1+ to 4+ years. Received: March 7, 2001 / Revised: September 12, 2001 / Accepted: October 10, 2001 |
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| Keywords: | Conger myriaster Age determination Otolith Burning method UV observation |
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