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 380nm 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.
|出版ステータス||Published - 2002 2 1|
ASJC Scopus subject areas