Age determination of chum salmon using scales and otoliths

作者：Kaneto Yuriko^*; Katayama Satoshi; Iida Masaya

来源：Nippon Suisan Gakkaishi, 2017, 83(5): 758-763.

DOI：10.2331/suisan.16-00071

Age determination of chum salmon using scales becomes diffcult as sexual maturation progresses. We examined and compared the working effciency and accuracy of aging methods using scales, otolith surface, and otolith section with chum salmon. The percentage of age estimated correctly, cross-checked with known age by the otolith thermal mark and release protocol, was under 80% for the otolith surface and the common otolith sectioning methods in which otoliths are sliced to around 150 mu m thickness. The accuracies were 100% using scales and thinner otolith sections of around 80 mu m thickness. We therefore recommend employing the more accurate aging methods using scales and thinner otolith sections in line with the working effciency and maturational conditions.

• 出版日期2017-9