Seasonal change in the relationship between otolith radius and body length in age-zero Pacific saury <Emphasis Type="Italic">Cololabis saira</Emphasis> |
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| Authors: | Satoshi Suyama Kazuhiro Oshima Masayasu Nakagami Yasuhiro Ueno |
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| Institution: | (1) Hachinohe Branch, Tohoku National Fisheries Research Institute, 25-259 Shimomekurakubo, Same, Hachinohe Aomori, 031-0841, Japan;(2) Present address: National Research Institute of Far Seas Fisheries, 5-7-1, Orido, Shimizu Shizuoka, 424-8633, Japan |
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| Abstract: | We examined seasonal changes in the relationship between otolith radius and body length in age-zero Pacific saury Cololabis saira collected from June to December 2002–2004, based on 12,164 specimens. Results of the analysis using a generalized linear
model indicated that there were differences in the intercepts among months, but no difference was seen in the slopes. In addition,
post hoc analysis showed that the intercepts got larger as the month progressed from June to December. These results suggested
that although the body length growth rate decreased, the growth of the otolith does not decrease to the same degree as the
body after September, so the ratio of otolith radius to body length becomes larger as the months pass. Consequently, we consider
that the seasonal change in relation between otolith radius and body length affects the back-calculation of body length based
on otolith radius. |
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| Keywords: | Body length Growth Otolith radius Pacific saury Seasonal change |
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