Comparison of the growth of age-1 Pacific saury <Emphasis Type="Italic">Cololabis saira</Emphasis> in the Western and the Central North Pacific |
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Authors: | Satoshi Suyama Masayasu Nakagami Miyako Naya Yasuhiro Ueno |
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Institution: | (1) Hachinohe Station, Tohoku National Fisheries Research Institute, Fisheries Research Agency Japan, 25-259 Shimomekurakubo, Same, Hachinohe Aomori, 031-0841, Japan;(2) Present address: National Research Institute of Fisheries Science, Fisheries Research Agency Japan, 2-12-4 Fuku-ura, Kanazawa, Yokohama Kanagawa, 236-8648, Japan |
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Abstract: | The growth of age-1 Pacific saury Cololabis saira was compared based on an analysis of the body-length frequency distributions, radius of the annual ring (otolith hyaline
zones; ROH), and growth patterns in otolith increments. Fish were sampled at various locations between off the Japanese coast
(144°E) and in the Central Pacific (160°W) in June and July 2006, and the measurements were compared among the stations ranging
over six longitudinal areas, each with a longitudinal area of 10°. The mode of body-length frequency distributions of age-1
fish was larger in fish sampled west of 160°E (size class modes of 32.0–32.5 and 31.5–32.0 cm, respectively, in each 10° longitude
area) than in those sampled east of 170°E (28.5–29.0 or 29.0–29.5 cm in 3 areas). The ROH was also larger in the former group
(west of 160°E) than in the latter group (east of 170°E), but hatch periods of these two groups and age in days when the hyaline
zones form in August or September did not differ based on the analysis of otolith growth increments. The growth difference
occurred in the period between when the fish started their northward migration and when the hyaline zone was formed. These
results indicate that the habitats of the two groups were separate until at least June or July of their second year of life. |
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