Age and growth during immature stages of the mangrove red snapper Lutjanus argentimaculatus in waters around Ishigaki Island, southern Japan

被引:0
|
作者
Hideaki Yamada
机构
[1] Fisheries Research Agency,Ishigaki Tropical Station, Seikai National Fisheries Research Institute
来源
Fisheries Science | 2010年 / 76卷
关键词
Age; Growth; Lutjanidae; Mangrove; Otolith;
D O I
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中图分类号
学科分类号
摘要
Age and growth during immature stages of the mangrove red snapper Lutjanus argentimaculatus were examined using 129 sectioned otoliths of fish collected in rivers and coastal areas around Ishigaki Island. Monthly changes in the marginal growth index indicated that ring marks (inner edge of opaque zone) are formed once a year around May. Estimated ages of the sampled fish ranged from 0.2 to 4.5 years. The proportion of mangrove red snappers collected in each sampling set in the rivers was associated with age, namely, the older the fish, the smaller the proportion. This result suggests that the mangrove red snapper gradually moves from the river habitat to coastal areas with increasing age between 1 and 3 years. The relationship between standard length (Y; cm) and age (X; year) was expressed by the linear regression Y = 6.30X + 5.41. Both the somatic and otolith growth of age-one and age-two fish collected in coastal areas were faster than those of fish collected in rivers, suggesting that individuals with fast growth leave the rivers earlier than those with slow growth. Whereas the basic growth pattern obtained in this study is similar to that of the mangrove red snapper in waters around Great Barrier Reef, Australia, there is a clear difference in length of time spent in rivers between the two populations, probably associated with the difference in the scale of the rivers used as nursery grounds.
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页码:445 / 450
页数:5
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