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題 名 | An Observation on the RNA/DNA Ratio of Individual Japanese Anchovy Larva from Four Hydrographic Regions in the Northeastern Waters of Taiwan=臺灣東北水域日本鯷仔魚個體RNA/DNA比值的考察 |
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作 者 | 丘臺生; 黃俊邠; | 書刊名 | Proceedings of the National Science Council : Part B, Life Science |
卷 期 | 23:2 1999.04[民88.04] |
頁 次 | 頁69-73 |
分類號 | 439.2 |
關鍵詞 | 臺灣東北水域; 日本鯷仔魚; 個體; Nutritional condition; Anchovy; East China sea; Kuroshio; |
語 文 | 英文(English) |
英文摘要 | The RNA/DNA ratios of Japanese anchovy (Engraulis japonica) larvae caught from the northeastern waters of Taiwan were examined and compared in this study. Four types of water masses can be distinguished in the area; thus, four hydrographic regions are defined as the southern East China Sea (SECS), Kuroshio (KUR), surface mixing water (MIX) of SECS and KUR, and upwelling water (UWW) from subsurface KUR. The nucleic acid contents of individual larva were measured, and the RNA/DNA ratio was used as an index to compare the nutritional condition of larvae from among the waters. In general, the RNA and DNA contents were related to body size, but the RNA content had higher variability in correspondence to hydrographic differences. Larvae from the KUR showed a significantly lower RNA/DNA ratio than did those from the SECS, MIX and UWW. Finally, a relatively poor nutritional condition of Japanese anchovy larvae in the KUR is inferred, and the distribution pattern of Japanese anchovy in the waters around Taiwan is explained. |
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