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Change in Morphological and Biological Characteristics by Maturation of Japanese Eel, Anguilla japonica, Collected in Korea Waters  

Hong, Yang-Ki (Inland Fisheries Research Institute, National Institute of Fisheries Science)
Song, Mi-Young (Inland Fisheries Research Institute, National Institute of Fisheries Science)
Yi, Seok-Eun (CheongShim International Academy)
Lee, Wan-Ok (Inland Fisheries Research Institute, National Institute of Fisheries Science)
Publication Information
Korean Journal of Ichthyology / v.27, no.4, 2015 , pp. 263-274 More about this Journal
Abstract
Change in morphological and biological characteristics of Japanese eel, Anguilla japonica, by maturation were determined by examination of 182 individuals collected in Korea waters from September to December 2014. Eels were classified into four stages based on the silvering index. The proportion of silver eels collected from streams and estuaries (34.6%) was higher than that from the freshwater reservoirs (3.8%). The sex ratio between female and male was 1:0.11 (n=182). Mean total length and weight were positively related to the silvering process. The ratios of head and pectoral lengths to total length and the ratio of horizontal and vertical orbital diameters to head length were significantly different between the maturation stages. However the ratio of pre-dorsal and pre-anal lengths to total length were not significantly different between the maturation stages. The gonado-somatic index was the single character that could identify the whole four stages among the indices examined: gonado-somatic index (GSI), condition factor (K), gut index (GI) and eye index (EI) but hepato-somatic index (HSI). One pseudo-silver eel collected. looked like a late silver eel in the S2 stage according to its external body color and morphology, but most of other characteristics suggested that it might be in Y1 (yellow eel) or Y2 stage (late yellow eel).
Keywords
Anguilla japonica; silvering index; pseudo-silver eel;
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