Growth of wild pearl oysters <Emphasis Type="Italic">Pinctada fucata,Pinctada margaritifera</Emphasis> and <Emphasis Type="Italic">Pinctada sugillata</Emphasis> (Bivalvia: Pteriidae) in Taiwan |
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| Authors: | Jiuan Jiuan Hwang Takashi Yamakawa Ichiro Aoki |
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| Institution: | (1) National Kaohsiung Marine University, 142 Hai-Chuan Road, Nan-tzu, Kaohsiung, Taiwan;(2) Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, 113-8657 Bunkyo, Tokyo, Japan |
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| Abstract: | In order to understand growth features of pearl oysters in the genus Pinctada, i.e. Pinctada fucata, Pinctada margaritifera, and Pinctada sugillata in Taiwan, a total of 3062 wild individuals of these species from juvenile to adult were collected monthyly from March 2001
to April 2002 in Jukeng, Pingtung County, south-west Taiwan. Quantitative measurements of live oysters were conducted for
shell height (SH), shell length (SL), shell width (SW), hinge length (HL), and wet weight (WW). Different cohorts were identified
through multiple length frequency analysis on SH of P. fucata and P. margaritifera, and growth curves with seasonal variation were estimated for these species. Pinctada fucata in Taiwan had a different seasonal growth pattern from the Japanese population, but had similar growth rates during the high
growth period. The growth rate of P. margaritifera in Taiwan was slower than in French Polynesia, the Solomon Islands, and the Red Sea. Comparisons of morphological growth
features among the three species show large differences in the SW-related features. Pinctada fucata in Taiwan had larger SW than in Japan and Korea. The differences in growth rates and morphological features suggested that
the wild Taiwanese oysters may retain genetically pristine characteristics, thus genetic conservation might be urgently needed. |
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| Keywords: | growth morphology pearl oyster Pinctada fucata Pinctada margaritifera Pinctada sugillata Taiwan |
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