| Studies on rickettsia-like organism (RLO) disease of tropical marine pearl oyster-Epidemiological investigation of RLO disease in juvenile populations of maricultured Pinctada maxima |
| |
| 作者姓名： | Xinzhong Wu Dengfeng Li Jinpei Pan Jingbo Jiang |
| |
| 作者单位： | Xinzhong Wu，Dengfeng Li，Jinpei Pan，Jingbo Jiang College of Animal Sciences，Zhejiang University，Hangzhou 310029，China. Email: wuxz@zju.edu.cn
South China Sea Institute of Oceanology，Chinese Academy of Sciences，Guangzhou 510301，China
School of Life Sciences，SUN YAT-SEN University，Guangzhou 510275，China |
| |
| 基金项目： | Major State Basic Research Development Program of China under contract No. G1999012001，Key Science Foundation of the Chinese Academy of Sciences contract KS85-121. |
| |
| 摘 要： | The death which occurred in juvenile population was a severe problem in the course ofPinctada maxima artificial culture. With the methods of field investigation, histological study and statistic analyses, the epidemiological study was carried out on the disease and death in juvenile populations of Pinctada maxima in the Xinying Pearl Oyster Mariculture Farm of Lingao County (for the A, B and C batches of cultured juveniles hanged in the sea) and the Xincun Pearl Oyster Mariculture Farm of Lingshui County (for the D batch of cultured juvenile hanged in the pond), Hainan Province from November 1993 to April 1995.The results show that the deaths which occurred in juvenile populations of Pinctada maxima presented an outbreak pattern. The peak of mortality rates, in general, occurred in 4-to 6-month old pearl oyster juveniles, and the mortality rates gradully declined with the extention of pearl oyster age after cul-turing 8 months. The correlation between the mortality rates of juvenile populations and mean
|
| 关 键 词： | Pinctada maxima rickettsia-like organism epidemiology juvenile population |
| 收稿时间： | 2002/12/18 0:00:00 |
| 修稿时间： | 2003/2/12 0:00:00 |
Studies on rickettsia-like organism (RLO) disease of tropical marine pearl oyster-Epidemiological investigation of RLO disease in juvenile populations of maricultured Pinctada maxima |
| |
| Xinzhong Wu,Dengfeng Li,Jinpei Pan,Jingbo Jiang.Studies on rickettsia-like organism (RLO) disease of tropical marine pearl oyster-Epidemiological investigation of RLO disease in juvenile populations of maricultured Pinctada maxima[J].Acta Oceanologica Sinica,2003,22(3):421-435. |
| |
| Authors: | Xinzhong Wu Dengfeng Li Jinpei Pan and Jingbo Jiang |
| |
| Institution: | 1.College of Animal Sciences, Zhejiang University, Hangzhou 310029, China;South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China2.South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China3.School of Life Sciences, SUN YAT-SEN University, Guangzhou 510275, China |
| |
| Abstract: | The death which occurred in juvenile population was a severe problem in the course of
Pinctada maxima artificial culture. With the methods of field investigation, histological study and statistic analyses, the epidemiological study was carried out on the disease and death in juvenile populations of Pinctada maxima in the Xinying Pearl Oyster Mariculture Farm of Lingao County (for the A, B and C batches of cultured juveniles hanged in the sea) and the Xincun Pearl Oyster Mariculture Farm of Lingshui County (for the D batch of cultured juvenile hanged in the pond), Hainan Province from November 1993 to April 1995.
The results show that the deaths which occurred in juvenile populations of Pinctada maxima presented an outbreak pattern. The peak of mortality rates, in general, occurred in 4-to 6-month old pearl oyster juveniles, and the mortality rates gradully declined with the extention of pearl oyster age after cul-turing 8 months. The correlation between the mortality rates of juvenile populations and mean body lengths of juvenile populations show that the mortality rate become higher under 4 cm of mean body lengths of juvenile population and become obvious declined over 5 cm of mean body lengths. The peak of mortality rate occurred in 1-3 cm of mean body lengths. The results of histological observation showed that rickettsia-like organism inclusions were common, histological widespread infective agent among every batches (A, B, C and D) of cultured juvenile populations. The mean severity indices (SI) of rickettsia-like organism (RLO) infection were positively correlated with mortality rates of juvenile populations. After or within every peaks of RLO infection were all accompanied with the peaks of mortality rates of host populations and the mortality rates declined with decreased RLO infection. So the evidences of histological observation and epidemiology in this study indicated that rickettsia-like organism (RLO) may be as an important pathogenic organism of disease and death of cultured Pinctada maxima. In addition, a few ciliates were discovered only in part of batch A of cultured juvenile population. The mortality rates in juvenile populations were not correlated with the weekly mean temperature and salinity of sea water. |
| |
| Keywords: | Pinctada maxima rickettsia-like organism epidemiology juvenile population |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |
