Studies on rickettsia like organism (RLO) disease of the tropical marine pearl oyster Ⅶ Epidemiological investigation of RLO disease in larvae populations of maricultured <i>Pinctada maxima</i>

WU Xin-zhong; PAN Jin-pei; JIANG Jing-bo

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WU Xin-zhong, PAN Jin-pei, JIANG Jing-bo. Studies on rickettsia like organism (RLO) disease of the tropical marine pearl oyster Ⅶ Epidemiological investigation of RLO disease in larvae populations of maricultured Pinctada maxima[J]. Haiyang Xuebao, 2002, 24(6): 67-75.

Citation:

WU Xin-zhong, PAN Jin-pei, JIANG Jing-bo. Studies on rickettsia like organism (RLO) disease of the tropical marine pearl oyster Ⅶ Epidemiological investigation of RLO disease in larvae populations of maricultured Pinctada maxima[J]. Haiyang Xuebao, 2002, 24(6): 67-75.

Citation:

WU Xin-zhong, PAN Jin-pei, JIANG Jing-bo. Studies on rickettsia like organism (RLO) disease of the tropical marine pearl oyster Ⅶ Epidemiological investigation of RLO disease in larvae populations of maricultured Pinctada maxima[J]. Haiyang Xuebao, 2002, 24(6): 67-75.

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Studies on rickettsia like organism (RLO) disease of the tropical marine pearl oyster Ⅶ Epidemiological investigation of RLO disease in larvae populations of maricultured Pinctada maxima

Received Date: 1998-02-20
Rev Recd Date: 2001-06-06

Abstract

Abstract

The epidemiological investigations on the disease and death in mature eggs,embryonic developmental periods and larvae populations[including oocytes,fertilized ovum,early embry onic phase larvae(6h),D-shaped phase larvae(24h),early umbophase larvae,umbophase larvae,post umbophase larvae and eyespot phase larvae] in Luhuitou pearloyster of Mariculture Farm of Sany a City,Hainan Province in April 1995 show that there are two peaks of mortality rates which occurred in early umbo phase or umbophase and post umbophase(Figs 1~3 and Table 1)respectively from preembryonic developmental periods to larvae phases.It indicates that the onset and death of Pinctada maxima larvae populations followed a pattern of outbreak.Between the prevalence,intensity of RLO infection and the mortality rates of larvae populations have obviously positive corr elatio ns.Generally,every peak of RLO infection is always followed by a peak of mortality rate of larvae hosts,and the mortality rates of larvae hosts declined with decrease of RLO infection(Figs 1~3).Under the transmission electron microscopy(TEM)no rickettsia-like organisms were disco vered in oocytes,fertilized ovum and early embryonic phase larvae(6h).The RLO inclusions occurred first in the D-shaped phase larvae(24h)under histological examination.Absences of RLO in transmission electron examination of oocytes of RLO-infected adult females,fertilized ovum and early embryonic phase larvae(6h)indicate that RLO may not be transmitted transovarially.But RLO for hostinfection may be transmitted by contact transmission since RLO inclusions were firstidentified regularly in the D-shaped phase larvae (24h),while these D-shaped phase larvae were still unable to take food furing hatching 24.In addition,the result of epidemiolo gical investigation shows that no observable death occurred in the D-shaped larvae populations,but early obvious death occurred in larvae populations in the seventh day after fertilization,and the mortality rate is about 21.80%.It indicates that there was a incubation period from RLO infection for host(D-shaped phase larvae) to host onset and death occurred clinically.
- Pinctada maxima,
- rickettsia-like organism,
- epidemiology,
- larvae population

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References(29)

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