大亚湾海域石斑鱼(Epinephelus spp.)寄生单殖吸虫群落结构研究

调查了大亚湾海域13种石斑鱼(Epinephelus spp.)寄生单殖吸虫群落,结果发现有10种鱼感染单殖吸虫,占调查鱼种类的四分之三,检获单殖吸虫16种,隶属于3科5属,其中拟合片虫属(Pseudorhabdosynochus spp.)10种;除鞍带石斑(E.lanceolatus)和拟青石斑(E.fasciatomaculosus)外,8种鱼可分别感染3—7种单殖吸虫;感染单殖吸虫种类最多的是玳瑁石斑(E.quoyanus)达7种,次之是青石斑(E.awoara)和养殖的橙点石斑(E.bleekeri)均感染6种;各单殖吸虫种类中,感染强度最大的是拟合片虫(P.serrani))(棕点石斑,E.fuscoguttatus)128只/尾,次之是石斑拟合片虫(P.grouperi)(青石斑)62只/尾,接下来是斜带拟合片虫(P.coioidesis)(大斑石斑,E.macrospilos)59只/尾和杯阴拟合片虫(P.cupatus)(玳瑁石斑)49只/尾;平均密度最高的是棕点石斑上检获的拟合片虫128只/尾;在检获的16种单殖吸虫中,8种可分别寄生于2种或2种以上石斑鱼,石斑鳞盘虫(Diplectanum grouperi)和拟合片虫在6种石斑鱼上都能检获,符合广寄生单殖吸虫种特征。有5种鱼检查尾数5尾以上的,其中玳瑁石斑单殖吸虫感染率最高62.07%,其内群落的物种丰富度与宿主体长呈显著正相关。

THE COMMUNITY STRUCTURE OF MONOGENEANS FROM EPINEPHELUS spp. IN DAYA BAY, SOUTH CHINA SEA

The community structure of monogeneans in Epinephelus spp. from Daya Bay, South China Sea was studied. Thirteen species of Epinephelus spp. (12 wild species and 2 species cultured-cage) were studied, from which 16 mongenean species, belonging to 5 genera of 3 families were found in 10 species of Epinephelus spp., more than three fourth. Except for E. lanceolatus and E. fasciatomaculosus, every of 8 species of fish severally harboured 3 to 7 species of monogeneans. In the species richness:7 in E. quoyanus and 6 in E. awoara and E. Bleekeri; in intensity:128 parasites/fish for P. serrani (E. fuscoguttatus), 62 for P. grouperi (E. awoara), 59 for P. coioidesis (E. macrospilos), and 49 for P. cupatus (E. quoyanus); the most abundance is P. serrani (E. fuscoguttatus) reached at 128 parasites per fish. Among the 16 species of monogeneans, 8 could parasitize more than 2 fish species. Diplectanum grouperi and Pseudorhabdosynochus serrani were detected from 6 fish species in the study. Among 5 fish species screened for over 5 individuals, E. quoyanus was the most prevalence of 62.07%, in which the species richness of ectoparasites in E. quoyanus at infracommunity level was significantly correlated positively with the size of host.