大亚湾养殖鱼类寄生车轮虫的种类组成与季节动态

2017年8月至2018年7月对大亚湾8种养殖鱼类的车轮虫感染情况进行了调查,采用Lom倡导的"统一特定方法"及Van As&Basson提出的"齿体定位描述法"对采获的车轮虫标本进行了形态鉴定与描述。结果在卵形鲳鲹(Trachinotus ovatus)、星点笛鲷(Lutjanus stellatus)、鞍带石斑鱼(Epinephelus lanceolatus)、眼斑拟石首鱼(Sciaenops ocellatus)和虎龙杂交斑[E. fuscoguttatus (♀)×E. lanceolatus (♂)]等5种鱼上共检获5种车轮虫:亚卓车轮虫(Trichodina jadranica)、莱普斯车轮虫(T. lepsii)、长须鳠车轮虫(T. guliae)、劳牧小车轮虫(Trichodinella lomi)和斜拟车轮虫(Paratrichodina oblique);其中卵形鲳鲹5种虫均有寄生,虎龙杂交斑感染了4种虫,星点笛鲷、眼斑拟石首鱼和鞍带石斑鱼分别感染了3种、2种和1种虫。周年感染数据表明:5种虫的感染率均以卵形鲳鲹最高,眼斑拟石首鱼上2种虫的感染率最低;莱普...

SPECIES COMPOSITION AND SEASONAL DYNAMICS OF PARASITIC TRICHODINIDS OF CULTURED FISHES IN DAYA BAY

Trichodinids are a group of parasitic ciliates that are common and harmful in aquaculture. From August 2017 to July 2018, trichodinid infections in 8 species of farmed fish in Daya Bay were investigated. All measurements are presented in μm and follow the uniform specific characteristic system proposed by Lom (1958). The denticles were described in detail in accordance with the method proposed by Van AS and Basson (1989). A total of five species of trichodinids (Trichodina jadranica Raabe, 1958; T. lepsii Lom, 1962; T. guliae Asmat, 2006; Trichodinella lomi Xu, Song & Warren, 1999; Paratrichodina oblique Lom, 1963) were detected from five species of fish (Trachinotus ovatus, Lutjanus stellatus, Epinephelus lanceolatus, Sciaenops ocellatus and Hulong grouper); of which, Trachinotus ovatus was infected with five species of trichodinids, and Hulong grouper, Lutjanus stellatus, Sciaenops ocellatus and Epinephelus lanceolatus were infected with four, three, two and one species of trichodinids respectively. The annual infection data showed that the highest prevalence of these five species was Trachinotus ovatus, and the lowest prevalence was the two trichodinid species on Sciaenops ocellatu. Trichodina jadranica, T. guliae and Paratrichodina oblique have the highest mean intensity of infection in Trachinotus ovatus, Trichodina lepsii and Trichodinella lomi in Hulong grouper. The seasonal dynamics of the total population of parasitic trichodinids showed that the prevalence and the mean intensity in winter were generally low, but the peak season of infection varies with the species; among them, the mean intensity of Paratrichodina oblique was higher than the other four species except winter, and the peak of infection appears in autumn. The seasonal dynamics of the five trichodinid species of Trachinotus ovatus are similar to that of the total population.