中国南部池养幼鲩寄生鱊头槽绦虫的种群动态(英文)  

POPULATION DYNAMICS OF BOTHRIOCEPHALUS ACHEILOGNATHI (EUCESTODA:BOTHRIOCEPHALIDAE) IN JUVENILE GRASS CARP CTENOPHARYNGODON IDELLUS IN POND CULTURE IN SOUTH CHINA

作　　者：廖翔华[1] 

机构地区：[1]中山大学生命科学学院鱼类学实验室,广州510275

出　　处：《动物学报》2002年第2期154-166,共13页ACTA ZOOLOGICA SINICA

基　　金：国家自然科学基金资助项目 (No .38970 14 6 )~~

摘　　要：本项目研究池塘养殖的鲩 (草 )鱼体内寄生的头槽绦虫 (B .acheilognathi)的种群动态。于 1 986、1 9 87和 1 998三年内分别观察 0、Ⅰ龄幼鲩及Ⅱ龄商品鲩感染的情况。 0龄及Ⅰ龄越冬鲩的绦虫种群由初染至收敛周期为 1年 ,Ⅱ龄鲩不感染 ,冬季高感染率导致早春水温在 2 0 4℃的感染高峰 ,感染强度持续数月 ,6月达到 2 4 3虫 /鱼。未感染的 0及Ⅰ龄幼鲩在 2、 3月分别引进放养感染了的越冬Ⅰ龄鲩的池塘。1个月后 ,感染率达到 93 1 %～ 96 9% ,8至 9月感染率迅速下降 ,1 0月又稍升高。 1 986和 1 987年的 4～8月 ,绦虫的分布 (S2 / X) >1 ,为聚集分布 ,体长 <1cm的幼虫在种群结构中占优势 ,为 97 2 %～98 2 % ,1 1月幼虫数目下降 ,大孕节绦虫随之出现 ,1 2月大孕节绦虫仅少数存留或全部消失。试验结果为消灭鲩鱼绦虫病提供了可靠依据。The population dynamics of Bothriocephalus acheilognathi , a parasite in juvenile grass carp Ctenopharyngodon idellus (C. et V.) raised in a fish pond in South China, was studied in 1986, l987 and 1998 The tapeworm population in age 0 and over wintering age Ⅰ grass carp followed an annual cycle from its establishment to its decline, whereas age Ⅱ commercial sized fish was not affected. A high level of prevalence in winter led to a peak in early spring at 20 4 ℃ and a high level of mean intensity in the following months. When uninfected 0 group (1986) and age Ⅰ juvenile (1987) grass carp were introduced into the pond which kept the infected over wintering grass carp, their prevalence reached 93 1% and 96 9% respectively one month after infection. The prevalence of the tapeworm in over wintering and newly infected juvenile grass carp declined sharply in August and September at 28～33℃ and rose again to a minor peak in October. The mean intensity of 243 9 worms was observed in July. Cestode dispersion (S 2/ ) for 1986 and 1987 was > 1 from April to October. In the population structure from April to August, young worms < 1 cm dominated, maintaining 97 2%～98 2%. In November, the number of young worms decreased with the appearance of large sized gravid worms, which either vanished or remained in small numbers in December. The above findings provide a feasible basis for the control of bothriocephaliasis epizootics.

关 键 词：中国南部 池养幼鲩 寄生Yu头槽绦虫 种群动态 感染率 感染强度 种群结构 草鱼 寄生虫 

分 类 号：S941.523[农业科学—水产养殖]