Zica E O P, Brandão H, Zawadzki C H, Nobile A B, Carvalho E D, da Silva R J
Zoology Postgraduate Course, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo State, Brazil.
J Helminthol. 2011 Mar;85(1):73-9. doi: 10.1017/S0022149X10000271. Epub 2010 May 12.
The aim of this study was to report the occurrence of Austrodiplostomum compactum metacercariae in the eyes of 98 specimens of loricariid fish (Hypostomus ancistroides, H. hermanni, H. iheringii, H. margaritifer, H. regani, H. strigaticeps, Hypostomus sp. and Megalancistrus parananus) from the Chavantes reservoir (23°07'36″S and 49°37'35″W) located in the rio Paranapanema, upper Paraná river basin, municipality of Ipaussu, São Paulo State, Brazil. Fish were collected from October 2007 to February 2009 using nylon monofilament gill nets and transported to the field laboratory where they were euthanized and the eyes were taken and examined under a stereomicroscope. Hypostomus ancistroides and M. parananus were not infected by this diplostomid. Hypostomus hermanni and H. margaritifer were represented by only one specimen but both had a high intensity of A. compactum metacercarie (27 and 35, respectively). Hypostomus strigaticeps (n = 45) and H. iheringii (n = 28) were the most representative specimens and the prevalence, mean intensity of infection and mean abundance were 24.4%, 10.3 and 2.7, and 64.2%, 13.1 and 8.4, respectively. No correlation was observed between the intensity of infection and the standard length (r = - 0.223; P = 0.827) and weight (r = 0.03; P = 0.779) of studied fish. Similarly, linear regression among these variables showed a poor correlation and indicated that the infection by A. compactum metacercariae occurs similarly in small and large fish specimens. A seasonal pattern of infection was not observed. Hypostomus hermanni, H. iheringii, H. margaritifer and H. strigaticeps were new hosts recorded for A. compactum metacercariae. A review of morphometric data of A. compactum metacercariae is presented.
本研究旨在报告在巴西圣保罗州伊保苏市巴拉那帕内马河上游巴拉那河流域的查万特斯水库（南纬23°07'36″，西经49°37'35″）采集的98份甲鲶科鱼类标本（Hypostomus ancistroides、H. hermanni、H. iheringii、H. margaritifer、H. regani、H. strigaticeps、Hypostomus sp.和Megalancistrus parananus）眼中紧凑澳双穴吸虫后尾蚴的出现情况。2007年10月至2009年2月期间，使用尼龙单丝刺网采集鱼类，并将其运至野外实验室，在那里对鱼实施安乐死，取出眼睛并在体视显微镜下检查。Hypostomus ancistroides和M. parananus未被这种双穴吸虫感染。H. hermanni和H. margaritifer仅各有一个标本，但二者的紧凑澳双穴吸虫后尾蚴感染强度都很高（分别为27和35）。H. strigaticeps（n = 45）和H. iheringii（n = 28）是最具代表性的标本，其感染率、平均感染强度和平均丰度分别为24.4%、10.3和2.7，以及64.2%、13.1和8.4。在所研究鱼类的感染强度与标准体长（r = -0.223；P = 0.827）和体重（r = 0.03；P = 0.779）之间未观察到相关性。同样，这些变量之间的线性回归显示相关性较差，表明紧凑澳双穴吸虫后尾蚴在大小不同的鱼类标本中感染情况相似。未观察到感染的季节性模式。H. hermanni、H. iheringii、H. margaritifer和H. strigaticeps是紧凑澳双穴吸虫后尾蚴新记录的宿主。本文还对紧凑澳双穴吸虫后尾蚴的形态测量数据进行了综述。
