Infection Dynamics of the Monogenean Neoheterobothrium hirame Among Young Wild Japanese Flounder in the Western Sea of Japan
Infection Dynamics of the Monogenean Neoheterobothrium hirame Among Young Wild Japanese Flounder in the Western Sea of Japan
复制标题
日本西部海幼年野生日本牙鲆中单殖期新异博氏菌的感染动态
DOI：
10.3147/jsfp.37.131
复制
发表时间：
2002
期刊：
影响因子：
0.6
通讯作者：
K. Ogawa
中科院分区：
文献类型：
--
作者：
H. Anshary;E. Yamamoto;Takayuki Miyanaga;K. Ogawa
对1999年春至2000年春至秋在日本鸟取县西部海域捕获的野生0岁牙鲆新异博氏菌感染动态进行了调查。两年的感染呈现相同的趋势，6月感染比目鱼，8月初开始出现第二代寄生虫，此后感染率和平均寄生虫丰度都有所增加，10月份达到100%。1~2岁感染的比目鱼可能是0岁比目鱼的感染源。寄生虫的分布表明，从1999年7月到8月，寄生虫在0岁的鱼群中过度分散的情况越来越多，随后的几个月过度分散的情况持续减少。此外，在8月下旬至10月，只能捕到少数几条鱼。这些结果表明，在这一时期，0岁比目鱼体内发生了寄生虫引起的宿主死亡。2000年8月下旬，该寄生虫在0岁牙鲆种群中也表现出类似的过度分散分布，但此后过度分散的情况并未明显减少。这可能是因为非常小的寄生虫在10月中旬占主导地位。与1999年一样，10月至11月鱼类密度大幅下降。在2000年8月的一项调查中，有一种趋势是贫血的严重程度与感染的强度有关。总而言之，1999年和2000年秋季鸟取县0岁比目鱼数量的急剧下降，很可能是由N.hirame引起的。
Investigations were made on the infection dynamics of Neoheterobothrium hirame among wild 0-year-old Japanese flounder Paralichthys olivaceus caught in the western Sea of Japan off Tottori Prefecture from spring to autumn in 1999 and 2000. The infection shows the same tendency in both years; flounder became infected in June, a second parasite generation started to appear in early August, and both the prevalence of infection and mean parasite abundance increased thereafter, reaching 100% prevalence in October. One- to two-year-old infected flounder probably acted as the source of infection to the 0-year-old flounder. The parasite distribution showed an increasing overdispersion among 0-year-old fish population from July to August 1999, followed by a continuous decrease in overdispersion in the following months. Furthermore, only a few numbers of fish could be collected in late August to October. These suggest that parasite-induced host mortality occurred among the 0-year-old flounder in this period. In 2000, the parasite showed a similar overdispersed distribution among the 0-year-old flounder populations in late August, but the overdispersion was not clearly decreased afterwards. This is probably because very small-sized parasites were dominant in mid-October. The fish density was extremely reduced from October to November as in 1999. In a survey in August 2000, there was a tendency that severity of anemia was correlated with the intensity of infection. As a conclusion, it is highly probable that N. hirame contributed to the sharp decline in the 0-year-old flounder population in Tottori Prefecture in the autumn of 1999 and 2000.
DOI：
10.7939/r3j38kv04
发表时间：
1997-08
期刊：
The Journal of parasitology
影响因子：
--
作者：
A. O. Bush;K. Lafferty;J. Lotz;A. Shostak
通讯作者：
A. O. Bush;K. Lafferty;J. Lotz;A. Shostak