Costa Graça, Santos Maria J, Costa Luísa, Biscoito Manuel, de Carvalho Miguel A A Pinheiro, Melo-Moreira Egberto
Universidade da Madeira, Campus da Penteada 9000-390 Funchal, Portugal.
J Parasitol. 2009 Aug;95(4):1013-5. doi: 10.1645/GE-1760.1.
Geographic variations in the diversity and prevalence of helminth parasites of fish can provide important clues as to the relatedness of fish populations. In the present work, the stomachs of 64 conger eels, Conger conger, collected during 1999 and 2000, were examined for the presence of parasites. Four fish were infected with L3 stages of the nematode Anisakis simplex s.l. (Anisakidae), 1 with the nematode Cristitectus congeri (Cystidicolidae), 1 with the acanthocephalan Rhadinorhynchus pristis, 17 with postlarvae of Sphyriocephalus tergestinus (Eucestoda: Trypanorhyncha), and 55 with Lecithochirium spp. (Digenea: Hemiuridae). The hemiurids were the most abundant parasites, with a total of 385 individuals recovered. Strong aggregated distributions were found for both the digeneans, Lecithochirium musculus and Lecithochirium fusiforme, with variance-to-mean ratios (s2/x) and index of discrepancy (D) 13.98 and 0.672 (for L. musculus) and 8.08 and 0.90 for L. fusiforme, respectively. Intensity of L. musculus, L. fusiforme, and S. tergestinus showed significant relationships with depth of capture. Differences in number of species and prevalence were found between Madeira and the Atlantic coasts of the Iberian Peninsula.
鱼类蠕虫寄生虫的多样性和流行情况的地理差异可为鱼类种群的亲缘关系提供重要线索。在本研究中，对1999年至2000年期间采集的64条康吉鳗（Conger conger）的胃部进行了寄生虫检查。4条鱼感染了简单异尖线虫（Anisakis simplex s.l.，异尖科）的L3期幼虫，1条感染了康吉隐尾线虫（Cristitectus congeri，囊尾科），1条感染了长吻棘头虫（Rhadinorhynchus pristis），17条感染了地中海头槽绦虫（Sphyriocephalus tergestinus，真绦虫纲：三吻绦虫目）的后期幼虫，55条感染了枝睾属（Lecithochirium spp.，复殖目：半尾科）。半尾科寄生虫是最丰富的寄生虫，共检出385个个体。复殖吸虫中的鼠形枝睾吸虫（Lecithochirium musculus）和梭形枝睾吸虫（Lecithochirium fusiforme）均呈现出强烈的聚集分布，其方差均值比（s2/x）和离散指数（D）分别为13.98和0.672（鼠形枝睾吸虫）以及8.08和0.90（梭形枝睾吸虫）。鼠形枝睾吸虫、梭形枝睾吸虫和地中海头槽绦虫的感染强度与捕捞深度呈显著相关。在马德拉群岛和伊比利亚半岛的大西洋海岸之间，发现了物种数量和流行率的差异。
