Ribeiro Juliana Souza, de Oliveira Francisco Carlos Rodrigues, Ederli Nicole Brand
Laboratório de Sanidade Animal, Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), Av. Alberto Lamego, 2000, Parque Califórnia, Campos dos Goytacazes, RJ, 28013-602, Brazil.
Instituto do Noroeste Fluminense de Educação Superior (INFES), Universidade Federal Fluminense (UFF), Av. João Jasbick, s/n, Aeroporto, Santo Antônio de Pádua, RJ, 28470-000, Brazil.
Parasitol Res. 2017 Aug;116(8):2249-2254. doi: 10.1007/s00436-017-5528-5. Epub 2017 Jun 17.
The genus Anableps is composed of species Anableps anableps, Anableps dowi, and Anableps microlepis. These fishes are tropical and usually live on the surface of brackish water, being popularly known as four-eyed-fishes due to the presence of prominent eyes and a pupil split horizontally. A. anableps and A. microlepis are considered as sister species that live in sympatry in South America. A. dowi, however, is restricted to the Pacific Ocean (Central America) and is considered the most primitive species of this genus. The aims of this study were to investigate the presence of endoparasites in A. anableps from the Parnaíba's Delta and characterize them morphologically. During the necropsy, larvae of Contracaecum sp. in the third larval stage (L3) were collected from the pancreas of A. anableps, but no endoparasites were observed in other organs. The worms had a cuticular tooth and excretory pore located at the anterior end, a thread like body, whitish color, and without distinction of sex. The length of the ventricular appendix of the larvae was much greater than in other studies. This is the first report of endoparasitism in A. anableps and the first report of nematodes in four-eyed-fishes.
四眼鱼属由四眼鱼、多氏四眼鱼和小眼四眼鱼组成。这些鱼类生活在热带地区，通常栖息在咸淡水表面，因其突出的眼睛和水平分裂的瞳孔而被普遍称为四眼鱼。四眼鱼和小眼四眼鱼被认为是生活在南美洲同域分布的姐妹物种。然而，多氏四眼鱼仅限于太平洋（中美洲），被认为是该属最原始的物种。本研究的目的是调查来自帕纳伊巴三角洲的四眼鱼体内寄生虫的存在情况，并对其进行形态学特征描述。在尸检过程中，从四眼鱼的胰腺中采集到了第三期幼虫阶段（L3）的对盲囊线虫幼虫，但在其他器官中未观察到内寄生虫。这些蠕虫前端有一个角质齿和排泄孔，身体呈线状，颜色为白色，且无性别差异。幼虫心室附属物的长度比其他研究中的要长得多。这是四眼鱼体内寄生虫感染的首次报告，也是四眼鱼中线虫的首次报告。
