Diversidade dos metazoários parasitos de Pellona flavipinnis (Valenciennes, 1836) (Clupeiformes: Pristigasteridae) de um lago de várzea da Amazônia brasileira

Abstract

Fifty-five specimens of Pellona flavipinnis (mean length 17.3cm ± 2.9 and mean weight 94g ± 77.5) were captured in the Catalão lake complex. Of these, 41 were parasitized by at least one species of metazoan. The fish were necropsied according to the rules of the Fish Parasitology Laboratory of the National Institute for Research in the Amazon. Two hundred and forty nine parasites were identified. Pellona flavipinnis is a new host for 5 species: 57 Myxozoa cysts; 3 individuals from Digenea; 29 from Acanthocephala; 158 of Nematoda and 2 of Branchiura. Myxozoa cysts, Myxobolus sp. they parasitized the gills and the operculum; the Digenea Austrodiplostomum compactum the eye; the Acanthocephala Neoechinorhynchus (Neoechinorhynchus) pellonis the intestine, the Nematoda Anisakis sp. the liver, stomach and intestine and Branchiura Argulus angelae the integument. The highest prevalence was of Anisakis sp. with 58.1%, followed by N. (N.) pellonis with 23.6%. The other species occurred with low prevalence. Sixty-three-point four percent of the parasitic community of P. flavipinnis was dominated by Anisakis sp., presenting the highest degree of importance in the community. The parasitic fauna of P. flavipinnis consisted of one secondary species and four satellite species. Only Anisakis sp. showed secondary distribution, with a prevalence of 58.1%. There was no relationship between abundance and richness of parasites and fish size.