Diversidade da fauna de metazoários parasitos de Pimelodus blochii Valenciennes, 1840 (Siluriformes: Pimelodidae) de lagos de várzea da Amazônia brasileira

Abstract

Were analyzed 45 specimens of Pimelodus blochii captured during four expeditions, in July of 2015, November and December of 2016, in the complex of lakes from Catalão, Iranduba, Amazonas. The mean measure of the fishes was 23.9 - 8.5 (13.9) cm of standard length and weighted a mean 113.78 - 11.8 (51.9) g. A total of 1.726 indivuals included in three phyla and four groups were found. Twelve species found parasng P. blochii. Seven species of Monogenoidea: 527 Demidospermus paravalenciennesi, 336 Demidospermus sp., 321 Demidospermus uncusvalidus, 223 Ameloblastella satoi; 123 Ameloblastella sp.1; 109 Ameloblastella sp.2 and 34 Ameloblastella sp.3. Two species of Digenea: thirteen specimens of Dadaytrema oxycephala and nine metacercariae of Diplostomum spathaceum. One species of Nematoda: 20 larvae of Anisakis sp. One species of Copepoda: ten individuals of Ergasilus sp. One species of Branchiura: one specimen of Argulus chicomendesi. The central species were: A. satoi, D. uncusyalidus, D. parayalenciennesi and Demidospermus sp. 1. The secondary species were Ameloblastella sp.1 and Ameloblastella sp.2. The satellites were: Ameloblastella sp.3, Austrodiplostomum compactum, Dadaytrema oxycephala, Anisakis sp. And Ergasilus sp. The parasite species presented aggregate distribuition. Only the abundance of A. satoi and D. parayalenciennesi presented positive correlation significant with the length of P. blochii. The indices of biodiversity indicated that the complex of lakes from Catalão have low diversity of parasitic in P. blochii.