Metazoários parasitas de pterygoplichthys pardalis (castelnau, 1855) (ostheichthyes: loricariidae) de lagos de várzea do rio solimões entre manaus e coari, estado do amazonas, brasil

Abstract

The parasitic fauna of 85 individuals of P. pardalis was studied. Forty males and 45 females were captured at four floodplain lakes during the months of March, June, August and October of 2007. Weighing an average of 145.5±74.5g and with a standard length of 19.1±3.8cm. One hundred and eighty-three parasitic of eight species were collected: 40 individuals from Dactylogyridae, one Dolops geayi (Branchiura) and three Nematoda larvae parasitizing the gills; 37 (29.4%) metacercariae of Diplostomum sp.1 the eyes; 26 (8.2%) metacercariae of Diplostomum sp.2 and 6 (3.5%) Megacoelium spinicavum adults the stomachs; 26 (8.2%) metacercariae of Diplostomum sp.3 the gonads and 44 (25.8%) Gorytocephalus sp. the intestine. No parasite species showed significant correlation between the standard length and their abundance. Abundance, diversity and dominance not showed significant differences (p=0.06, p=0.98, p=0.0719 respectively).