Effect of parasitic load of Rondonia rondoni, Travassos, 1920 (Nematoda, Atrictidae) over the condition factor of thorny catfish Pterodoras Granulosus (Valenciennes, 1833) (Pisces, Doradidae) - DOI: 10.4025/actascibiolsci.v26i2.16

Abstract

Aiming to evaluate the effect of parasitic load of Rondonia rondoni over the condition factor of Pterodoras granulosus. Fifty one specimens of P. granulosus were collected in Paraná River, (Porto Rico/Paraná). To analyze were used: Student’s “t”, to determine if length of hosts males and females were similar; Mann-Whitney test “U”, to determine the effect of sex of host on the intensity of infestion of the parasite; “G” Log-likelihood test, to determine the effect of sex of the host on the prevalence of parasite; coefficient of correlation “r”, to determine the correlation between the length of host and the prevalence of infection; Spearman rank correlation coefficient “rs”, to determine as possible correlation’s between the intensity of infection and the parasitic diversity with the length of the host, and to examine the correlation between the parasitic intensity and the condition factor (K). Based in this results we conclude, that despite of variations in the length, between males and females, the sex does not influence in the intensity and prevalence of infection. However, the intensity of parasites and the prevalence of R. rondoni increased with the length of host being that, the intensity does not affect the condition factor of Pterodoras granulosus, which mean to be in equilibrium with the parasite in this local