Relação hospedeiro-parasita entre a sardinha-papuda Triportheus trifurcatus (Castelnau, 1855) e o parasita isópoda do gênero Anphira sp. (Thatcher 1993) no lago de Tucuruí, Amazônia

Abstract

The environment undergoes dynamic changes and with the implementation of a hydroelectric plant in a certain region the changes become even more evident, and therefore, the work was carried out with specimens captured in the Tucuruí lake. With the objective of analyzing the host-parasite relationship in the papuda sardine, Triportheus trifurcatus (Castelnau, 1855) by the isopod of the genus Anphira sp. in the Tucuruí lake, Amazon, where 13 infected fish were collected and the host (fish) and the parasite's form of parasitization (isopoda) were described, making prevalence estimates of 7.602%, intensity of 1.308 and average abundance of 0.099. There was no significant difference in the number of sardines parasitized by sex using the chi-square test with degree of freedom 2 and calculated ꭕ² 0.346 lower than the tabulated ꭕ² 3.14. The correlation between host and parasite sizes showed low values, a very weak correlation positive with a Pearson coefficient of 0.086. Concluding that the occurrence of the parasite is a satellite in relation to sardines. Observing the predominance of parasites in the rainy season and with the ability to parasitize the mouth and gills of any large sardine regardless of size.