Endoparasitos em diferentes espécies de peixes redondos em piscicultura de Laranjal do Jari (AP)

Abstract

This study aimed to conduct an endoparasitic analysis of the stomach content of round fish from fish farms in Laranjal do Jari, in the state of Amapá, in the Amazon region. A total of 45 specimens of round fish, 25 of Colossoma Macropomum x Piaractus brachypomus (Tambatinga), 11 of Colossoma macropomum (tambaqui), 7 of Mylossoma (Pacu), and 2 of Piaractus brachypomus (Pirapitinga), underwent analysis, revealing a prevalence of 15.5% of them being parasitized by endoparasites. It was identified that five types of Capillaria, three nematodes, and one acanthocephalan were present in two specific fish: Colossoma macropomum (tambaqui) and Piaractus brachypomus (pirapitinga). Morphometric results showed that Piaractus brachypomus presented the greatest total length, 38.0 ± 9.9 (cm), with a weight variance of 38.0 ± 9.9 (g). On the other hand, Colossoma macropomum (tambaqui) registered the smallest length, 11.0 ± 1.4 (cm), and the lowest weight, 26.4 ± 10.1 (g). The other collected species of Mylossoma (pacu) had a total length of 20.0 ± 1.2 (cm) and an average weight of 191.8 ± 23.1 (g), while the species of Colossoma Macropomum x Piaractus brachypomus (Tambatinga) presented a total length of 30.7 ± 2.7 (cm) and the highest weight among the studied species, 614.6 ± 144.4 (g). No ectoparasites were identified in the analyzed species. Based on the calculated percentages, the distribution of endoparasites in the species was as follows: Piaractus brachypomus represented 33% of the parasitized species, Colossoma macropomum accounted for 67%, while Mylossoma and Colossoma Macropomum x Piaractus brachypomus did not present endoparasites. The detection of endoparasites was low, indicating a low parasitic infection in the analyzed specimens. Additionally, a significant correlation between the length and weights of the endoparasites found in the examined species was not identified. Therefore, further studies with more specimens are necessary to better portray the parasitic ecology of round fish species from fish farms in the region.