“The Pathogen index in freshwater drum (Aplodinotus grunniens R.) from the usumacinta river in southeastern mexico (Aplodinotus grunniens R.) from the usumacinta river in southeastern mexico: Pathogen index in freshwater drum from the usumacinta river ” (2024) Agro Productividad [Preprint]. doi:10.32854/agrop.v17i8.2831.