Branchial histopathological study of Brachyplatystoma rousseauxii (Castelnau, 1855) in the Guajará bay, Belém, Pará State, Brazil - DOI: 10.4025/actascibiolsci.v32i1.4800. Acta Sci. Biol. Sci. 2009;32(1):93-99. doi:10.4025/actascibiolsci.v32i1.4800