3. Result
3.1. Microscopical and histopathological observations
The external clinical symptoms of L. vannamei with black gill infection
were observed as black colour appearance on the surface of the
gill. The normal gill of L. vannamei, and conidia of attached fungal
were encapsulated at the base of the gill observed in the infected shrimp
under light microscope (Fig. 1). The results of histological examination
evidenced that the normal gill lamella. Cross-section of haemocoel in
gill tissue, and encapsulated hyphae were observed in the gills and at
the base of the gills haemocytic infiltration is surrounded by large
amounts of substances caused by coagulation necrosis (Fig. 2).
nih.gov) and was aligned with reference taxa along with their GenBank
accession numbers using ClustalW implemented in MEGA5 software
(Tamura et al., 2011).