2.4. Microbiological investigations
The fungi infected black gills were removed from the infected shrimp and observed under a 40× lens in light microscope (Olympus).
The black gill infected shrimps black gill lamellae were washed three times with sterile physiological saline (0.85% NaCl) and plated on Sabourad dextrose agar plates supplemented with Amphotericin-B and streptomycin sulphate (25 μg/ml) to inhibit unwanted bacterial contamination.
Further, the plates were incubated for 4 days at 25 °C and the pure cultures were maintained at 25 °C on (give expansion) SDA slants for subsequent experiments. The fungal strainwas identified through Lacto phenol cotton blue mount (LPCB) and the morphology was observed under light microscopy.