Assessment of Performance, Microbial Community, Bacterial Food Quality, and Gene Expression of Whiteleg Shrimp (Litopenaeus vannamei) Reared under Different Density Biofloc Systems

Table 6

Biochemical test results of different isolated bacteria using API 20E diagnostic strips from shrimp and tanks under biofloc system under high (300/m²) and lower (100/m²) stocking density.

	Stocking density
	300/m^2				100/m^2
	Water		Shrimp		Water	Shrimp
	Cronobacter spp.	Enterobacter cloacae	Citrobacter freundii	Aeromonas Hydrophila	Enterobacter cloacae	E. coli
ONPG	+	+	+	+	+	+
Arginine dihydrolase	+	+	+	+	+	+
Lysine decarboxylase	—	—	—	+	—	+
Ornithine decarboxylase	+	+	+	—	+	—
Citrate	+	+	+	—	+	—
H2S	—	—	+	—	—	—
Urease	—	—	—	—	—	—
TDA	+	+	+	—	—	—
Indole	—	—	—	—	—	+
Voges-Proskauer	—	+	—	+	+	—
Gelatinase	+	—	+	+	—	—
Acid from:
Glucose	+	+	+	+	+	+
Mannitol	+	+	+	+	+	+
Inositol	—	—	—	—	—	—
Sorbitol	+	+	+	—	+	+
Rhamnose	+	+	+	—	+	+
Sucrose	+	+	+	+	+	+
Melibiose	+	+	+	—	+	+
Amylose	—	+	+	—	+	—
Arabinose	+	+	+	—	+	+