Table 2. Comparison of bacterial colony numbers (colony forming units/ml or cfu/ml) of three bacterial isolates on dilution plates of basal medium (BM) and BM supplemented with aquatic weed extracts (1:100 dilution).

Isolate No.	Bacterial colony number (cfu/ml) on				P value
	Control (BM)	BM + Muskgrass	BM + Water hyacinth	BM + Filamentous algae
11	16±3 at 10−4 (a)	13±5 at 10−4 (a)	ND	ND	0.386
58	37±7 at 10−4 (a)	ND	21±5 at 10−4 (a,b)	17±1 at 10−4 (b)	0.011
72	12±4 at 10−2 (a)	15±8 at 10−2 (a)	ND	ND	0.540

ND = Not determined

Values are the means of three plate counts. For each isolate and on each line, values followed by the same letter in parentheses are not significantly different at P = 0.05 (One-way ANOVA).