Table 6. Biotic indices at the sampling sites (mean±S.D)

Biotic index\Site	St. 1	St. 2	St. 3	St. 4	St. 5	St. 6	Average
TESB biological grading evaluation (A–D)	56.5C	82.5B	63.5C	77.0B	83.0B	53.5C	69.3 ± 19.5C
AESB biological grading evaluation (A–D)	4.28A	4.21A	4.23A	4.04A	3.97A	3.96A	4.11 ± 0.19A