| River basins | Sampling stations | Atyidae | Chironomidae | Physidae | ||
| Caridina africana | Caridina nilotica | Chironomus sp. | Aplexa sp. | Physa acuta | ||
| Sanaga | B1 | 72 (5.39%) | 9 (2.84%) | 40 (1.87%) | 0 (0.00%) | 12 (0.03%) |
| B2 | 37 (2.77%) | 6 (1.89%) | 31 (1.45%) | 1 (0.01%) | 27 (0.07%) | |
| B3 | 31 (2.32%) | 0 (0.00%) | 26 (1.22%) | 3 (0.05%) | 18 (0.04%) | |
| M1 | 69 (5.17%) | 1 (0.03%) | 48 (2.24%) | 25 (4.44%) | 130 (3.41%) | |
| M2 | 65 (4.87%) | 15 (4.73%) | 1111 (52.01%) | 179 (31.85%) | 1504 (39.40%) | |
| M3 | 66 (4.94%) | 85 (26.81%) | 750 (35.11%) | 354 (62.99%) | 2002 (52.44%) | |
| S1 | 483 (36.18%) | 101 (31.86%) | 58 (2.71%) | 0 (0.00%) | 3 (0.01%) | |
| S2 | 512 (38.35%) | 100(31.54%) | 72 (3.37%) | 0 (0.00%) | 121 (3.17%) | |
| Total | 1335 (100%) | 317(100%) | 2136(100%) | 562(100%) | 3817 (100%) | |
| Wouri | KO | 42 (4.64%) | 1(3.13%) | 407 (13.23%) | 131 (13.21%) | 2845 (22.43%) |
| LM | 45 (4.98%) | 3(9.37%) | 800 (26.01%) | 601 (60.64%) | 2088 (16.46%) | |
| MB | 0 (0.00%) | 0 (0.00%) | 471 (15.31%) | 7 (0.07%) | 2076 (16.36%) | |
| MG | 0 (0.00%) | 0 (0.00%) | 22 (0.07%) | 110 (11.10%) | 2356 (18.57%) | |
| MP | 0 (0.00%) | 0 (0.00%) | 367 (11.93%) | 7 (0.07%) | 1057 (8.33%) | |
| TB | 3 (0.03%) | 0 (0.00%) | 464 (15.08%) | 105 (10.59%) | 1163 (9.17%) | |
| TW | 13 (1.44%) | 0 (0.00%) | 467 (15.18%) | 24 (0.24%) | 803 (6.33%) | |
| WO | 801(88.61%) | 28 (87.50%) | 78 (2.54%) | 6 (0.06%) | 297 (2.34%) | |
| Total | 904 (100%) | 32 (100%) | 3076 (100%) | 991 (100%) | 12,685 (100%) | |