Research Article
Physicochemical Parameters and Fish Assemblages in the Downstream River of a Tropical Hydroelectric Dam Subjected to Diurnal Changes in Flow
Table 4
Summary of the fish assemblages at the downstream river of Batang Ai.
| Family | Species | Upstream | Middle stream | Downstream | Total | Count | % | Count | % | Count | % | Count | % |
| Bagridae | Hemibagrus nigriceps | 0 | 0 | 2 | 1 | 0 | 0 | 2 | 0.5 | Hemibagrus planiceps | 15 | 17 | 16 | 10 | 16 | 8 | 47 | 10.8 |
| Channidae | Channa striata | 1 | 1 | 6 | 4 | 1 | 1 | 8 | 1.8 |
| Clariidae | Clarias batrachus | 3 | 3 | 2 | 1 | 2 | 1 | 7 | 1.6 |
| Cyprinidae | Barbonymus schwanenfeldii | 3 | 3 | 1 | 1 | 2 | 1 | 6 | 1.4 | Cyclocheilichthys apogon | 45 | 52 | 70 | 46 | 95 | 48 | 210 | 48.2 | Cyclocheilichthys armatus | 1 | 1 | 2 | 1 | 0 | 0 | 3 | 0.7 | Hampala macrolepidota | 5 | 6 | 16 | 10 | 27 | 14 | 48 | 11.0 | Osteochilus enneaporos | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0.2 | Osteochilus schlegelii | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0.2 | Osteochilus waandersii | 0 | 0 | 6 | 4 | 4 | 2 | 10 | 2.3 | Puntius binotatus | 3 | 3 | 2 | 1 | 5 | 3 | 10 | 2.3 | Rasbora caudimaculata | 3 | 3 | 4 | 3 | 0 | 0 | 7 | 1.6 |
| Eleotridae | Oxyeleotris marmorata | 5 | 6 | 5 | 3 | 8 | 4 | 18 | 4.1 |
| Mastacembelidae | Mastacembelus erythrotaenia | 0 | 0 | 5 | 3 | 3 | 2 | 8 | 1.8 |
| Osphronemidae | Osphronemus goramy | 3 | 3 | 14 | 9 | 23 | 12 | 40 | 9.2 |
| Toxotidae | Toxotes microlepis | 0 | 0 | 1 | 1 | 9 | 5 | 10 | 2.3 |
| Total number of species | 11 | 100 | 16 | 100 | 13 | 100 | 17 | 100 |
| Total number of fish caught | 87 | | 153 | | 196 | | 436 | |
| Shannon’s diversity index, H (e) | 1.7 | | 1.9 | | 1.7 | | 1.9 | |
| Margalef’s richness index, D (e) | 2.2 | | 3.0 | | 2.3 | | 2.6 | |
| Pielou’s evenness index, J (e) | 0.7 | | 0.7 | | 0.7 | | 0.7 | |
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