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