Table 2. Ichthyodiversity in the upstream and downstream regions of Koto Panjang Reservoir in January to December 2018.

Family/species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Total
Cyprinidae
Barbodes schwanifeldi	20	25	30	39	40	42	45	50	57	49	40	35	472
Crossocheilus oblongus	3	5	3	6	5	7	8	12	15	8	4	5	81
Crossocheilus langei	0	0	4	4	8	5	6	8	7	5	3	0	50
Labiobarbus festifus	8	12	10	9	13	15	15	17	21	25	12	11	168
Cyclocheilichthys apogon	3	3	2	5	10	15	18	14	11	8	5	4	98
Hampala macrolepidota	0	0	1	1	0	2	3	2	4	1	1	1	16
Osteochilus hasselti	14	16	20	36	30	39	42	40	40	34	29	25	365
Osteochilus schlegeli	0	0	1	2	5	6	5	8	2	3	2	2	36
Osteochilus vittatus	23	25	20	18	28	21	15	23	26	18	13	10	240
Osteochilus pleurotaenia	15	20	23	29	34	30	35	29	27	22	15	12	291
Oxygaster anomalura	6	7	12	13	9	15	15	17	13	11	9	7	134
Puntioplites bulu	30	31	35	29	28	35	30	24	25	19	32	28	346
Rasbora argyrotaenia	60	40	50	55	60	65	75	70	65	60	52	50	702
Thynnichthys polilepis	15	18	21	25	19	24	26	22	19	21	20	15	245
Leptobarbus hoevenii	0	1	2	3	2	5	4	3	3	2	1	1	27
Cyprinus carpio	0	0	1	3	3	5	2	2	3	1	1	0	21
Bagridae
Hemibagrus nemurus	32	34	35	38	40	43	38	40	51	58	53	35	497
Hemibagrus wyckii	0	0	0	0	1	1	2	2	1	0	0	0	7
Mystus nigriceps	23	25	22	26	28	30	31	38	32	25	28	20	328
Mystus micracanthus	0	0	0	0	1	5	4	4	3	1	0	1	19
Claridae
Clarias teijsmanni	12	15	14	18	21	22	26	29	22	23	17	16	235
Pangasidae
Pangasius pangasius	0	0	0	0	1	1	1	1	1	1	1	1	8
Pangasianodan hypophthalmus	0	1	2	4	5	5	8	3	2	3	2	2	37
Siluridae
Ompok hypophthalmus	45	42	45	48	43	51	55	50	45	41	38	35	538
Wallago leerii	10	12	18	23	10	14	24	20	19	16	14	9	189
Gobitidae
Chromobotia macrachantus	0	0	0	1	2	2	8	5	6	0	0	0	24
Chromobotia hymenophysa	0	1	1	2	2	1	1	3	0	0	0	0	11
Acanthopsis octoactinatus	0	2	1	1	3	1	3	4	6	2	1	2	26
Tetradontidae
Tetraodon palembangensis	3	4	2	4	5	12	18	21	18	15	12	5	119
Anabantidae
Anabas testudineus	0	0	8	12	18	15	21	30	18	17	23	15	177
Belontiidae
Thrichogaster trichopterus	0	0	0	0	1	2	3	3	2	5	3	2	21
Channidae
Channa lucius	12	14	10	16	21	25	28	31	38	12	9	5	221
Channa striata	19	21	17	25	26	32	38	40	32	29	17	9	305
Channa micropeltes	0	0	1	2	0	4	6	7	5	1	1	0	27
Channa pleurothalmus	0	0	0	0	0	0	2	2	0	1	0	0	5
Eleotridae
Oxyeleotris marrmorata	9	15	14	21	19	16	18	21	19	17	13	8	190
Helostomatidae
Helostoma temmincki	0	0	0	5	8	11	15	23	29	32	15	11	149
Mastacembelidae
Mastacambelus unicolor	3	5	6	7	8	8	6	7	12	11	8	8	89
Osphronemidae
Osphronemus gouramy	0	0	0	4	3	6	7	10	8	13	15	9	75
Pristolepididae
Pristilepis grooti	5	8	12	11	15	19	13	18	22	23	19	16	181
Cygnolossidae
Cygnolossus microlepis	3	9	8	11	15	19	23	21	19	15	14	12	169
Notopteridae
Chitala lopis	3	5	6	6	8	9	14	13	20	21	16	15	136
Hemiramphidae
Hemiramphus chrysopunctatus	4	7	8	11	13	9	15	21	19	23	14	12	156
Cichlidae
Oreochromis niloticus	57	61	69	62	59	60	76	65	67	80	69	61	786
Grand total	437	484	534	635	670	754	848	873	854	772	641	515	8017
Percentage population	5.45	6.04	6.66	7.92	8.36	9.41	10.58	10.89	10.65	9.63	8.00	6.42
Total species	26	30	36	39	41	43	44	44	42	41	39	37
Percentage diversity	59.09	68.18	81.82	88.64	93.18	95.45	100	100	95.45	93.18	88.64	86.36