PART II - SYNTHESES OF INFORMATION ON SELECTED AFRICAN RESERVOIRS (continued)

PARTIE II - SYNTHESES DE L'INFORMATION SUR CERTAINS RESERVOIRS AFRICAINS (continuer)

KAINJI (NIGERIA) (continued)

Table 8. Percentage composition of fish by number, in gillnet catches for the year 1976 (estimated from a total of 137 gillnet fleets) and the relative distribution in the shore, surface and bottom samples (from Ita, 1978)

Family/Species	Number	%	Distribuion (%)
Family/Species	Number	%	Shore	Surface	Bottom
CHARACIDAE
Hydrocynus forskalii (Cuvier)	89	5.91	18.9	69.5	11.6
Alestes dentex (Cuvier & Valenciennes)	83	5.50	14.3	84.5	1.2
Alestes baremose (Joannis)	80	5.31	19.5	76.8	3.7
Alestes macrolepidotus (Cuvier & Valenciennes)	52	3.45	43.4	56.6	-
Alestes nurse (Ruppell)	42	2.78	56.8	-	-
Alestes brevis (Boulenger)	1	0.07	100.0	-	-
Hydrocynus brevis (Günther)	1	0.07	-	100.0	-
Total	348	23.09
MOCHOKIDAE
Synodontis batensoda (Ruppell)	67	4.44	45.7	50.0	4.3
Synodontis gambiensis (Günther)	60	3.98	12.3	7.4	80.2
Synodontis membranaceus (Geoffroy St. Hilaire)	51	3.38	26.8	51.8	21.4
Synodontis nigrita (Cuvier & Valenciennes)	30	1.99	41.2	32.4	26.5
Synodontis filamentosus (Boulenger)	30	1.99	100.0	-	-
Synodontis ocellifer (Boulenger)	29	1.92	40.6	40.6	18.8
Synodontis eupterus (Boulenger)	3	0.20	33.3	-	66.7
Synodontis schall (Bloch Schneider)	2	0.13	-	100.0	-
Synodontis budgetti (Boulenger)	1	0.07	-	100.0	-
Synodontis sorex (Günther)	1	0.07	100.0	-	-
Synodontis violaceus (Pellegrin)	1	0.07	-	100.0	-
Synodontis omias (Günther)	1	0.07	-	100.0	-
Total	276	18.31
CICHLIDAE
Sarotherodon galilaeus (Linnaeus)	128	8.50	74.6	24.6	0.8
Sarotherodon niloticus (Linnaeus)	41	2.72	62.8	37.2	-
Tilapia zilii Gervais	8	0.53	77.8	22.2	-
Total	177	11.75
CYPRINIDAE
Labeo senegalensis Cuvier & Valenciennes	139	9.22	63.9	10.9	25.2
Labeo coubie Ruppell	30	2.00	51.4	17.1	31.4
Labeo pseudocoubie Blache & Milton	5	0.33	66.7	33.3	-
Total	174	11.55
CITHARINIDAE/DISTICHODONTIDAE
Distichodus rostratus Günther	91	6.04	52.1	41.7	6.3
Citharinus citharus (Geoffory St. Hilaire)	49	3.25	36.4	40.0	23.6
Citharinus distichodoides Pellegrin	12	0.80	30.8	69.2	-
Total	152	10.09
BAGRIDAE
Chrysicthys auratus (Pfaff)	50	3.32	46.6	20.6	32.8
Chrysichthys nigrodigitatus	35	2.32	2.0	2.0	96.0
Bagrus bayad Pfaff	26	1.72	66.7	10.0	23.3
Clarotes laticeps Ruppell	12	0.80	92.3	-	7.7
Auchenoglanis occidentalis (Cuvier & Valencienne)	6	0.40	83.3	16.7	-
Bagrus docmac (Forskal)	4	0.20	40.0	-	60.0
Auchenoglanis biscutatus Geoffry & St. Hilaire	1	0.07	-	100.0	-
Total	134	8.89
SCHILBEIDAE
Eutropius niloticus (Ruppell)	68	4.51	9.0	48.7	42.3
Schilbe mystus (Linnaeus)	31	2.06	10.5	39.5	50.0
Physalia pellucida Boulenger	13	0.86	14.3	64.3	21.4
Total	112	7.43
MORMYRIDAE
Marcusensius senegalensis (Steindachner)	29	1.92	44.4	5.6	50.0
Hyperopisus bebe (Gunther)	14	0.93	11.8	35.3	52.9
Hyppopotamyrus pictus (Marcusen)	12	0.80	64.3	7.1	28.6
Mormyrops deliciosus (Leach)	7	0.46	77.8	11.1	11.1
Mormyrus rume Cuvier & Valenciennes	7	0.46	71.4	14.3	14.3
Mormyrus macrophthalmus Gunther	3	0.20	-	50.0	50.0
Marcusenius kainji sp.nov.	1	0.07	100.0	-	-
Marcusenius cyprinoides (Linnaeus)	1	0.07	100.0
Total	74	4.91
CENTROPOMIDAE
Lates niloticus (Linnaeus)	38	2.52	54.8	28.6	16.6
OTHERS
Ctenopoma kingsleyae Gunther	7	0.46	28.6	71.4	-
Gymnarchus niloticus Cuvier	4	0.26	80.0	20.0	-
Ghana obscurus (Gunther)	2	0.13	100.0	-	-
Arius gigas Boulenger	2	0.13	-	-	100.0
Heterotis niloticus (Cuvier)	1	0.07	100.0	-	-
Barilius niloticus (Joannis)	1	0.07	100.0	-	-
Hemichromis fasciatus Peters	1	0.07	100.0	-	-
Hepsetus odoe (Bloch)	1	0.07	100.0	-	-
Clarias anguillaris (Linnaeus)	1	0.07	100.0	-	-
Clarotes macrocephalus Daget	1	0.07	-	-	100.0
Barbus occidentalis Boulenger	1	0.07	100.0	-	-
Total	22	1.47
Grand total	1 507

Table 9. Relative abundance of fish caught in the cofferdammed lake (4.8.1966 to 21.8.1966) (from Motwani and Kanwai, 1970)

Fish species		Numbers caught	Total weight (kg)
MORMYRIDAE
	Hyperopisus occidentalis	166	48.81
	Mormyrus rume	91	29.69
	M. macrophthalmus	87	16.96
	M. hasselquisti	2	0.50
	Mormyrops deliciosus	84	36.45
	M. oudoti	37	17.84
	M. engystoma	1	0.45
	Petrocephalus bane ansorgei	12	0.27
	P. psittacus	29	0.76
	P. harringtoni	1	0.13
	P. isidori	1	0.04
	Gnathonemus tamandua	366	37.91
	G. abadii	140	12.74
	G. senegalensis	108	10.50
	G. deboensis	43	4.19
	G. pictus	26	1.52
	G. petersii	2	0.08
	G. niger	1	0.10
	G. cyprinoides	1	0.02
Total:		1 198	218.96
Percentage of Total Catch:		20.70	19.54
CHARACIDAE
	Hydrocynus forskali	27	8.90
	H. lineatus	1	1.90
	Alestes baremose	942	64.75
	A. dentex	505	35.70
	A. leuciscus	498	4.16
	A. macrolepidotus	95	18.04
	A. nurse	34	2.69
	A. imberi	1	0.09
Total:		2 103	136.23
Percentage of Total catch:		36.27	12.16
CITHARINIDAE
	Distichodus rostratus	63	115.44
	D. engycephalus	3	2.68
	Citharinus citharus	276	91.13
	C. distichoides	9	1.17
	C. latus	3	1.62
Total:		354	212.04
Percentage of Total Catch:		6.10	18.92
CYPRINIDAE
	Labeo coubie	125	38.61
	L. senegalensis	53	8.50
	L. pseudocoubie	5	1.08
	Barbus occidentalis	1	0.03
	Barbus sp.	7	0.01
	Barilius senegalensis	1	0.04
Total:		192	48.27
Percentage of Total Catch:		3.30	4.30
SCHILBEIDAE
	Schilbe mystus	350	33.95
	Eutropius niloticus	98	6.60
	Physailia pellucida	15	0.10
Total:		463	40.65
Percentage of Total Catch:		8.00	3.63
BAGRIDAE
	Bagrus docmac	148	121.24
	B. bayad	39	36.12
	Chrysichthys auratus	106	8.41
	C. nigrodigitatus	89	8.56
	C. furcatus	9	11.03
	Clarotes laticeps	25	13.47
	C. macrocephalus	6	5.38
Total:		422	204.21
Percentage of Total Catch:		7.25	18.22
MOCHOCIDAE
	Synodontis gobroni	392	54.75
	S. gambiensis	152	12.49
	S. budgetti	125	61.49
	S. membranaceus	116	45.38
	S. violaceous	58	5.02
	S. courteti	53	13.03
	S. vermiculatus	53	7.04
	S. sorex	27	2.08
	S. ocellifer	19	1.15
	S. resupinatus	19	2.90
	S. batensoda	11	0.88
	S. robbianus	10	0.33
	S. melanopterus	9	0.19
	S. clarias	7	0.89
	S. nigrita	5	0.46
	S. schall	3	0.30
	S. omias	3	1.08
	S. filamentosus	2	0.04
Total:		1 044	209.50
Percentage of Total Catch:		18.00	18.68

Table 10. Summary of fish catches in River Niger (1965 and 1966) and Kainji Lake (1969) (from Imevbore and Okpo, 1975)

Families	River 1965	River 1966		Lake 1969
Families	% No.	% No.	% Wt.	% No.	% Wt.
characidae
Alestes longipinnis	-	-	-	0.02	0.001
A. dentex	2.44	8.71	3.34	0.02	0.001
A. baremose		16.25	6.05	0.42	0.03
A. macrolepidotus	0.32	1.64	1.67	0.12	0.08
A. nurse	1.12	0.59	0.25	0.38	0.03
A. imebri		0.017	0.008	-	-
A. leuciscus		8.59	0.39	-	-
Hepsetus odoe	0.37			-	-
Hydrocynus forskalii		0.47	0.83	0.07	0.20
H. vittatus (lineatus)	0.32	0.017	0.18	0.70	1.83
total %	4.57	36.28	12.72	1.73	2.17
mormyridae
Mormyrops deliciosus	0.22	1.45	3.41	-	-
M. macrophthalmus	1.97	1.50	1.59	-	-
M. rume	0.22	1.57	2.78	0.24	0.31
M. hasselquisti	0.05	0.03	0.05	0.10	0.02
Gnathonemus senegalensis	0.13	1.86	0.98	-	-
G. pictus	0.15	0.45	0.14	-	-
G. tamandua	1.90	6.32	3.54	-	-
Hyperopisus bebe	-	2.86	4.56	0.02	0.02
Petrocephalus bane	0.70	0.21	0.03	0.02	0.001
Mormyrops oudoti	0.70	0.63	1.67	0.02	0.001
M. engystoma		0.017	0.04	-	-
Petrocephalus psittacus		0.50	0.07	-	-
P. harringtoni		0.017	0.01	-	-
P.isoderii		0.017	0.004	-	-
Gnathonemus abadii	11.13	2.42	1.19	0.02	0.006
G. debonensis		0.74	0.39	-	-
G. petersii	-	0.03	0.007
G. niger	-	0.017	0.009
G. cyprinoides	-	0.017	0.002	0.16	0.03
total %	17.17	20.66	20.47	0.58	.39
cyprinidae
Labeo senegalensis	1.95	0.91	0.79	0.35	0.49
L. coubie	0.45	2.16	3.61	3.43	4.60
L. pseudocoubie	-	0.09	0.10	0.54	0.84
Other Labeo spp.	1.00
Barbus occidentalis	0.03	0.077	0.003	0.02	0.03
Barbus sp.	-	0.12	0.001	-	-
Barilius senegalensis	-	0.017	0.004	-	-
total %	3.43	3.37	4.51	4.34	5.96
cichlidae
Tilapia nilotica	2.17	-	-	0.26	0.15
T.galilaea	0.65	-	-	1.53	1.14
T. zilli	0.92	-	-	-	-
T. melanopleura	-	-	-	0.03	0.002
T. monodi	-	-	-	0.10	0.01
Hemichromis fasciatus	0.05	-	-	0.05	0.01
Pelmatochromis guentheri	-	-	-	-	-
total %	3.79			1.97	1.31
citharinidae
Distichodus rostratus	1.55	1.09	10.79	0.12	0.24
D. engycephalus	0.20	0.05	0.25	-	-
D. brevipinnis	1.27			0.03	0.004
Citharinus citharus	16.71	4.76	8.52	69.56	67.76
C. latus	3.99	0.05	0.15	2.04	4.31
C. distichodoides	0.50	0.16	0.11	2.33	1.84
Citharidium ansorgei	0.15			0.03	0.004
total %	24.37	6.11	19.82	74.11	74.16
centropomidae
Lates niloticus	0.27	-	-	2.16	2.96
total %	0.27	-	-	2.16	2.96
schilbeidae
Schilbe mystus	2.49	6.04	3.17	0.26	0.08
Eutropius niloticus	2.97	1.69	0.62	0.02	0.01
Siluranodon auritis	-			0.02	0.001
Physalia pellucida	-	0.26	0.009	0.09	0.001
Other spp.	0.03	-	-	-	-
total %	5.49	7.99	3.80	0.39	0.09
bagridae
Chrysicthys nigrodigitatus	0.52	1.54	0.80	0.05	0.01
Chrysicthys auratus	-	1.83	0.79	0.64	0.13
C. furcatus	-	0.16	0.13	-	-
Bagrus bayad	0.27	0.67	3.38	0.12	0.27
B. filamentosus	-			0.03	0.05
B. docmac	0.05	2.55	11.33	-	-
Auchenoglanis occidentalis	0.25			0.91	0.79
A. biscutatus	-			0.05	0.06
Clarotes laticeps	0.67	0.43	1.26	0.10	0.01
Clarotes macrocephalus	-	1.04	0.50	-	-
Other spp.	0.89	-	-	-	-
total %	2.65	8.22	18.19	1.90	1.32
mochokidae
Synodontis membranaceus	0.96	2.00	4.24	7.91	6.49
Other spp.	19.03
Synodontis gobroni		6.76	5.12	0.12	0.02
S. gambiensis		2.62	1.17	0.16	0.03
S. budgetti		2.16	5.75	0.09	0.04
S. violaceous		1.00	0.50	-	-
S. courteti		0.91	1.22	0.03	0.004
S. vermiculatus		0.91	0.66	-	-
S. sorex		0.47	0.19	0.56	0.20
S. ocellifer		0.33	0.11	0.51	0.03
S. resupinatus		0.33	0.27	-	-
S. batensoda		0.19	0.08	0.42	0.22
S. robbianus		0.17	0.03	-	-
S. melanopterus		0.16	0.02	0.02	0.003
S. clarias		0.12	0.08	0.42	0.09
S. nigrita		0.09	0.04	0.07	0.01
S. schall		0.05	0.03	0.16	0.02
S. eupterus				0.38	0.03
S. omias		0.05	0.1	-	-
S. filamentosus		0.03	0.004	-	-
total %	19.99	18.35	19.61	10.85	7.19