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 25
Estimated total catch per boat per year by commercial fishermen in Kainji Lake (From Ita, 1981)

YEAR	1969	1970	1971	1972	1973	1974	1975	1976	1977	1978
Landings in metric tons	17 000	28 639	11 037	10 905	7 320	6 093	6 000	5 800	4 500	4 500
Number of fishing boats	1 800	3 400	3 500	3 500	3 500	3 400	3 400	3 400	3 300	3 300
Mean catch per boat in metric tons	9.4	8.4	3.2	3.1	2.1	1.8	1.8	1.5	1.4	1.4

Table 26
Observed maximum weight, density, standing crop per hectare etc., for the major commercial species in Kainji Lake
(From Ita, 1981b)

Fish species	Observed Maximum Wt. (kg)	Density per hectare	Standing Crop per Hectare (kg)	Approx. Standard Length (mm) at Maturity of female Fish	Mean Standard Length (mm) at Entry into two Inch Net	Susceptible to Capture before Maturity
Lates niloticus	100.0	116.7	2.8	240	184	YES
Malapterurus electricus	20.0	42.1	5.9	-	-	-
Hydrocynus vittatus	15.0	0.3	0.02	210	230	NO
Bagrus docmac	12.5	5.5	1.0	300	165	YES
Clarotes laticeps	10.0	45.5	1.9	300	165	YES
Mormyrops deliciosus	10.0	11.4	0.4	420 (TL)	240	YES
Clarias anguillaris	7.0	16.0	3.5	500 (TL)	-	YES
C. lazera	7.0	15.5	1.9	500	-	YES
Mormyrus rume	5.0	12.7	1.7	369	240	YES
Citharinus distichodoides	4.6	7.5	0.4	535	120	YES
Bagrus bayad	3.5	71.0	15.6	412	165	YES
Citharinus citharus	3.0	184.4	33.1	345	221	YES
Labeo coubie	3.0	32.6	3.0	546	190	YES
L. pseudocoubie	3.0	8.7	0.5	546	190	YES
Auchenoglanis occidentalis	2.0	144.2	5.8	200	165	YES
Hydrocynus forskahlii	2.0	7.9	2.0	210	240	NO
Sarotherodon niloticus	2.0	324.3	35.2	135	135	YES
Distichodus rostratus	2.0	37.8	2.0	300	159	YES
Auchenoglanis biscutatus	2.0	7.1	1.5	200	165	YES
Alestes macrolepidotus	2.0	201.3	6.2	200	190	YES
Labeo Senegalensis	1.5	279.9	9.0	310	182	YES
Sarotherodon galileaus	1.5	1 470.0	42.4	126	185	NO
Synodontis membranaceus	1.5	18.7	0.4	245	186	YES
Chrysichthys nigrodigitatus	1.5	38.9	0.7	171	192	NO
Channa obscurus	1.0	4.2	0.4	-	280	-
Hyperopisus bebe	1.0	1.9	0.1	307	240	YES
Synodontis vermiculatus	1.0	0.4	0.01	170	155	YES
Hepsetus odoe	0.8	0.2	0.1	-	256	-
Alestes dentex	0.6	144.8	5.4	230	205	YES
Synodontis gambiensis	0.5	33.7	1.3	171	155	YES
Tilapia zillii	0.3	559.2	25.0	88	135	NO
Alestes baremose	0.25	371.0	5.4	180–250	203	NO
Schilbe mystus	0.25	18.6	0.2	130–160	183	NO

TL = Total length

Table 27
Relationship between age and standard length (mm) of some larger fish species in Kainji Lake
(From Ita, 1981a)

	Standard Length (mm) at maturity	AGE								Source of information
	Standard Length (mm) at maturity	1	2	3	4	5	6	7	8	Source of information
Citharinus citharus	345	180	270	351	394	-	-	-	-	Arawomo (1972)
C. distichodoides	535	170	302	395	-	530	-	-	-	" "
Synodontis membranaceus	245	72	112	155	198	228	254	275	-	Willoughby (1974)
S. gambiensis	171	60	94	130	163	191	207	-	-	" "
Bagrus bayad	412	135	242	322	403	465	536	578	614	Ajayi (1972)
B. docmac	-	137	249	340	418	485	542	591	634	" "
Auchenoglanis occidentalis	388	145	250	312	356	390	-	-	-	" "
Chrysichthys nigrodigitatus	171	137	196	237	280	308	-	-	-	" "
Tilapia galilaea	126	140	262	356	399	432	-	-	-	Akintunde (1976) For example using Total Length
T. nilotica	135	165	295	383	428	456	-	-	-	Akintunde (1976) For Males using and Females using T.L.
T. zillii	88	146	209	235	256	-	-	-	-

Table 28
Comparison of fecundity rates of some larger fish species in Kainji Lake
(From Ita, 1981a)

Species	Total Length (mm) range	Standard Length (mm) range	Weight (g)	Ovary Wt. (g)	Fecundity Range	Mean No. of eggs	Source of information
Citharinus latus	-	345–385 (3)	1 500–2 370	-	161 840–305 250	244 680	Arawomo (1972)
C. distichodoides	-	535–(2)	4 500–4 600	-	325 200–684 500	519 850	" "
Lates niloticus	590–790 (3)			4.0–12.3	14 700–15 600	30 033	Motwani (1970)
Hydrocynus forskahlii	290–350 (2)		150–250	3.7–11.7	10 300–17 300	9 200	" "
Synodontis membranaceus	-	290–319 (8)	-	-	33 700–179 000	106 350	Willoughby (1974)
S. gambiensis	-	171–267 (10)	-	-	1 390–84 300	42 845	" "
Auchenoglanis occidentalis					5 300–16 000		Ajayi (1972)
Tilapia galilea					1 120–7 110	3 406	Akintunde (1976)
T. nilotica					250–5 020	3 315	" "
T. zillii					1 300–8 050	3 842	" "

Table 29
Production chart for Pilot Fisheries Scheme at Shagunu Station between July 1980 and December 1980
(From Ita and Eyo, 1981)

No.	Name of Fishermen	Materials Supplied	Amount of Loan Advanced	Quantity of Fish Supplied	Total Amount of Fish Supplied	Amount of Loan Repaid	Cash Paid to Fishermen	Outstanding Balance to Settle
1	Alh. Isa Sarkin Ruwa	1 Boat at 600.00, Engine 800.00 4 Bundles of net at 60.00 each	1 640.00	368 kg	286.50	167.50	119.00	1 472.50
2	Alh. Doge	1 Boat at 600, Engine 800 4 Bundles net at 60, 20 twines	1 670.00	616 kg	1 221.50	380.00	841.50	1 290.00
3	Alh. Umaru/Marafa	1 Boat at 600, Engine 800 4 Bundles net at 60, 20 twines	1 670.00	525.5 kg	1 040.50	270.00	770.50	1 400.00
4	Manu Shugaba	4 Bundles of net at 60 each 20 twines at 1.50	270.00	187.0 kg	234.25	189.00	45.25	81.00
5	Tuni Shagaba	Same as 4 above	270.00	109.0 kg	151.50	120.00	31.50	150.00
6	Alh. Garba Shagunu	Same as 4 above	270.00	56.0 kg	90.50	90.50	-	179.50
7	Ahmadu Mohammed	Same as 4 above	270.00	163.0 kg	128.00	117.00	11.00	153.00
8	Alh. Manu Shagunu	4 Bundles of net at 60 each	240.00	42.0 kg	51.00	51.00	-	189.00
9	Moh. Jirgi	Same as 4 above	270.00	57.0 kg	29.00	23.00	5.50	246.00
10	Ango Na Allah	Same as 4 above	270.00	51.0 kg	29.50	22.00	7.50	248.00
			6 840.00	2 174.5 kg	3 262.25	1 430.50	1 831.5	5 409.00

Table 30
Production chart for Pilot Fisheries Scheme at Shagunu Station between January 1981 and July 1981
(From Ita and Eyo, 1981)

Name of Fishermen	Materials Supplied	Amount of Loan Advanced	Quantity of Fish Supplied	Total Amount of Fish Supplied	Amount of Loan Repaid	Cash Paid to Fishermen	Outstanding Balance to Settle
Alh. Isa Sarkin Ruwa	Boat at 600, Engine 800 4 Bundles of Net at 40 each 20 Cords Twine at 1.00	1 652.5	414.6 kg	348.69	300.69	48.40	1 352.21
Manu Shugaba	Boat at 600, Engine 800 6 Bundles of Net at 40 each 50 Cords Twine at 1.00	1 771	374.1 kg	33.29	207.59	125.7	1 563.41
Alh. Marafa	Boat at 600, Engine 800	1 400	555.6 kg	482.03	309.83	177.4	1 090.17
Alh. Dogo	Boat and Nets	1 290	1 325.2 kg	2 030.27	428.86	1 601.41	861.14
Tunis Shugaba Yumu	Boat at 600, Engine 800 6 Bundles of Net at 40 34 Cords Twine at 1.00	1 824	195.7 kg	249.9	233.9	23	1 540.1
Alh. Garba Shagunu	Nets and Twines	419.5	2 891.1 kg	302.06	296.06	6	123.44
Ahmadu Moh Moh	Same as 6 above	153	18 kg	38	24	6	129
Alh. Manu Shagunu	Same as 6 above	189	31 kg	20.15	20.15	-	168.85
Moh. Jirgi	Same as 6 above	246.5	-	-	-	-	246.5
Ango Na Allah	Same as 6 above	248	-	-	10	-	238
Alh. Umaru	Same as 6 above	44	311.3 kg	203.37	44	159.37	-
Alh. Isyaku	Same as 6 above	45	328.82 kg	214.84	45	169.84	-
Mass Supply	-	-	332.7 kg	459.24	-	459.24	-
		9 282.5	4 176.12 kg	4 673.84	1 919.68	2 776.36	7 362.82

Table 31
Kainji Lake Research Institute

Station . . . . . . . MONAI. . . . . . . . . . . . . . . . . . . . Expt. Fisheries Pilot Scheme Production Chart: Summary for June 1981
(From Ita and Eyo, 1981)

Name of Fishermen	Total Wt. of Fish Sold (kg)	Species*	Rate/kg	Amount	Loan Repaid in kg/	Amount of Loan Repaid
Musa Biyo	433.2	Tilapia	50	249.50	155.4	81.35
		Lates	2.00
Alh. Mohamadu Adama	412.2	Tilapia	50	205.80	74	37.00
Garba Goge	720.2	Til. & Cic.	50 & 60	361.10	108.2	57.40
		Bagrus	50
Unori Sani	412.9	Tilapia	50	208.10	103.2	49.30
		Hen., Cla.	1.00
Chuoru Kantama	354.6	Tilapia	50	175.40	68.5	34.45
		Til. & Lab.	50
Sule Musa	256.2	Tilapia	50	128.40	80.8	40.90
		Til. & Het.	50 & 1
Alh. Idrisu Mohamadu	252.0	Tilapia	50	137.60	82.7	47.50
		M. Elect.	1.00
Umoru Sabuke	20.0	Tilapia	50	9.90	12	6.00
Sarilhi Engineer	254.6	Tilapia	50	127.20	76.5	39.00
		Bagrus	50
Alh. Shuibu Tada	279.2	Tilapia	50	141.15	62.8	27.50
		Lates	2.00
TOTAL						420.40

* Til.= Tilapia Cic.= Citharinus Hen.= Heterotis Lab.= Labeo M. Elect. = Melapterurus

Price for other species range between 0.50 k and 1.00
N.B. US$ 1.00 = 0.66

Table 32
Kainji Lake research Institute

Station . . . . . . . MONAI. . . . . . . . . . . . . . . . . . . .Expt. Fisheries Pilot Scheme Production Chart: Summary for July 1981
(From Ita and Eyo, 1981)

Name of Fishermen	Total Wt. of Fish Sold (kg)	Species*	Rate/kg	Amount	Loan Repaid in kg	Amount of Loan Repaid
Musa Biyo	346.2	Til. & Bab.	50 & 1	187.10	85.5	48.00
		Mod., Bab., Lat.	50 & 1
Garba Goge	408.0	Til. & Hen.	50	203.90	21.0	10.80
		Til. & Bagrus	1
Umoru Sani	250.9	Tilapia	50	125.40	60.8	29.40
		Til. & Cic.	50 & 60
Umoru Maitama	274.9	Tilapia	50	137.45	25.2	13.20

Sule Musa	168.6	Tilapia	50	96.95	53.5	26.75
		Til., Cic., Lat.	50, 60, 2
Alh. Idrisu Mohammed	123.1	Tilapia	50	62.40	35	19.00
		M. Elect.	1
Umoru Sabuke	18.8	Tilapia	50	9.50	10	5.00

Sariki Engineer	252.1	Tilapia	50	131.05	66.9	39.05
		Lates & Gyn.	2
Alh. Mohamadu Adama	249.3	Tilapia	50	124.20	37.6	19.10
		Bagrus	1
Alh. Shuibu Tada	278.5	Tilapia	50	139.10	46.3	23.30
		Aub. & Bagrus	1
TOTAL						233.60

* Gyn. = Gymnarchus Aub. = Auchenoglanis Mob. = Mormyrops

N.B. US$ 1.00 = 0.66 Nigerian Naira

Table 33
Financial Analysis for the Operation of a Fishery Development Pilot Scheme at a Station in Kainji Lake (From Ita and Eyo, 1981)

1.	CAPITAL OUTLAY
	(a)	Buildings
		(i)	Fish processing complex			40 000
		(ii)	Smoking kilns building			2 000
		(iii)	Fish meal shed			2 000
		(iv)	Senior staff quarters (2 units)			60 000
		(v)	Junior staff quarters (12 units)			120 000
		(vi)	Guest house			30 000
				Sub-Total		214 000

	(b)	Equipment
		(i)	Cold storage plants			50 000
		(ii)	Smoking kilns			10 000
		(iii)	Blast freezers			15 000
		(iv)	Plate freezers			15 000
		(v)	Mincing and deboning machine			10 000
		(vi)	Fish meal plant			100 000
		(vii)	Laboratory equipment			5 000
		(viii)	Fuel storage tanks and mechanical equipment			30 000
		(ix)	Ice making plant			20 000
		(x)	Insulation boxes			10 000
		(xi)	Cabinet chillers			10 000

	(c)	Vehicles and Vessels
		(i)	Refrigerated van and insulated vessel			30 000
		(ii)	Pick-up van and land cruiser			15 000
		(iii)	Boats (5)			3 000
		(iv)	Engines and parts (5)			9 000
				Sub-Total		332 000

2.	RECRUITEMENT EXPENDITURE
	(a)	Staff
					No.	Salary p.a.

		(i)	Senior research development officer	GL 10	(1)	5 760.00
		(ii)	Food technologist	GL 08	(1)	3 564.00
		(iii)	Technician	GL 06	(1)	2 142.00
		(iv)	Lab. attendant	GL 02	(1)	942.00
		(v)	Boat driver	GL 04	(1)	1 320.00
		(vi)	Motor driver	GL 04	(2)	2 640.00
		(vii)	Stores assistant	GL 03	(1)	1 044.00
		(viii)	Salesman	GL 03	(1)	1 044.00
		(ix)	Labourers	GL 01	(2)	1 692.00
		(x)	Guards	GL 01	(2)	1 692.00

	(b)	Allowances				5 000.00
	(c)	Staff development and tech. assist.				5 000.00
	(d)	Vehicle maintenance and running costs				5 000.00
				Sub-total		36 840.00
				Grand Total		582 840.00