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Table 7.3 Species composition of mutobi scoop nets by mesh size (Ruwet, 1961)

Net mesh in cm3.03.54.04.55.0
No.%No.%No.%No.%No.%
Cichlidae          
Tilapia macrochir          
<<Makoki>>
99349.501 08664.141 42374.501 05783.6977288.03
T. melanopleura          
<<Kituku>>
63431.6136421.5033617.5917714.019410.72
T. sparrmani          
<<Kifinsa>>
35317.0021512.7011305.911401.11500.57
Seronochromis          
kafuensis200.09900.53700.37600.48400.46
<<Makobo>>
          
Haplochromis mellandi1500.751200.711800.94300.24100.11
<<M'bilia>>
          
Siluridae          
Clarias gariepinus----1100.58600.48100.11
<<Kabambale>>
          
Cyprinidae          
Barbus paludinosus900.45700.41200.10----
<<N'dagala>>
          
TOTAL2 006100.001 69399.991 91099.991 263100.01877100.00

Table 7.4 Species composition data according to biotope, obtained through experimental fishing (Ruwet, 1961)

BiotopesT. macrochir %T. melanopleura %T. sparrmani %Serranochromis kafuensis %Haplochromis mellandi %Clarias gariepinus %Number of fish examined
Grassy plains dominated by Oryza33.5062.6801.1600.45-02.211 991
Grassy edges of channels39.2749.7800.4302.7900.2107.51    466
Waterlilies57.5531.3604.7302.0000.1804.181 100
Floating aquatic plants51.2831.9501.3807.2900.5907.49    507
Open water in channel69.4327.1500.3901.5500.3101.161 289
Open water95.3003.49---00.272 147

Table 7.5 Species composition data for two areas during various months of the year (Ruwet, 1961)

AreaT. macrochirT. melanopleuraT. sparrmaniSerranochromis HaplochromisSilures (Clarias)No of fish examinedNo. of fishing operations examined
Mulandi       
December 5972.6425.8900.2100.6500.6215.898-
January 6084.3113.8300.1501.1400.5610.503-
February84.4511.6400.2402.2801.3910.65564
March82.1815.3900.0901.0501.298.97161
April76.7716.2200.2402.6604.094.50141
May June53.0342.4501.2301.6101.678.18451
July50.4845.8700.7801.4501.4217.570106
 46.8945.6501.0502.3504.0613.64775
Lukoshi       
January87.3910.48-01.5100.444.306-
February79.3411.18-02.4707.018.17575
March73.1722.09-01.5803.1614.076102
April91.8705.35-02.0400.7424.972240
May90.4407.49-01.8700.2114.013190
June89.2406.84-02.6501.2711.911164

Table 7.6 Species composition data for all catches on the lake in the period 1957–1960 (Ruwet, 1961)

PeriodNumber of fish examinedT. macrochir %T. melanopleura %Cichlidae voraces %Clarias gariepinus %
195723 59484.393.601.3510.60
195831 48071.023.251.9823.74
      
X.59 - VII.60167 03675.8120.571.751.87

Table 8.1 Summary of high-water (June-July) and low-water (September-October) estimates of ichthyomass in metric (and short) tonnes for the Kafue Flats in 1970 (after Lagler et al., 1971).

Period of estimate, 1970Ichthyomass
LagoonsFloodplainRiverTotal
High water

June-July
85 374 t8 704 t1 786 t95 864 t
Low water

September-October
56 426 t0979 t57 405 t

Table 8.2 Relative abundance by weight of nineteen species of commercial fishes at high water (June-July) and at low water (August-September) on the Kafue Flats in 1970 (after Lagler et al., 1971).

Commercial speciesHigh-water ichthyomass Percentage of totalLow-water ichthyomass Percentage of total
Tilapia andersoni26.6531.72
Tilapia macrochir18.4119.07
Tilapia melanopleura17.435.03
Tilapia sparrmani13.032.09
Serranochromis angusticeps2.982.31
Serranochromis macrocephalus0.300.23
Serranochromis robustus0.230.27
Serranochromis thumbergi0.570.11
Haplochromis carlottae3.160.84
Haplochromis codringtoni0.220.03
Haplochromis giardi0.151.45
Hepsetus odoe3.955.97
Gnathonemus macrolepidotus0.702.19
Mormyrus lacerda0.010.00
Schilbe mystus1.8215.60
Clarias gariepinus5.958.05
Clarias ngamensis3.504.39
Synodontis macrostigma0.390.35
Labeo molybdinus0.550.30

Table 8.3 List of commercial fish species with their vernacular names as used in the Kafue Plains

Scientific nameLozi nameBatwa name
Mormyrus lacerdaNdikusiNamuko
Gnathonemus macrolepidotusNembeleHyansi
Hepsetus odoeMulumeziShimwenge
Labeo cylindricusLinyongaShichidungwe
Schilbe mystusLubangoShilitungu
Clarias gariepinusMbuliSangalala
Clarias ngamensisMbutwameLumbe
Synodontis macrostigmaSingongeSicokocoko
Tilapia macrochirMuMwanga
T. andersoniiNjinjiMpese
T. melanopleuraMbufuMzala
T. sparmaniiSituuMugulalobe
Serranochromis thumbergiMunungu 
S. angusticepsMushunaMulomwe
S. macrosephalaNjengaIndiwamatambo
S. robustusNembwe 
Haplochromis speciesSeoNamawe
 Mbuma 
Alestes lateralis Chitaka

Table 8.4 Summary of data on fish production on the Kafue Flats, 1957–1969 (after Lagler et al., 1971)

YearTonnes
19577 548
195810 250
19594 440
19602 450
19613 940
19625 640
19637 040
19647 980
196510 600
19666 090
19672 890
19684 880
19695 720

Table 8.5 Summary of catch statistics, number of fishermen and boats on the Kafue Flats/Gorge Reservoir Complex

YearTotal catch (t)No. of fishermenNo. of boats
196610 709--
19673 941--
19686 183--
19699 938--
19709 5821 2621 163
19718 247--
19727 874--
19736 2891 0341 021
19745 177--
19757 226--
19769 306--
19779 829--
19788 6342 6331 790
197910 851--
19807 7414 000*2 200*
19819 6194 000*2 200*
19828 9074 000*2 200*

Source: 1966–74: Bazigos et al., 1975
* Estimated by Coopconsult-Propesca, 1982

Table 8.6 Periods of sexual activity of commercial fish species in the Kafue River

SpeciesPeriod
Gnathonemus macrolepidotusDecember to February
Hepsetus odöeDecember to February
Alestes lateralisDecember to March
Labeo cylindricusDecember to April
Schilbe mystusDecember to April
Synodontis macrostigmaDecember to April
Tilapia sparrmaniipeaks in January and May
Serranochromis angusticepsDecember to June

Table 9.1 Summary of availability of data and information on subject matters investigated

Lake
             
Subject             
Inflowing river+++++++++++++
Pre-impoundment study+--------++--+
Yield prediction+--------+--+
hydrology±+++++-++++-+
Morphometry+++++++++++--
Description fishery++±--+-±±±++-+
Annual yield data+---+----±±--
Catch rates+±--+---±----
Fishing effort+---+--------
Mesh selectivity+-----------+
Species composition++--+---+++-+
Small clupeids+---+------+-
Fish biological data+---+---+---+
Management++--+-----+-+
Introduction of species----+-----++-

(++: available and well described;
+: available;
±: scarce data or poor description;
-: not available;)

Figure 1.1

Figure 1.1 Map of Africa indicating countries studied

Figure 2.1

Figure 2.1 Principal reservoirs in Cameroon

Figure 2.2

Figure 2.2 Shape of the Lagdo Reservoir

Figure 2.3

Figure 2.3 Annual variations in water level of Lake Lagdo in the period 1983–1987 (after Zwollo, 1988)

Figure 2.4

Figure 2.4 Evolution of the number of masterfishermen around Lake Lagdo.

Figure 2.5

Figure 2.5 Breakdown of masterfishermen by nationality.

Figure 2.6

Figure 2.6 Quantities of fresh and processed fish marketed at Lagdo in 1989 and 1990 (source:MINEPIA).

Figure 2.7

Figure 2.7 Monthly average catch rates for gillnets at Lake Lagdo in 1990.

Figure 2.8

Figure 2.8 Monthly average catch rates for gillnets operated on motorized canoes around Lake Lagdo in 1990.

Figure 2.9

Figure 2.9 Frequency of nets by mesh size in Lagdo Fishery in 1990.

Figure 2.10

Figure 2.10 Length frequency of Sarotherodon galilaeus from gillnet catches of different mesh sizes.

Figure 2.11

Figure 2.11 Shape of the Maga Reservoir

Figure 3.1

Figure 3.1 Map of Côte d'lvoire showing principal reservoirs

Figure 3.2

Figure 3.2 Shape of Kossou Reservoir

Figure 3.3

Figure 3.3 Average catch rates for different mesh sizes in monifilament gillnets.

Figure 3.4

Figure 3.4 Average catch rates for different mesh sizes in multifilament gillnets.

Figure 3.5

Figure 3.5 Average catch rates for Pellonula afzeliusi in Lake Kossou (May 1973–March 1975).

Figure 3.6
1. HEMICHROMIS FASCIATUS7. LABEO COUBIE
2. HETEROTIS NILOTICUS8. EUTROPIUS MENTALIS
3. HEPSETUS ODOE9. DISTICHODUS ROSTRATUS
4. TILAPIA ZILLII10. CHRYSICHTHYS SPP.
5. TILAPIA GALILAEA11. ALESTES RUTILUS
6. LATES NILOTICUS12. ALESTES NURSE
 13. ALESTES BAREMOZE

Figure 3.6 Species composition of gillnet catches in Lake Kossou (after Roest, 1975)

Figure 4.1

Figure 4.1 Principal reservoirs in Mali

Figure 4.2

Figure 4.2 Shape of the Manantali Reservoir (after Anne et al., in press)

Figure 4.3

Figure 4.3 Sequential filling of Manantali Reservoir (after Anne et al., in press)

Figure 4.4

Figure 4.4 Summary of frame survey results of Manantali reservoir (after Anne et al., in press)

Figure 4.5

Figure 4.5 Differences in species composition of catches from cleared and uncleared lake areas (Anne et al., in press)

Figure 4.6

Figure 4.6 Shape of the Sélingué Reservoir (after Anne et al., in press)

Figure 5.1

Figure 5.1 Principal reservoirs in Sudan

Figure 6.1

Figure 6.1 Principal reservoirs in Tanzania

Figure 6.2

Figure 6.2 Shape of the Mtera lake in the area of the dam

Figure 7.1

Figure 7.1 Principal reservoir in Zaire

Figure 8.1

Figure 8.1 Principal reservoirs in Zambia

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