Wetland & Fish Ecology - Enviro Dynamics Namibia

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46 Table 4-1 Impact Assesment Summary Table ISSUE POTENTIAL IMPACT UNMANAGED MANAGED IMPACT A + B Decrease in EXT DUR INT SIGN Turbidity increase MITIGATION SIGN Disturbance of bottom by soil removal sediment nutrient levels affects fish feeding and breeding negatively L MT MOD - L L Con+ for short construction period only, has little effect on fish life Cover with original surface material L FS1-2 A +B Hardening sides by lining of Decrease in productivity fish L MT MIN -L L/M Ong Fish productivity not affected Create aquatic plant cover by using hollow structures/bricks filled with soil L B Hardening of substrate by lining Okatana channel *Decrease in cover affects fish survival, breeding, feeding *Reduced substrate for aquatic L P SER -M M Ong Normal fish biology Cover lining with original substrate /surface material or allow sediment to collect again naturally and encourage seeding of plants on bottom and along Allow plants to reestablish margins L Plants *Reduced natural self-cleansing Encourage colonisation by plants and benthic filter feeders to Draft Environmental Impact Assessment: Oshakati Flood Mitigation Project Specialist Study: Wetland Ecology and Fish Ecology Imputs July 2012
47 ISSUE POTENTIAL IMPACT UNMANAGED MANAGED IMPACT of water cleanse water Draft Environmental Impact Assessment: Oshakati Flood Mitigation Project Specialist Study: Wetland Ecology and Fish Ecology Imputs July 2012
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PROPOSED FLOOD MITIGATION MEASURES
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ii EXECUTIVE SUMMARY The Cuvelai Ri
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iv Decreased surface area of iishan
Page 7 and 8: vi CONTENTS EXECUTIVE SUMMARY .....
Page 9 and 10: viii 4.9 IMPACTS OF REMOVAL OF VEGE
Page 11 and 12: x Figure 4-7 Raised floor of bridge
Page 13 and 14: 1 1 INTRODUCTION 1.1 BACKGROUND: Th
Page 15 and 16: 3 were also still present although
Page 17 and 18: 5 2 LEGAL AND REGULATORY REQUIREMEN
Page 19 and 20: 7 3.1.1 CUVELAI WETLAND SYSTEM: The
Page 21 and 22: 9 Figure 3-1 below is a map of the
Page 23 and 24: 11 In the 1950s and 1960s, a progra
Page 25 and 26: 13 Recommendations to the Departmen
Page 27 and 28: 15 invertebrate fauna by Nakanwe, (
Page 29 and 30: 17 possibly via the Calueque-Oshaka
Page 31 and 32: 19 harvesting fish along the Ondang
Page 33 and 34: 21 from survivors from the last flo
Page 35 and 36: 23 As this underlines the importanc
Page 37 and 38: 25 Discussion with Mr L. Hango, Hyd
Page 39 and 40: 27 A full record of the discussion
Page 41 and 42: 29 Oreochromis macrochir Greenhead
Page 43 and 44: 31 26 June 2012 Site 5 DIKE 10 Oshi
Page 45 and 46: 33 Oshanas at end of canal, Dec 198
Page 47 and 48: 35 Fish species Common names Iishan
Page 49 and 50: 37 Fish species Common names Iishan
Page 51 and 52: 39 The following sizes of fish were
Page 53 and 54: 41 4 IMPACT ASSESMENT (OF THE DIKE
Page 55 and 56: 43 Channing and Griffin (1993) and
Page 57: 45 A) Impact related to dike and it
Page 61 and 62: 49 blooms as has happened in Gorean
Page 63 and 64: 51 A) Impact related to dike and it
Page 65 and 66: 53 ISSUE POTENTIAL IMPACT UNMANAGED
Page 67 and 68: 55 4.4 IMPACTS OF ALTERED FLOWS (VE
Page 69 and 70: 57 Figure 4-3 Inakulo Yomadhiya Gra
Page 71 and 72: 59 High fishing pressure can be exp
Page 77 and 78: 65 During low floods, especially af
Page 81 and 82: 69 Okatana channel of marginal vege
Page 83 and 84: 71 4.6 IMPACTS ON FROGS (PARTICULAR
Page 87 and 88: 75 4.7.2 IMPACT OF DEEPENING AND LI
Page 91 and 92: 79 4.8 IMPACTS OF FLOODGATE OPERATI
Page 95 and 96: 83 4.9 IMPACTS OF REMOVAL OF VEGETA
Page 97 and 98: 85 Although only one study on the e
Page 101 and 102: 89 4.10 IMPACTS OF DEEPENING THE CH
Page 105 and 106: 93 4.11 HEALTH IMPACTS/SPREAD OF BI
Page 107 and 108: 95 POTENTIAL IMPACT UNMANAGED MANAG
Page 109 and 110:
97 4.12 COMMENT ON POTENTIAL FOR FI
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99 This includes following the natu
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101 5 CONCLUSIONS AND RECOMMENDATIO
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103 6 REFERENCES Berry, H.H. (1972)
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105 Geiss, W. (1971). A preliminary
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107 Van der Waal, B.C.W. (2000a). F
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109 Mr Shakelia responded that the
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111 his earlier studies to see whic
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113 Amaranthaceae Nymphaeceae Vahli
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115 Poaceae Poaceae Poaceae Poaceae
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117 Cypercaeae Cypercaeae Cypercaea
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119 Class: Branchiopoda Order: Anos
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121 Sars 1909 Macrothrix spinosa 18
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123 7 1 0 Osprey Pandion haliactus
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125 APPENDIX 3: Field Notes FIELD N
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127 Do not foresee any impacts of w
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129 B) FISH SURVEY RESULTS - ACTUAL
Page 143 and 144:
131 Site 4 Dike 3 Tuesday 25 June T
Page 145 and 146:
133 Site 7 Thursday 28 June - Deep
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Wetland & Fish Ecology - Enviro Dynamics Namibia

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