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7. REFERENCES

Balarin, J.D. 1985 National Reviews for Aquaculture in Africa. 7. Kenya. FAO Fish. Circ. (770.7): 96 pp.

Bell, F.W. and E.R. Canterbery 1976 Aquaculture for Developing countries: A Feasibility Study. Cambridge Ballinger Publ. Co., 266 pp. (not seen, but cited by Balarin)

Bhushan, K. 1983 Kenya 82–83 Yearbook, Newspread International, Nairobi. 216 pp.

Dale, I.R. 1939 The Woody Vegetation of the Coast Province of Kenya. Imp. For. Inst. Paper 18: 1–22

Kenya Ports Authority 1986 Tide Tables for East African Ports, 1986

Kenya Soil Survey 1982 Exploratory Soil Map and Agro-Climatic Zone Map of Kenya. Exploratory Soil Survey Report No. El

Kenya Soil Survey 1983 Surface Geology and Soil Map (prepared by Japan International Cooperation Agency), 1st ed.

Kokwaro, J.O. 1984 The Distribution and Economic Importance of the Kenyan mangroves. In: Endangered Resources for Development, Proceedings of a Workshop on the Status and Options for Management of Plant Communities in Kenya, March 1984

Michieka, D.O., B.J.A. van der Pouw and J.J. Vleeshouwer 1978 Soils of the Kwale-Mombasa-Lunga-lunga area. Reconnaissance Soil Survey Report No. R3, Kenya Soil Survey

Nicolic, M. and Y.A. Tang 1976 Proposed Model of a Coastal Fish Farming Pilot Production Project for Kenya. Indian Ocean Fishery Survey and Development Programme INT/71/034. FAO, Rome

Padlan, P.G. 1982 Report on Consultancy, Kenya Brackishwater Aquaculture Project, ADCP/Circ./82, FAO, Rome

Sivalingam, S. 1981 Basic approach to mariculture: problems and development strategies. In: Proceedings KMERI Workshop on Aquatic Resources of Kenya, July 13–19, Mombasa

Wokabi, S.M., W.G. Sombroek and J.P. Mbuvi 1973 A preliminary evaluation of the irrigation suitability of the lands in the pre-delta Tana floodplain (Marembo-Garsen). Site Evaluation Report No. 15, Kenya Soil Survey

Wokabi, S.M. 1976 Preliminary evaluation of the soil conditions of the Tana delta for irrigation development. Site Evaluation Report No. P23, Kenya Soil Survey

Table 1
Length of Kenya's coastline broken down by District, as estimated from Survey of Kenya topographic maps
(Scale 1:50 000; Series Y731)

DistrictLength of coastline (km)
Lamu  650
Tana River  120
Kilifi   265
Mombasa*  175
Kwale   210
Total length1 420

* Includes coastline of entire Port Reitz portion of which lies within Kwale District

Table 2
Inventory of tidal swamps and tidal flats in Kenya, as estimated from survey of Kenya topographic maps
(Scale 1:50 000; Series Y731)

DistrictArea (ha)Percent
Lamu28 400 56
Tana River  3 000   6
Kilifi  6 400 13
Mombasa*  3 100   6
Kwale  9 100 19
Total Area50 400100

* Includes the whole of Port Reitz portion of which lies within Kwale District

Table 3
Summary of field observations, Lamu District, Kenya, 10–15 March 1986

LocationNo. of StationsElevation
(m)
General Description
Kimbo42.2 – 2.6Rhizophora. Topsoil siltloam, subsoil generally peaty. Clay materials may be found in some spots. Thick forest.
Mkunumbi42.8 – 3.2Vast, clear tidal flats, after narrow Rhizophora/Avicennia band. Topsoil, sand; subsoil sand to peaty-sand. Avicennia sparse around fringes.
Hidio62.8 – 3.2(Same as Mkunumbi)
Ungu51.9 – 2.6Areas with lower elevation covered by Rhizophora, others clear tidal flats. Topsoil from silty loam (Rhizophora area) to sandy (clear flat); subsoil peaty.
Kipungani41.2 – 1.4Thick Rhizophora cover. Topsoil, silty sand to sand; subsoil peaty sand.
Manda Is.40.9 – 2.9Thick Rhizophora. Topsoil very loose sand and silt. Subsoil very peaty.
Bora Imani13.2Clear tidal flat. Same as Mkunumbi.
Magogoni13.5Clear flat behind sand dune. Topsoil light brown sand. Subsoil with mottles of gray clay and organic matter but still sandy.
Wange Creek21.8 – 3.3Low areas with thick Rhizophora. High areas, clear sand flats. Substrate sand to peaty sand.
Dodori Creek--(Survey party unable to land at tidal flats due to shallow waters at low tide). Creek bed of soft silty-and sand material. Viewed, from distance through breaks in narrow Rhizophora zone, clear areas behind with characteristic appearance of sand flats fringed by Avicennia typical to all other areas examined).
Pate Is.20.9 – 1.2North coast; topsoil silty sand, subsoil peaty; West coast frontal by 1.25 km of shallow reef flat, exposed in parts, mangrove areas dominated by Rhizophora substrate sandy to peaty.
Rasini11.6         Thick Rhizophora. Substrate very thin layer of sand over peat material with very little sand, consisting of live roots.
Uvondo21.38–3.2Low area, Rhizophora forest. High area, clear with sparse Avecennia. Substrate, sand to peaty sand.
Kwakate11.56      Sparse Rhizophora behind sand dune. Substrate sand to peaty sand.
Tukutu21.8.2.95Low area, thick Rhizophora with soft silty mud substrate. High area characteristic sand flat with peaty subsoil.
Mokowe23.5.4.0  Vast clear tidal flats with sparse Avicennia patches at edges. Topsoil, sand. Subsoil same mottled with dark organic matter, peaty close to vegetation.

Table 4
Result of Field Survey and Soil Analysis, Tana River area, Kenya

   S O I L*
StationNature of AreaElevation (m)TypepH
1Mangrove near river mouth2.10Silty-loam(no sample taken)
2Mangrove3.3clay7.64
3Mangrove3.10clay6.98
4Mangrove3.0clay6.86
5Mangrove3.8sandy clay6.55
6Seasonal swamp4.0–4.3sandy clay6.10

* Soil determined through manipulative tests on moistened, previously dried and powdered samples. Soil pH taken from dried and powdered fresh samples.

Table 5
List of saltworks operating or scheduled to operate within the Ngomeni to Kurawa area and their corresponding hectarage

 Name of CompanyArea occupied (ha)
 Tana saltworks a   380
 Kurawa saltworks   800
 (Name unknown) b1 300
 Kristalline1 200
 Malindi Saltworks   664
 Kensalt Saltworks2 264
 Fundisa Saltworks1 018
 Ngomeni Saltworks   296
Total7 922

a abandoned but proposed for rehabilitation
b area already surveyed and claimed

Table 6
Result of Field Survey and Soil Analysis, Ngomeni to Kurawa area, Kenya

   SOIL*
LocationNature of areaElevation (m)TypepH
Ngomenia) Clear 2.87Sandy loam7.46
 b) Mangrove 2.76Clay loam 
 c) Mangrove 3.00Sandy clay loam7.25
FundisaOpen flat 3.50–4.0Sandy clay loam7.17
Kensalta) Open flat, topsoil 3.50–4.0Silt loam7.86
 subsoil         clay loam6.95
 b) Mangrove, topsoil 2.80Silty clay loam7.43
 subsoil         Clay loam7.25
Kurawaa) Mangrove 2.50Sandy clay loam6.93
 b) Open flat 3.50–4.0Clay loam6.04
KristallOpen flat 3.50–4.0Sandy clay6.80
Tana saltworksOpen flat 3.0 – 4.0Sandy clay loam6.96

* Separate topsoil and subsoil samples taken only where marked stratification is observed, other all samples taken within the 5–30 cm layer. Type determined through manipulative tests on moistened, previously dried and powdered samples. Soil pH taken from dried and powdered, fresh samples.

Table 7
Result of Field Survey and Soil Analysis, Port Reitz and Port Tudor, Mombasa, Kenya

   SOIL*
StationNature of AreaElevation (m)TypepH
Port Reitz1. Clear Area 3.93Sandy clay loam5.67
 2. Mangrove (topsoil) 2.25Silty clay loam6.97
 (subsoil)        Loam6.78
 3. Mangrove 3.32Silty clay loam7.43
Port Tudor1. Mangrove 1.75–1.85(silty-loam to peaty, n.s.) 
 2. Mangrove 1.85Loam6.80
 3. Mangrove 1.85Sandy loam6.97
 4. Mangrove 1.85(soft, silty mud, n.s.)
 5. Mangrove 1.85Loam6.93

* Separate topsoil and subsoil samples taken only where marked stratification was observed, otherwise all samples taken within the 5–30 cm layer. Type determined through manipulative tests on moistened, previously dried and powdered samples. Soil pH taken from dried and powdered, fresh samples.

n.s. = no sample taken

Table 8
Summary of field observations, Kwale District, Kenya (not including Port Tudor), 5–7 March 1986.

LocationNo. of StationsElevation (m)General Description
Bodo32.0–3.2Low area with Rhizophora. Top soil sand. Subsoil mottled with clay. High areas, clear flat with some Avicennia. Topsoil sand. Subsoil peaty sand.
Bodo saltfarm13.8Abandoned, approx 5 ha. Developed from clear flat. Bottom of ponds and topsoil: sand. Subsoil. clay at 5 cm. Area outside pond: sand with mottles of clay.
Munge13.0Clear area; sand to peaty-sand. Rhizophora forest: sand with little clay.
Shimoni11.86Rhizophora-/Avicennia. Peaty-loam 30 cm deep over coraline bed.
Kisiwani12.7Rhizophora/Avicennia. Peaty-loam from surface to 50 cm.
Marjorine13.1Clear tidal flat behind Rhizophora: peaty sand from surface to 35 cm, greyish clay sand below.
Jimboni12.2Rhizophora stand behind white sand beach. Topsoil, loam sand up to 25 cm. Subsoil, dark peaty loam.
Vanga32.0–3.0Clay-loam to peaty loam in Rhizophora stand, stand to peaty sand in clear flats.
Gazi1-Avicennia stand. topsoil sand Subsoil peaty sand.

Table 9
Summary of Findings: Survey of the Coastal Areas of Kenya for Shrimp Farm Development

DistrictType of areaElevation(m)SoilPotential for Development
LamuMangrove0.9–2.0Sand/peatpoor
 tidal flat2.8–3.5sand/peatpoor
TanaMangrove3.0–4.0clay/sandygood
Kilifi 1Mangrove2.5–3.8sandy-clay loam/silty-clay-loamoccupied
 tidal flat3.5–4.0sandy-loam/clay loamoccupied
Mombasa 2Mangrove1.8–3-2silty-clay/clay loamfair
 tidal flat3.9–4.0sandy/sandy loampoor
Kwale 3Mangrove1.8–2.8sand/peatpoor
 tidal flat3.5–4.0samd/peatpoor

1 Ngomeni to Kurawa only; Mida Creek, Kilifi creek not usable. Most areas already occupied by saltworks but potential for integrating shrimp culture with present operation every good. Conversion to semi-intensive or intensive shrimp farm also possible.

2 Includes the whole of Port Reitz.

3 Shimoni-Vanga and Gazi Bay only.

Table 10
Inventory of first reservoirs of various saltworks which could be stocked with P. monodon on an extensive basis

Name of CompanyArea of reservoir (ha)
Tana Saltworks    60*
Kurawa saltworks  80
(Unknown Company)130
Kristalline    86*
Malindi    75*
Kensalt226
Fundisa102
Ngomeni  30
Total789

* Actual area in operation or proposed for development, all others estimated as 10 per cent of total area covered.

Table 11
Inventory of Potential Shrimp Culture Areas in Kenya

LocationExtensiveIntensiveTotal (ha)
Tana River North Bank    0 1000  1000
Bellazoni Estate    0   500    500
Ngomeni to Kurawa   
Salt Works Reservoir   (800) a      800
Peripheral Mangrove    0    1000 b   1000
Port Reitz150   150     300
Port Tudor350       0     350
 500  2650   3150
  (1300) c       (3950) c

a Refer to first reservoirs of existing and proposed salt farm, See Appendix III for details.

b Mangroves outside perimeter of developed or to be developed area but maybe within saltwork companys's concession. A small portion below 2.8 m elevation may be suitable or marginally suitable for extensive system.

c total including saltworks reservoir.

Figure 1

Figure 1. The coastal area of Kenya showing boundaries of administrative districts.

Figure 2

Figure 2. Location of sampling stations at the northern portion of the Kenya coastline from Kilifi Creek to Lamu; Site Survey Mission, Project KEN/80/018.

Figure 3

Figure 3. Location of sampling stations at the southern portion of the Kenya coastline from Mombasa to Vanga; Site Survey Mission, Project KEN/80/018.

Figure 4

Figure 4. Schematic representation of a typical tidal swamp and flat in the coastal area of Kenya.

Figure 5

Figure 5. Horizontal salinity distribution, surface and one-meter layer; Tana River, Kenya; 21 March, 1986, 1300 to 1350 hours. (Low: 1.33 m at 0802 hrs. High: 2.09 m at 1408 hrs.)

Figure 6

Figure 6. Vertical salinity profiles at three different sections of Tana River, Kenya; 21 March, 1986, 1300 to 1350 hours. (Low: 1.33 m at 0802 hrs. High: 2.09 m at 1408 hrs.)

Figure 7

Figure 7. Site of abandoned Tana Saltworks at Mto Kilifi area, Tana River District, being proposed for an integrated saltworks and shrimp farm project.

Figure 8

Figure 8. Map of Kurawa to Ngomeni area, Kilifi District, Kenya, showing location of saltworks.(1 of 3)

Figure 8

Figure 8. Map of Kurawa to Ngomeni area, Kilifi District, Kenya, showing location of saltworks.(2 of 3)

Figure 8

Figure 8. Map of Kurawa to Ngomeni area, Kilifi District, Kenya, showing location of saltworks.(3 of 3)

Figure 9

Figure 9. Diagrammatic presentation of the optimal elevation ranges for various shrimp culture systems based upon tidal characteristics of Kenyan waters.

Figure 10

Figure 10. Typical soil profiles at various sites along the coastal area of Kenya.

Figure 11

Figure 11. Tidal swamps within Mombasa showing sites with potential for shrimp farm development.

Figure 12

Figure 12. Tidal swamp area along the Tana River bank showing site deemed suitable for semi-intensive or intensive culture of Penaeus monodon.

Figure 13

Figure 13. The abandoned Bellazoni estate along the old Tana River showing portion which could be developed for shrimp farming.

Figure 14

Figure 14. Sites found ideal for shrimp hatchery development and extent of coastline from Kilifi to Malind where other potential sites may be found.


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