FI:SF/NIR 24
Technical Report 3
NIGERIA
PELAGIC PRIMARY PRODUCTION IN KAINJI LAKE
based on the work ofPELAGIC PRIMARY PRODUCTION IN KAINJI LAKE
S. G. Karlman
| KAINJI LAKE RESEARCH PROJECT FI:SF/NIR 24 Technical Report 3 NIGERIA based on the work ofPELAGIC PRIMARY PRODUCTION IN KAINJI LAKE S. G. Karlman |
UNITED NATIONS DEVELOPMENT PROGRAMME
FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome, 1973
Report prepared for
the Government of Nigeria
by
the Food and Agriculture Organization of the United Nations
acting as executing agency for
the United Nations Development Programme
FAO. Kainji Lake Research
Project. Nigeria. Pelagic primary production in Kainji Lake, based on the work
of 3. G. Karlman.
Rome, 1973. 59 pages, 23 figures,
FI:SF/nir 24, Technical Report 3.
ABSTRACT
As part of the Kainji Lake Research Project being carried out by the Government of Nigeria with the assistance of the United Nations Development Programme and the Food and Agriculture Organization of the United Nations, the pelagic primary production in the lake was studied from December 1970 to September 1972. Production per volume of water and per unit surface area was estimated using the oxygen light and dark bottle technique. Seasonal variations in solar radiation transparency, temperature and composition of subsurface light were also measured. The average production was found to be 822 mg C/m2/d. The transparency and the nutrient content of the water are the main factors limiting photosynthetic production. The phytoplankton production in Kainji Lake has been compared with production in other tropical waters and an attempt has been made to relate the pelagic primary production to fish production. The results indicate an order of magnitude of fish catch for Kainji Lake of 15 kg/ha/a, assuming that 20% of the total production of fish is harvestable. This estimate, while of no higher accuracy than other estimates that have been given, is the lowest so far proposed.
The Food and Agriculture Organization is greatly indebted to the following organizations and individuals who assisted in the implementation of the project by providing information, advice and facilities:
The Government of Finland
The National Advisory Committee for the Kainji Lake Research Project
The Director, Federal Fisheries Service
The hydrologist and officials of the National Electricity and Power Authority
The Fishery Officers of the Ministries of Agriculture and Natural Resources, Kwara and Northwestern State
The Sole Administrator, New Bussa
The Emir of Borgu.
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2.2 Measurements and Calculations
3.1 Estimation of Daily Production
3.2 Production per Surface Area, ΣP
3.3 Production per Unit Volume of Water, P Max
3.6 Utilisation of Solar Radiation
3.7 Replenishment Rate of Lake Water
3.9 Spectrum of Subsurface Light
3.10 Calculation of Production
3.11 Turnover Bate of Plankton Biomass
3.12 Vertical Distribution of Phytoplankton
4.1 Primary Production in Tropical Lakes
4.2 Comparison of Kainji with Other Tropical Lakes
4.3 Factors Affecting Production
Chapter 5 CONCLUSIONS AND RECOMMENDATIONS