FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome, 1973

TABLE OF CONTENTS

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TABLE OF CONTENTS

ABBREVIATIONS

SUMMARY

1.   INTRODUCTION

1.1   Terms of Reference

1.2   The Limnological Programme

1.3   Previous Investigations

2.   METHODS EMPLOYED

2.1   Survey Cruises

2.1.1   Measurement of Water Temperature

2.1.2   Water Chemistry

2.1.3   Plankton Sampling

2.1.4   Other Routine Observations

2.2   Light Penetration Studies

3.   PHYSICAL CHARACTERISTICS OF KAINJI AREA

3.1   The Regional Setting

3.2   Climate of the Region

4.   RESULTS OF STUDY (Physical Characteristics of Kainji Lake)

4.1   Morphology

4.2   Hydrology

4.3   Thermal Conditions

4.4   Light and Turbidity

4.5   Chemical Composition of Kainji Water

4.6   Summary of Physical Characteristics of the Lake .

5.   RESULTS OF STUDY (Biological Characteristic)

5.1   Ecological Communities of Kainji Lake

5.2   Primary Production

5.3   Ultrasonic Scattering Layer

5.4   Summary of Biological Characteristics

6.   FISHERY DEVELOPMENT

6.1   Potential Yield of Fishes

6.1.1   Trophodynamic Estimates

6.1.2   Estimate of Catch from Morphoedaphic Index

6.1.3   Limitations of the above Estimates

6.2   Distribution of Fishes and Fishing Effort

6.3   Depth-distribution of Fishes

6.4   Migration and Spawning of Fishes

6.5   Seasonal Variation in Growth Rate of Fishes

6.6   Underwater Visibility

6.7   Aquacultural Development and Enrichment of the Lake

6.8   Summary

7.   RECOMMENDATIONS FOR FUTURE WORK

7.1   Recommended Changes in Present Programme of Limnological Research

7.1.1   Programme of Physical Research

7.1.2   Cooperative Programmes in Physical Research

7.1.3   Programme of Biological Research

7.1.4   Meteorological and Climatic Studies

7.2   Hew Studies

7.3   Summary of Recommendations

Appendix 1.   REFERENCES

LIST OF TABLES

  1.   Summary of survey cruises (limnological programme)

  2.   Hypsographic chart for Kainji Lake

  3.   Analytical Heat budget for Kainji Lake (1970)

LIST OF MAPS/FIGURES

  1.   Kainji dams

  2.   Control chart for bathythermograph callibration

  3.   Approximate latitudinal position of the Intertropical Front (ITF)

  4.   Average rain per month near Kainji Lake

  5.   Inflow and Outflow at Kainji (1967–70)

  6.   Maximum and minimum air temperature by month

  7.   Relative humidity by month

  8.   Radiation climate at Kainji

  9.   Radiation balance calculated for Kainji region

10.   Wind run (monthly average) Yelwa Station

11.   Hypsometric chart for Kainji Lake

12.   Mean temperature of the water column at Station 1

13.   Components of the heat budget

14.   Thermal structure of Kainji Lake

15.   Seasonal change in water transparency

16.   Chemical composition of Kainji water by major ions

17.   Titration curve for Kainji Lake water