Lake Turkana limnologlcal study 1985-1988.
1988
Kallqvist, T. | Lien, L. | Liti, D.
The lake level was declining during the study and reached the lowest level ever recorded in 1988. The salt content was increasing and conductivity reached ca.380 mS/m in 1988. Annual temperature variations were small but sufficient to create thermal stratification in March-May. Low deep water oxygen concentration was observed during stratification, especially in 1988. The development of phytoplankton was limited by the availability of nitrate and light. Light limitation was caused by turbid water and vertical mixing. The gross phytoplankton primary production was 2.4-8.2 g O<sub>2</sub>/m<sup>2</sup>/day and the estimated total annual production ca. 2<sub>2</sub>kg O<sub>2</sub>/m<sup>2</sup>. The total zooplankton production was estimated to approx. 32-80g dry weight/m<sup>2</sup>. Based on these production estimates, the sustainable yield of traditionally exploited fish from the open lake was estimated to roughly 15000-30000 tons/year.
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