A Note on the Limnology of Lake Hayq,1 Ethiopia

Baxter, R.M.; Golobitsh, D.L.

Limnology and Oceanography 15(1): 144-149


ISSN/ISBN: 0024-3590
DOI: 10.4319/lo.1970.15.1.0144
Accession: 068500724

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Lake Hayq is an Ethiopian highland lake with an area of 23 km2 and a maximum depth of well over 80 m. Its water has a conductivity (k20) of about 800 µmho/cm; the total ionic concentration is 10 meq/liter. The predominant cation is magnesium, followed by sodium, calcium, and potassium in that order; predominant anions are carbonate and bicarbonate, followed by chloride. The p H of the water is about 9. There was some stratification of silica and phosphate at the time of sampling. The lake is a fairly typical African Class Ii lake, but it differs from other Ethiopian lakes of this class in the remarkable transparency of its water (vertical extinction coefficient for green light about 0.17/m), its very low density of plankton, and the depth of the oxygenated layer (about 40 m).