The Cichlid Fishes of Lake Malawi, Africa

Abstract of Publication

Robinson, R.L., G.F. Turner, A.S. Grimm, and T.J. Pitcher. 1995. An experimental study of phytoplankton feeding in 3 tilapiine cichlids. Journal of Fish Biology 46 (3): 449-456.  

Three species of tilapia (Oreochromis lidole, O. karongae and O. niloticus) were fed on four planktonic algal diets in the laboratory. The algal concentrations were measured over a 24-h period and the ingestion rates calculated. In monocultures of large algae (average filament length=477 Ám) O. niloticus had the highest ingestion rate, but on small algae (particle size <8 Ám) O. lidole was the fastest, while O. karongae enhanced nanoplankton production. With algae of mixed sizes, O. niloticus was able to remove small algae quicker than the other fish species. Thus, the presence of larger algae can influence the impact of a planktivorous species on nanoplankton. O. lidole is likely to have the greatest impact on plankton communities heavily dominated by smaller algae.




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