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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 3 | PAGES 287-301 | 1997
© Oxford University Press

research-article

Diet-shifts and food-dependent survival in Engraulicypris sardella (Cyprinidae) larvae from Lake Malawi, Africa

A.B. Thompson1 and Kenneth Irvine2

UK/SADC Pelagic Fish Resource Assessment Project Box 311, Salima, Malawi 1Present address: c/o Directorate of Fisheries Research, Fisheries Laboratory Lowestoft, Suffolk NR33 OHT, UK 2Present address: Department of Zoology, University of Dublin, Trinity College Dublin 2, Ireland

Received on April 2, 1996; accepted on September 30, 1996 The diet of Engraulicypris sardella (Cyprinidae) larvae was deterinmed from the open waters of Lake Malawi, Africa. The guts of first-feeding larvae of 2–3 mm total length (TL) usually contained many cells of 5–9 µm diameter tentatively identified as a non-colonial green alga (Chlorophyta). The number of these cells in the guts of larvae declined as larvae increased in size, and were not found in larvae greater than 9 mm TL. Other types of phytoplankton were rarely seen in the guts of larvae. Copepod nauplii were eaten by larvae greater than 4 mm TL, and copepodite copepods and cladoceans by larvae greater than 5 mm TL. The biomass of open water crustacean zooplankton and E.sardella larvae were determined over a 2-year sampling programme. The mortality rate of E. sardella was negatively correlated with zooplankton biomass, but was not significantly correlated with the amount of zooplankton food in the guts of larvae.


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