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We discuss the energetics of a cladoceran, Simocephalus vetulus at different temperatures (8.0 ± 1.0, 15.0 + 1.0, 21.0 + 1.0 and 28.0 + 1.0 C) and food (Chlamydomonas sp.) concentrations (25 X 103, 50 X 103, 75 X 103 and 100 X 103 cells ml -). Increase in temperature accelerated ingestion and, to some extent, oxygen consumption. The study revealed a high reproduction efficiency in S. vetulus. Net growth efficiency (ECI) was higher (13.17 41.18%) in pre-adults than in adults (2.71-8.40%). The assimilated energy (A) increased with increasing food concentration at all temperatures. Assimilation efficiency (AD) decreased with increasing food concentrations. The energy used for growth (P) was nearly constant at all food levels because the egested energy increased and assimilation efficiency decreased as food concentration increased.

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