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The filtration rate of Perna perna (L.) at the approximate annual mean local water temperature (20 "C) is high, being 2.7 X I O ~ (shell length in mm)'-86 1 h-' or 8.85 (dry flesh weight in 1 h-'. It was found to be able to filter latex particles down to at least 0.46 pm in diameter, these being roughly the mean size of free coccoid bacteria in the study area. Its mean assimilation efficiency, determined by the Conover method, was 61 % on a natural diet of particles < 100 pm in diameter which had a mean organic content of 3.16 mg 1 ' . The faeces production rate was also established and an energy budget for P. perna is discussed in the light of available data.

The brown mussel Perna perna on the Natal coast, South Africa: utilization of available food and energy budget