Oxygen consumption in Caridina nilotica (Decapoda: Atyidae) in relation to temperature and size

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Abstract
SUMMARY. The oxygen consumption of shrimps ranging from 1 to 30 mg dry mass was determined at 18, 24 and 30°C using a continuous flow recording respirometer based upon a Clark‐type oxygen electrode. Respiration (ascribed to routine metabolism) is described by the power curve: R = a Mb, (R=μg O2 h−1, M= mg dry mass), which gives values of a= 1.632, 2.564 and 4.181, and b= 0.800, 0.898, and 0.793, at 18, 24 and 30°C respectively. The single expression, R= 0.008 T1.829M0.830 provides a reasonable prediction of respiration as a combined function of shrimp size (M) and temperature (T, °C). Using an energy equivalent of 14.14 J mg O2−1 estimates of the energy requirements (E, J h−1 10−3) of routine metabolism are given by the expression: E= 0.115 T1.829M0.830.Variability in oxygen consumption values between individuals is discussed and the observations on C. nilotica are compared with other crustacean studies.