Bioenergetics of juvenile whitespotted bamboo shark Chiloscyllium plagiosum [Anonymous (Bennett)]

This study establishes the bioenergetics budget of juvenile whitespotted bamboo shark Chiloscyllium plagiosum by estimating the standard metabolic rate (R-S), measuring the effect of body size and temperature on the R-S, and identifying the specific dynamic action (R-SDA) magnitude and duration of that action in juvenile whitespotted bamboo sharks. The mean +/- S.D. (R-S) of six fish (500 - 620 g) measured in a circular closed respirometry system was 30.21 +/- 5.68 mg O-2 kg(-1) h(-1) at 18 degrees C and 70.38 +/- 14.81 mg O-2 kg(-1) h(-1) at 28 degrees C, respectively. There were no significant differences in R-S between day and night at either 18 or 28 degrees C (t-test, P > 0.05). The mean +/- S. D. Q(10) for 18 - 28 degrees C was 2.32 +/- 0.06 (n = 6). The amount of oxygen consumed per hour M-O2 changed predictably with body mass (M; 295-750 g) following the relationship: M-O2 0.28M(0.83) (n = 40, r(2) 0.92, P < 0.05). The mean magnitude of RSDA was 95.28 +/- 17.55 mg O-2 kg(-1) h(-1). The amount of gross ingested energy (E-I) expended as R-SDA ranged from 6.32 to 12.78% with a mean +/- S. D. of 8.01 +/- 0.03%. The duration of the R-SDA effect was 122 h. The energy content of juvenile whitespotted bamboo shark, squid and faeces determined by bomb calorimeter were 19.51, 20.3 and 18.62 kJ g dry mass(-1). A mean bioenergetic budget for juvenile whitespotted bamboo sharks fed with squid at 18 degrees C was 100C = 29.5G + 31.9R(S) + 28.2R(SDA) + 6.7F + 2.1E + 1.6U, where C consumption, G growth, F = egestion, E = excretion and U = unaccounted energy. (c) 2008 The Authors Journal compilation (c) 2008 The Fisheries Society of the British Isles.