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Table 2.

Activities of enzymes of intermediary metabolism in rectal gland and white muscle from the blue-spotted ribbontail stingray (Taeniura lymma) and rectal gland and red muscle from the brownbanded bamboo shark (Chiloscyllium punctatum)

T. lymma
C. punctatum
Rectal glandWhite muscleRectal glandRed muscle
CCO 25.2±2.5LKHM 1.10±0.30 (5)KR 40.4±5.5*,LK 41.2±7.1LK 
CPT 0.30±0.03LKHM ND 0.49±0.10HM ND 
COT 0.053±0.012LK,† ND 0.63±0.14*,HM 0.044±0.013LKR 
HOAD 1.43±0.05LM 0.24±0.03LKR 1.73±0.12*,LKHM 0.90±0.14LR 
d-β-HBDH 4.95±0.34KHM 0.32±0.05LHR 2.04±0.46*,H 1.36±0.08 
PK 97.9±5.2LKM 522±17LKHR 61.1±5.9*,LKM 221.1±22.3LKHR 
GDH 3.53±0.30K 1.32±0.18K 4.60±0.31*,LK 5.41±0.34LK 
T. lymma
C. punctatum
Rectal glandWhite muscleRectal glandRed muscle
CCO 25.2±2.5LKHM 1.10±0.30 (5)KR 40.4±5.5*,LK 41.2±7.1LK 
CPT 0.30±0.03LKHM ND 0.49±0.10HM ND 
COT 0.053±0.012LK,† ND 0.63±0.14*,HM 0.044±0.013LKR 
HOAD 1.43±0.05LM 0.24±0.03LKR 1.73±0.12*,LKHM 0.90±0.14LR 
d-β-HBDH 4.95±0.34KHM 0.32±0.05LHR 2.04±0.46*,H 1.36±0.08 
PK 97.9±5.2LKM 522±17LKHR 61.1±5.9*,LKM 221.1±22.3LKHR 
GDH 3.53±0.30K 1.32±0.18K 4.60±0.31*,LK 5.41±0.34LK 

Activities were measured at 25°C. ND=not detectable. See List of abbreviations for enzyme names.

Activities are expressed as μmol min-1 g-1 wet mass (mean ± s.e.m., N=6 for T. lymma except where noted in parentheses; N=4 for C. punctatum); *enzyme activity in rectal gland from C. punctatum is significantly different from the activity of the same enzyme in rectal gland from T. lymma(Student's t-test, P<0.05); uppercase letters in superscript indicate significant difference (one-way ANOVA, P<0.05) from the same enzyme activity within species in: Lliver, Kkidney, Hheart, Rrectal gland, Mskeletal muscle (T. lymma) or red muscle (C. punctatum) (data other than for rectal gland, white muscle and red muscle are in Table 1); COT activity is significantly different from CPT activity within the same tissue (Student's t-test, P<0.05). ND activities were omitted from statistical tests.

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