Table 1.

Maximal activity of metabolic enzymes from pectoral adductor muscle of Antarctic fishes

N. coriicepsG. gibberifronsC. aceratusC. rastrospinosus
COND28.38±2.06A14.82±0.96B14.53±1.28B
CS25.83±1.28B21.02±1.50A15.38±0.56C18.13±1.24C
HK00.20±0.04A0.28±0.03A0.37±0.03B
PFK1.06±0.06A1.48±0.10*1.45±0.04B0.91±0.06A
LDH29.87±1.08B14.07±0.52A32.73±1.66B25.27±1.99C
PK17.43±0.38B14.42±0.75A13.04±1.03A9.85±1.36C
CPT-I84.52±2.23B107.00±5.55A55.42±2.56C74.41±5.11B
HOAD2.51±0.11A,B2.28±0.07A,C2.03±0.07C2.70±0.17B
  • CO, cytochrome oxidase; CS, citrate synthase; HK, hexokinase; PFK, phosphofructokinase; LDH, lactate dehydrogenase; PK, pyruvate kinase; CPT-I, carnitine palmitoyltransferase I; HOAD,β -hydroxyacyl-CoA-dehydrogenase.

    Enzyme activities are expressed as μmol product formed min-1 g-1 wet mass (U), except for CPT-I (mU).

    Values are means ± S.E.M.

    Letters designate significant differences among species (P<0.05). ND, not determined.

  • * Crockett and Sidell (1990).