Affiliation:
1. Marine Station, University of Plymouth, Artillery Place, Coxside, Plymouth PL4 OLU, UK
2. British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 OET, UK
Abstract
Whole-animal,
in vivo
protein metabolism rates have been reported in temperate and tropical, but not Antarctic fish. Growth in Antarctic species is generally slower than lower latitude species. Protein metabolism data for Antarctic invertebrates show low rates of protein synthesis and unusually high rates of protein degradation. Additionally, in Antarctic fish, increasing evidence suggests a lower frequency of successful folding of nascent proteins and reduced protein stability. This study reports the first whole-animal protein metabolism data for an Antarctic fish. Groups of Antarctic,
Harpagifer antarcticus
, and temperate,
Lipophrys pholis
, fish were acclimatized to a range of overlapping water temperatures and food consumption, whole-animal growth and protein metabolism measured. The rates of protein synthesis and growth in Antarctic, but not temperate fish, were relatively insensitive to temperature and were significantly lower in
H. antarcticus
at 3°C than in
L. pholis
. Protein degradation was independent of temperature in
H. antarcticus
and not significantly different to
L. pholis
at 3°C, while protein synthesis retention efficiency was significantly higher in
L. pholis
than
H. antarcticus
at 3°C. These results suggest Antarctic fish degrade a significantly larger proportion of synthesized protein than temperate fish, with fundamental energetic implications for growth at low temperatures.
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