Abstract
1. A drop in ambient temperature from 18 to 6°C results in a drop by a factor of 4 in the incorporation in vivo of (32P) phosphate and (1-14C) acetate into lipids in trout intestine, kidney and liver, independent of environmental salinity, when the two precursors are added to the water in the incubation tank.
2. In sea-water a similar mean temperature factor of 5 applies to the incorporation into gill tissue lipids in trout as well as in eels (Anguilla anguilla).
3. However, in fresh water a factor of 5 applies only to the incorporation into eel and trout gill lipids of (1-14C) acetate but not of (32P) phosphate; the latter precursor is subject to a drop in incorporation by as much a factor as 60 as the ambient temperature goes down from 19 to 6°C.
4. The relative incorporation (% of total phospholipid) into phosphatidylethanolamine of (32P) phosphate and (1-14C) acetate shows a positive linear correlation with the ratio
of the corresponding total incorporations into eel and trout gill lipids.
5. The 14C-labelled trout fatty acids tend to be less unsaturated at 6 than at 18°C in all tissues, apart from gill tissue in sea-water, where they seem unchanged.
2. In sea-water a similar mean temperature factor of 5 applies to the incorporation into gill tissue lipids in trout as well as in eels (Anguilla anguilla).
3. However, in fresh water a factor of 5 applies only to the incorporation into eel and trout gill lipids of (1-14C) acetate but not of (32P) phosphate; the latter precursor is subject to a drop in incorporation by as much a factor as 60 as the ambient temperature goes down from 19 to 6°C.
4. The relative incorporation (% of total phospholipid) into phosphatidylethanolamine of (32P) phosphate and (1-14C) acetate shows a positive linear correlation with the ratio
of the corresponding total incorporations into eel and trout gill lipids.
5. The 14C-labelled trout fatty acids tend to be less unsaturated at 6 than at 18°C in all tissues, apart from gill tissue in sea-water, where they seem unchanged.
Original language | English |
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Journal | Comparative Biochemistry and Physiology - B Biochemistry and Molecular Biology |
Volume | 103 |
Issue number | 1 |
Pages (from-to) | 81-87 |
ISSN | 1096-4959 |
DOIs | |
Publication status | Published - 1992 |