Function and metabolism
A6 and A5-desaturase, particularly in liver. However, this activity was
limited by the large amount of long-chain (n-3) PUFAs which contained
was known to inhibit Δ6-desaturase (Léger et al., 1981). The high proportion of these fatty acids in maize oil diet was supplied by fish meal.
Table 1 - Effects of diet and transfer in sea water on phospholipid composition from various tissues
of trout (% of total phospholipid).
Diet
Water
Effects
Diet
Water
Effects
MO
FO
FW SW Diet Water
MO
FO
FW sw Diet Water
Light muscle
Liver
CL
2,2
2,2
2,1
2,2
NS
NS
CL
2,7
2,9
2,8
2,8
NS
NS
PE
21.2
20,8 22,2
19,9
NS
**
PE
19,8
20,2
19,8
20,2
NS
NS
PI
3.7
3,9
3,1
4,4
NS
*
PI
1,1
5,5
5,1
4,9
**
NS
PS
0,1
0,2
0,2
0,2
NS
NS
PS
2,0
2,0
1,8
1,9
NS
NS
PC
72,2
72,0 71,7
72,4
NS
NS
PC
68,9
66,7
67,9
67,7
NS
NS
SPM
0,6
0,9
0,7
0,9
**
*
SPM
2,6
2,7
2,6
2,0
NS
NS
Gills
Intestine
CL
2,9
3,0
3,4
2, t
NS
**
CL
2,8
2,7
3,2
2,3
NS
*
PE
22,3
21,5
21,2
22,6
NS
NS
PE
26,1
26,6
26,2
26,5
NS
NS
PI
2,7
2.3
2,5
2,5
*
NS
PI
5,6
4,9
5,0
5,5
**
*
PS
4,1
3,8
3,7
1,2
NS
**
PS
1,1
3,6
3,5
4,3
**
***
PC
67,0
68,1
68,0
67,0
NS
NS
PC
56,9
56,9
57,2
56,6
NS
NS
SPM
1,1
1,3
1,2
1,3
NS
NS
SPM
1,5
5,3
5,0
4,9
***
NS
MO: maize oil, FO: fish oil, FW: freshwater, SW: sea water, CL: cardiolipin, PE: phosphatidyl ethanolamine,
Pl: phosphatidyl inositol, PS: phosphatidyl serine, PC: phosphatidyl choline, SPM: sphingomyelin.
Each value is the mean for 6 animals. NS: no significant, * p<0.05, **p<0.0l, ***p<0.001.
Table 2 - Effects of diet and transfer in sea water on fatty acid composition of triglycerides
(% of methyl esters present).
Diet
Water
Effects
Diet
Water
Effects
MO FO
FW SW Diet Water
MO FO
FW SW Diet Water
Light muscle
Liver
Saturated
22,3 23,7
22,3 23,8
***
***
Saturated 20,0 20,9
18,9 21,9 NS
**
MUFA
35,5
44,8
41,0 39,3
***
**
MUFA
40,2 17,1
47,6 39,9 *** ***
(n-6) PUFA 26,1
6,1
15,8 16,2
***
NS
(n-6) PUFA 22,2
4,4
11,9 1 4,7
***
***
(n-3) PUFA 10,1 25,4
20,9 20,7 ***
NS
(n-3) PUFA 17,6 27,0 21,6 23,5 ***
NS
Gills
Intestine
Saturated
24,1 25,2
25,1 24,2
NS
NS
Saturated 23,0 24,4
25,1 22,4
*
**
MUFA
34,3
40.7
38,1 37,0
***
*
MUFA
36,7 43,3
40,1 39,8
***
NS
(n-6) PUFA 20,3
4,8
11,7 13.3 ***
**
(n-6) PUFA 22,9
5,5
13,8 14,5
***
*
(n-3) PUFA 21,3 29,3
25,1 25,5
***
NS
(n-3) PUFA 17,4 20,8 21,0 23,3 *** ***
MO: maize oil, FO: fish oil. FW: freshwater, SW: sea water.
Each value is the mean for 6 animals. NS: no significant, * p<0.05, **p<0.01, ***p<0.001.
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