Evaluation of l-ascorbyl-2-glucose
as the source of vitamin C for juvenile Korean rockfish Sebastes
schlegeli (Hilgendorf)
X. Wang, K.-W. Kim, G.-J. Park, S.-M. Choi, H.k. Jun, S.C. Bai-2003
Aquaculture
Research, 34(14):
1337-1342
Abstract:
This study was conducted to compare l-ascorbyl-2-glucose
(AA2G) with l-ascorbyl-2-monophosphate-Na/Ca
(AMP-Na/Ca) for supplying the dietary vitamin C for juvenile Korean rockfish
Sebastes schlegeli (Hilgendorf). Fish were fed one of seven
semi-purified diets containing equivalents of 0, 50, 100 and 200 mg
ascorbic acid (AA) kg-1 diet in the form of AA2G or
AMP-Na/Ca for 12 weeks. After 12 weeks of feeding, weight gain, feed
efficiency ratio and survival of fish fed the vitamin C-free diet were
significantly lower than those of fish fed the vitamin C-supplemented diets
in either form. The hepatosomatic index, condition factor and survival of
fish fed AMP-Na/Ca100, AMP-Na/Ca200, AA2G100
and AA2G200 diets were significantly higher than fish fed the
vitamin C-free diet. After 9 weeks of feeding, fish fed the vitamin C-free
diet began to show vitamin C deficiency signs such as anorexia and lethargy.
At the end of the 12-week feeding trial, fish fed the vitamin C-free diet
exhibited vitamin C deficiency signs, e.g., anorexia, scoliosis,
exophthalmia and fin haemorrhage. Vitamin C retention in the muscle and
liver was similar to those of fish fed AA2G- or AMP-Na/Ca-supplemented
diets. In general, there was no significant difference in the muscle and
liver vitamin C concentration in fish fed the AA2G and AMP-Na/Ca diets at
the same supplementation levels.
(Department of Aquaculture Feeds &
Foods Nutrition Research Center, College of Fisheries Science, Pukyong
National University, 599-1 Daeyeon-3-dong, Nam-gu, Pusan 608-737, Republic
of Korea, E-mail of S.C. Bai: scbai@mail.pknu.ac.kr)