15 MARCH 1999
ASCORBATE DYNAMICS IN EMBRYOS AND LARVAE OF SEA BASS AND SEA BREAM, ORIGINATING FROM BROODSTOCKS FED SUPPLEMENTS OF ASCORBIC ACID
G. Terova, M. Saroglia, Z.G. Papp, S. Cecchini-1998
Aquaculture International; 6 (5) : 357-367 (Current Contents)
Abstract:
The transfer of L-ascorbic acid (AA) from broodstock to the fertilised eggs and its dynamics in embryos and fasting larvae, has been studied in sea bass (Dicentrarchus labrax L.) and sea bream (Sparus aurata L.). Two types of diets were fed to the broodstocks: one containing sufficient ascorbate for normal growth and the other with an extra addition of a very high dose (2,000 mg/kg feed) of ethyl-cellulose-coated L-ascorbic acid.The concentration of AA and total ascorbate (L-ascorbic acid plus dehydroascorbic acid) was detected through several embryo and larval development stages, including larvae just before feeding. In sea bass and sea bream, the mean (SD) concentration of total ascorbate in fertilised eggs originating from broodstock fed AA supplemented diet, was 218.5 (17.7) and 122.4 (5.1) mu g/g wet weight respectively. This was significantly higher (P < 0.01) than the unsupplemented groups, which contained only 155.9 (6.9) and 103.9 (3.5) mu g/g wet weight respectively. A diet with a vitamin C content adequate for normal growth, may not be sufficient for broodstock when the goal is transfer of TAA to embryos.
(Univ Basilicata, Dipartimento Sci Prod Anim, Via Anzio 10, I-85100 Potenza, Italy, e-mail: saroglia@unibas.it)