Diurnal Variations in Serum Levels of Various Constituents in Cultured Yellow-Tail (Seriola quinqueradiata)

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The diurnal variations in the serum levels of 13 chemical constituents were studied at interval of four hours, from 6: 00 AM to next 2: 00 AM, in yellow-tail (Seriola quinqueradiata).One group of yellow-tail was reared with raw fish and another with compound diet as food.The fish were not fed on the day of experiment and 3 fish for each group were sacrificed at each time. The diurnal variations in the fish fed on raw fish were various in pattern with different constituents.For most of the constituents, the serum levels were higher in daytime and lower in night.The time of a day at blood sampling should be strictly chosen for determining more accurately constituents of the serum levels. The diurnal variations in the fish fed on the compound diet were generally different and indistinct in pattern with those in the fish fed on raw fish.The significance of the differences in the diurnal variation between both groups were discussed to ameliorate the compound diet.
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