Some serum constituents levels were examined before and after a single feeding in yellow-tail (Seriola quinqueradiata) fed on raw fish or a compound diet.
In the group fed on raw fish, total protein, its fractions II and III, urea-N, total cholesterol, magnesium and phosphate-P levels returned to the pre-feeding values at 14 hrs, with the peaks at 6 to 10 hrs after feeding. The orange color index expressed in the arbitrary unit and triglyceride levels returned to the pre-feeding values at 18 hrs, via prominent and prolonged elevations with peaks at 6 hrs after feeding. Transitory declines at 1 hr after feeding were observed in the serum levels of total protein, total cholesterol, magnesium and phosphate-P.
In the group fed on the compound diet, the absence of orange color, more prompt increases in triglyceride and NEFA, and decreases in calcium and phosphate-P levels were observed after feeding.
The causes of these variations and the post-feeding time for blood sampling were discussed.
