Evaluation of blood glucose concentration, hepatosomatic index, and liver histology of golden rabbitfish Siganus guttatus at different levels of fermented Gracilaria verrucosa dietary

Abstract

Abstract The study aimed to evaluate the effect of fermented Gracilaria verrucosa dietary on blood glucose level, hepatosomatic index, and liver histology of golden rabbitfish Siganus guttatus . The inclusion level of fermented G. verrucosa on rabbitfish diet was investigated namely: 0% (G0), 20% (G20), 25% (G25), and 30% (G30). The feeding experiment was conducted in eight weeks with three replicates for each treatment. Juvenile golden rabbitfish were stocking in a fiber tank with 15 fish/100 L density. The concentration of blood glucose, hepatosomatic index, and liver histology of golden rabbitfish was investigated. The hepatosomatic index data was analysed statistically using analysis of variance (ANOVA), and the blood glucose concentration and liver histology data were analysed descriptively. Fermented G. verrucosa resulted an increasing of blood glucose levels of rabbitfish. The blood glucose levels in control increased within 6 hours after feeding, reaching an average of 48±15 mg/dL, G20 showed an increasing of blood glucose level within 3 hours after feeding (71±6.56 mg/dL), meanwhile G25 and G30 exhibited an increasing in blood glucose levels within 6 hours after feeding, measuring 68.67±34.08 mg/dL and 48.33±17.39 mg/dL, respectively. The varying level of G. verrucosa inclusion did not have a significant impact on the hepatosomatic index (P>0.05), which ranged from 0.99% to 1.13% among all treatments. The liver histology analysis revealed there was no serious problem on liver tissue. The present study demonstrates that fermented G. verrucosa can be effectively used as an energy source without causing any adverse effects on rabbitfish’s liver.

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