Effects of Dietary Stearic Acid and Protein Levels on the Utilization of Stearic Acid by Freshwater Prawn Macro brachium rosenbergii Juveniles

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  • Effects of Dietary Stearic Acid and Protein Levels on the Utilization of Stearic Acid by Freshwater Prawn <i>Macrobrachium rosenbergii</i> Juveniles
  • Effects of Dietary Stearic Acid and Pro

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The effects of dietary stearic acid (SA) and crude protein (CP) levels on the utilization of SA as an energy source by freshwater prawn Macrobrachium rosenbergii (de Man) were determined by feeding and tracer experiments.<br> Feeding experiments showed that M. rosenbergii juveniles fed diet 2 (2% SA+35% CP) gave significantly higher (p<0.05) weight gain, feed conversion efficiency (FCE), and protein efficiency ratio (PER) than those fed diet 4 (7% SA+50% CP), which provided the lowest weight gain, FCE, and PER. Diet 2 tended to give higher weight gain than diets 1 (0% SA+35% CP) and 3 (7% SA+35% CP), but no significant difference existed among the 3 dietary groups. The higher weight gain of prawns fed diet 2 (2% SA) compared with diet 1 (0% SA) indicated the positive contribution of SA as an energy source. Significantly higher SA and oleic acid levels were observed in prawns fed diets with 7% SA than those fed with 2% SA, indicating that dietary SA affected body fatty acid profile. Prawns fed diets containing 35% CP had significantly higher PER than those fed 50% CP diets.<br> Tracer experiments showed that M. rosenbergii juveniles utilized SA as an energy source as evidenced by expired 14CO2 after feeding with [14C] SA. Expired 14CO2 accounted for half of ingested radioactivity 48 h after feeding with labelled diets. The prawns fed diets containing 35% CP expired much more 14CO2 than those fed diet containing 50% CP, but no significant difference was detected (p>0.05).

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