Journal
AQUACULTURE RESEARCH
Volume 45, Issue 4, Pages 591-601Publisher
WILEY
DOI: 10.1111/j.1365-2109.2012.03257.x
Keywords
feed utilization; Fish protein hydrolysate; resistance to bacterial infection; growth; Persian sturgeon larvae; digestive enzymes
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Funding
- Tarbiat Modares University (Tehran, Iran)
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The effect of fish protein hydrolysate (FPH) on the growth, feed utilization, digestive enzymes, gut microflora and resistance to bacterial challenge in Persian sturgeon (Acipenser persicus) larvae during a 45-day feeding trial has been investigated. Artificial diets containing different levels of tuna visceral protein hydrolysate (PH0, PH10, PH25 and PH50) and live foods (Artemia: 5days, Daphnia: 40days) were fed to Persian sturgeon larvae. Larvae fed on the PH10 and PH25 had growth, feed utilization, protein content and trypsin activity significantly better than PH0 and PH50 groups (P<0.05). Condition factors, survival rate and pepsin activity were not significantly different (P>0.05). Brush border membrane enzymes to cytosolic enzyme ratio revealed that maturation had been occurred in 41days post hatch (dph) at moderate FPH levels. In 54 dph larvae, this ratio was not affected by the level of FPH in the diet. No significant differences were observed in the total number of gut microflora or in the resistance to Aeromonas hydrophila (P>0.05), whereas lactic acid bacteria was significantly higher in PH50 (P<0.05). The results of this study show that application of moderate levels of FPH in Persian sturgeon diets could enhance larvae performance due to the early maturation in intestinal.
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