Present study examined the effects of Ergosan on growth performance, digestive enzyme activities, hematological parameters and gastrointestinal structure of rainbow trout. Rainbow trout (mean weight 100-110 g) were fed basal diet (control) and diet treated with Aquavac Ergosan (5 g kg⁻¹ of diet) for 50 days. Results of this study showed that Ergosan supplementation significantly increased weight gain (94.27 g vs. 65.04 g), specific growth rate (4.09 vs. 3.10) and feed intake (136.85 g vs. 111.22 g) and decreased feed conversion ratio (1.43 vs. 2.03) compared to control (P<0.05). Lipase activity and leukocyte and erythrocyte count also increased in juvenile fish fed Ergosan-treated diet compared to control (P<0.05). Light microscopy demonstrated that both groups of fish displayed normal morphology of proximal intestine and pyloric caeca. In Ergosan-treated group, higher percentage of goblet cell was shown in proximal intestine and pyloric caeca. Present study suggests that Ergosan effectively promotes growth performance, lipase activity and gastrointestinal structure in rainbow trout.
This study examined the effects of Hilyses TM , fermented Saccharomyces cerevisiae (S. cerevisiae), on rainbow trout growth performance, haematological parameters, digestive enzyme activities and gastrointestinal structure. Rainbow trout (mean weight 100-110 g) were fed dietary Hilyses TM (5 g kg À1 ) and control diet without Hilyses TM for 50 days. Results of this study demonstrated that yeast supplementation in treatment group resulted in increased feed intake, followed by improved feed conversion ratio (FCR) and growth performance. Significant increases were also observed in trypsin and amylase activities in juvenile fish fed treatment diet. Light microscopy demonstrated that both groups of fish displayed normal morphology of proximal intestine and pyloric caeca. In yeasttreated group, higher density of the goblet cells per villus in the proximal intestine was shown. No effects on haematological parameters and carcass chemical composition were noted. It is therefore possible to use fermented S. cerevisiae supplementation to significantly improve the gastrointestinal structure and growth performance in rainbow trout.
This study investigated the effects of dietary Aloe vera on growth performance, some histological alterations in rainbow trout skin and gastrointestinal tract and disease resistance against Streptococcus agalactiae (S. agalactiae). Four treatments were designed including a control and Aloe vera incorporated in the fish feed at 0.01%, 0.1% and 1%, which were administrated for a period of six weeks. Results showed that Aloe vera at 0.1% and 1% administration resulted in improved specific growth rate (SGR) and feed conversion ratio (FCR). The Aloe vera-treated groups, improvement in proximal intestine, pyloric caeca and skin epidermis histology were also noted. The mortality rate after challenge with S. agalactiae was significantly low in fish fed 0.1% and 1% Aloe vera. The present study suggests that Aloe vera especially at 0.1% and 1% feed administration may enhance effectively the growth performance, gastrointestinal and skin morphology and resistance against S. agalactiae in rainbow trout
This study was conducted to evaluate the efficiency of Ergosan, an algal extract containing alginic acid and Hilyses, a fermented Saccharomyces cerevisiae, on growth, immune response and hematological parameters in rainbow trout (Oncorhynchus mykiss). Fish with an initial average weight of 70-75 g were fed with Ergosan (5 g kg-1) and Hilyses (10 g kg-1) for a period of 70 days. The Results revealed that dietary supplementation of Ergosan and Hilyses enhanced the growth of all treated fish significantly compared to fish fed with non-supplemented diet. Dietary intake of Ergosan significantly increased the red blood cell, white blood cell and neutrophil levels compared to the Hilyses-fed and control groups. The highest IL-8 level and lysozyme activity were recorded in the Hilyses-fed fish followed by Ergosan. Serum total protein content was enhanced in fishes administrated with Ergosan compared to the control group. The findings of this study suggested the potential of Ergosan and Hilyses to activate growth performance and immunological parameters in rainbow trout.
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