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.
The level of the heavy metal in green tiger shrimp (Penaeus semisulcatus) and crab (Portunus pelagicus) caught off the Persian Gulf near Bushehr province were investigated. This study was performed to evaluate instrumental neutron activation analysis (INAA) to analyze heavy metal concentration in crab and shrimp whole body tissue. The order of the swimmer crab and shrimp heavy metal concentrations were Zn>Fe>As>Mn>Co and Fe>Zn>Mn>As>Co, respectively. The results showed swimmer crab (Portunus pelagicus) and shrimp (Penaeus semisulcatus) caught off Persian gulf, were contaminated with high level of As (21.38±3.31ppm and 8.28±2.82 ppm, respectively). High levels of As and Mn were noted in crabs and shrimp, respectively.
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.
Abstract. Ergosan contains 1% alginic acid extracted from two brown sea weeds. Little is known about the target organs and anatomical distribution of Ergosan (alginic acid) in fi sh. Therefore, feasibility of developing alginic acid nanoparticles to detect target organ in rainbow trout is interesting. To make nanoparticles, Ergosan extract (alginic acid) was irradiated at 30 kGy in a cobalt-60 irradiator and characterized by transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). Results from TEM images showed that particle sizes of irradiated alginic acid ranged from 30 to 70 nm. The FTIR results indicated that gamma irradiation had no signifi cant infl uence on the basic structure of alginic acid. Later, alginic acid nanoparticles were successively labelled with 67 Ga-gallium chloride. The biodistribution of irradiated Ergosan in normal rainbow trout showed highest uptake in intestine and kidney and then in liver and kidney at 4-and 24-h post injection, respectively. Single-photon emission computed tomography (SPECT) images also demonstrated target specifi c binding of the tracer at 4-and 24-h post injection. In conclusion, the feed supplemented with alginic acid nanoparticles enhanced SPECT images of gastrointestinal morphology and immunity system in normal 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
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