Browsing by Author "Hunt, Arzu Ozluer"

Now showing 1 - 2 of 2

Effect of Dietary Supplementation of Inulin on Growth Performance, Digestion Enzyme Activities and Antioxidant Status of Rainbow Trout (Oncorhynchus Mykiss)
(2019) Yıldırım, Metin; Çetinkaya, Mükerrem; Hunt, Arzu Ozluer; Yılmaz, Ferbal Özkan; Berkoz, Mehmet; Yalın, Serap
The present study investigated the effects of the prebiotic inulin on the growth parameters, digestiveenzyme activities and antioxidant status of rainbow trout (Oncorhynchus mykiss). After acclimation,fish (34±0.22 g; n = 135) were assigned into 9 tanks (15 fish per tank) and triplicate groups were feda control diet (G-0) or diets containing 1% (G-1) or 2% (G-2) inulin. At the end of the trial (8 weeks),growth factors (final weight, weight gain, specific growth rate (SGR), food conversion ratio (FCR),protein efficiency ratio (PER), Economic conversion ratio (ECR), digestive enzyme activities(pepsin, trypsin, amylase and lipase) and antioxidant status superoxide dismutase (SOD), catalase(CAT) and malondialdehyde (MDA) level of liver tissue were assessed. At the end of the studyhighest survival rate was observed in the fish fed with 1% G-1 inulin group. Similarly, digestiveenzyme activities were significantly higher dietary G-1 group. Subsequently, elevated growthperformance (final weight, SGR and FCR) was observed in trout fed with 1% compared to thecontrol group. The effect of the dietary inulin on digestion was partly observed by assaying theactivity of pepsin, intestinal amylase, trypsin and lipase. Apart from pepsin activity, results indicated that dietary supplementation of inulin is beneficial and may also have differential effects upon digestive enzyme activities. Antioxidant enzyme activity of SOD and CAT in liver tissue was generally higher in the supplemented inulin diets than in the control and significantly higher in the 1% inulin group. A significant decrease in MDA level of tissue was observed in all inulin supplemented groups when compared to the control group. These results indicate that inulin be considered as a beneficial dietary supplement for growth performance, digestive enzyme activities and antioxidant status of rainbow trout.
The Effects of Fish Meal Replacement by Yeast Based Nucleotides on Growth, Body Composition and Digestive Enzyme Activity in Rainbow Trout Juveniles (Onchorchyncus Mykiss)
(Israeli Journal of Aquaculture-bamidgeh, 2014) Hunt, Arzu Ozluer; Yilmaz, Ferbal Ozkan; Engin, Kenan; Berkoz, Mehmet; Gunduz, Suna Gul; Yalin, Serap; Sahin, Nefise Ozlen
This 60 day study investigated the effects of organically certified nucleotide yeast-derived protein source (Nu-Pro (R)) on growth, feed efficiency, fillet proximate composition and digestive enzymes in rainbow trout (Onchorhyncus mykiss). Diets were isonitrogenous and isocaloric. Three experimental diets wherein 20%, 40% and 60% of the fish meal content was replaced by Nu-Pro (R), were compared to the control diet in which the crude protein content was anchovy fish meal and corn gluten meal. The rainbow trout (initial weight 27 g/fish) were fed twice daily in 200-l Aqaria. Live weight gain increase ranged from 125-195% in fish fed the experimental diets. Results indicated that up to 40% fish meal protein can be replaced by Nu-Pro (R) without compromising growth rates, feed efficiency or the fillet biochemical composition in the rainbow trout. The effect of the dietary Nu-Pro (R) supplementation on digestion was partly observed by assaying the activity of pepsin, intestinal amylase, trypsin and lipase. Apart from amylase activity, results indicated that dietary supplementation of nucleotides is beneficial and may also have differential effects upon digestive enzyme activities.