Browsing by Author "Acar U."

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Does dietary incorporation level of pea protein isolate influence the digestive system morphology in rainbow trout (Oncorhynchus mykiss)?
(2021-11-01) Demirci B.; Terzi F.; Kesbic O.S.; Acar U.; Yilmaz S.; Kesbic F.I.
In the present study, fish meal (FM) was replaced by pea (Pisum sativum) protein (PP) in diet for Rainbow trout (Oncorhynchus mykiss) at levels of 0% (PP0), 25% (PP25), 50% (PP50), 75% (PP75) and 100% (PP100), and the effect of dietary PP level on the digestive system tracts and liver was investigated by micromorphological and histopathological evaluations. Morphometric measurements (mm 100g fish−1) of the liver width and stomach length in rainbow trout were found to be significantly larger (p <0.05) in fish with high-level pea protein as the main protein source (PP75, PP100) compared to the low-level PP replacement group (PP25). No significant differences were found in morphometric measurements for pyloric caecum and intestines among treatment groups, whereas the number of the caecum of fish fed the PP25 diets significantly increased over the control (PP0) (p<0.05). In the histological examination of the liver, mild hydropic and vacuolar degeneration was observed in all experimental groups except PP0 and PP25. The measurements of pyloric caecum fold height, enterocyte length and width of tunica muscularis of the high-level pea protein groups of PP75 and PP100 were significantly higher (p <0.05) compared to the control group. In conclusion, 25% substitution of PP can be suggested for FM in trout diets, because the findings of the present study provided evidence that the digestive system improved by increasing the number of pyloric caecum at this replacement level.
Effect of dietary protein level on growth performance and nitrogen excretion of the juvenile convict cichlid, Amatitlania nigrofasciata
(2014-01-01) Gultepe N.; Acar U.; Kesbic O.; Gokkus K.; Aydin S.
A 8 weeks growth trial was conducted to determine the effects of dietary protein on the growth of the convict cichlid Amatitlania nigrofasciata and on water quality in closed recirculating systems. Four test diets were formulated to contain protein levels ranging 30-45%. The fish averaging 0.47±0.07 g were reared in 10 L aquarium. Fish were fed ad libitum at 08:30, 12:30 and 16:30 for 8 weeks. A second-order polynomial regression between dietary protein levels and weight gain in each group, demonstrated that the most suitable protein level for maximum growth was determined to be 40.8%. The feed conversion ratios of fish ranged from 1.78-2.78 in the experimental groups. Results showed significant differences in SGR and WG. Dietary protein level significantly influenced ammonia excretion, fish fed 45% protein excreted higher concentrations of ammonia-nitrogen than fish fed 30-40% dietary protein. For optimum growth, feed conversion and ammonia excretion, a diet containing 40.8% protein, 12% lipid and 20.8 kJ gross energy/kg diet is recommended for juvenile convict cichlids, A. nigrofasciata. © Medwell Journals, 2014.
Effects of dietary tribulus terrestris extract supplementation on growth, feed utilization, hematological, immunological, and biochemical variables of nile tilapia Oreochromis niloticus
(2014-01-01) Gültepe N.; Acar U.; Sabri Kesbiç O.; Yilmaz S.; Yildirim O.; Türker A.
The present study was conducted for 88 days to evaluate the effect of dietary Tribulus terrestris supplementation on growth performance, feed utilization, and hematological, immunological, and biochemical indices of Nile tilapia, Oreochromis niloticus. A total of 144 Nile tilapia, average body weight 2.61±0.35 g, were divided into four experimental treatments. There were three replicates of each treatment. Four isonitrogenous (40% CP) and isolipidic (10% CL) experimental diets contained T. terrestris extract at levels of 0, 200, 400 and 600 mg/kg respectively. Growth performance and feed utilization of Nile tilapia were significantly higher (p<0.05) in all treatment groups fed with T.terrestris extract supplemented diets than those fed the control diet. There were no significant differences between body composition of fish (p>0.05). Hematocrit, hemoglobin, mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), and myeloperoxidase variables were not significantly affected by herb extract (p>0.05). However, mean corpuscular volume (MCV) value and lysozyme activity increased with increasing T. terrestris extract (p<0.05). Serum albumin, total protein, and triglyceride levels were not affected by T. terrestris extract. Serum globulin and glucose levels increased and cholesterol levels decreased in Nile tilapia fed with herbal supplemented diets. The results of the present study suggest that Nile tilapia fed diets containing at least 400 mg/kg T. terrestris extract enhanced growth performance, feed utilization, hematological, immunological, and biochemical indices.
Effects of replacing fish meal with peanut meal (Arachis hypogaea) on growth, feed utilization and body composition of mozambique tilapia fries (Oreochromis mossambicus)
(2014-01-01) Yildirim O.; Acar U.; Türker A.; Sunar M.; Kesbiç O.
The study was to determine the effects of diets replacing fish meal (FM) with peanut meal (PNM) on feed utilization, growth performance and body composition of Mozambique tilapia (Oreochromis mossambicus, initial body weight 0.83±0.17 g). Five isonitrogenous (37% CP) and isolipidic (9% CL) experimental diets with 0% (PNM- 0), 10% (PNM-10), 20% (PNM-20), 30% (PNM-30) and 40% (PNM-40) of fish meal replaced with PNM. At the end of a 45 day feeding trial, PNM-10 and PNM-20 diets showed the best growth performance and feed evaluation. Higher dietary FM replacement negatively affected growth performance and feed evaluation. Our results at the end of the experiment showed that the replacement of FM by PNM in Mozambique tilapia diets does not affect body composition. In conclusion, these results indicate that the replacement of 20% dietary FM with PNM had no adverse effect on the growth performance, body composition parameters and general health of Mozambique tilapia fries (mean weight 0.8-3 g). Copyright 2014 Zoological Society of Pakistan.
Evaluation of dietary protein and lipid requirements of two-banded seabream (Diplodus vulgaris) cultured in a recirculating aquaculture system
(2014-01-01) Bulut M.; Yiğit M.; Ergün S.; Kesbiç O.; Acar U.; Gültepe N.; Karga M.; Yılmaz S.; Güroy D.
The objective of this study is to investigate the effects of dietary protein and lipid levels on the growth performance and bioeconomic benefits of two-banded seabream (Diplodus vulgaris) juveniles, a candidate species for aquaculture sector. Eight experimental diets were formulated with four protein (50, 45, 40 and 35 %) levels for each of the two lipid levels (15 and 10 %). Triplicate groups of juvenile fish with an average initial body weight of ~3.64 g were reared in a recirculating aquaculture system and hand fed twice a day until satiation for a period of 60 days. In the experiment, no difference in survival rate was found between the different groups. Relative growth rate (RGR), specific growth rate (SGR), feed conversion ratio (FCR) and daily feed intake were not significantly affected by increasing protein and/or lipid treatments in this present study. However, the RGR, SGR and FCR values showed slightly better efficiency in the experimental group (35/15) fed with lower protein content (35 %) and higher lipid level (15 %) compared with those fed other diets. According to bioeconomic analyses results, the diet with the 35 % protein and 15 % lipid generated the best profit. The results suggest that two-banded seabream can be accepted as a promising alternative species for the aquaculture industry and optimum growth of two-banded seabream fingerlings can be obtained when they are fed a diet containing 35 % crude protein and 15 % crude lipid. © 2013 Springer Science+Business Media Dordrecht.
Evaluation of the effects of essential oil extracted from sweet orange peel (Citrus sinensis) on growth rate of tilapia (Oreochromis mossambicus) and possible disease resistance against Streptococcus iniae
(2015-02-01) Acar U.; Kesbiç O.S.; Yilmaz S.; Gültepe N.; Türker A.
The study was performed to determine the effect of dietary essential oil (citrus EO) extracted from sweet orange peel (Citrus sinensis) on growth performance, blood parameters and resistance against the Streptococcus iniae in Mozambique tilapia (Oreochromis mossambicus). Fish were divided into 4 groups and fed for 90. days with four experimental diets (3 supplemented diets with 0.1%, 0.3%, and 0.5% of citrus EO and a control group). Then the main immune parameters such as lysozyme and myeloperoxidase activity, hematological and biochemical variables (i.e., hemoglobin, hematocrit levels, erythrocyte indices, serum total protein, glucose, albumin, globulin, cholesterol and triglyceride) were investigated. Results of this study showed that for tilapia fed with citrus EO all parameters were significantly higher than the control group. Moreover, addition of citrus EO into diets reduced fish mortality after S. iniae infection. It can be concluded that citrus EO can act as a growth promoter, increase immunity and also improve disease resistance to S. iniae infection in tilapia. Thus it can be used as an antibiotics replacer for controlling diseases in tilapia feed.
Gibel carp (Carassius auratus gibelio) meal as an alternative major protein in feeds for rainbow trout juveniles (oncorhynchus mykiss)
(2019-01-01) Acar U.; Kesbic O.S.; Yilmaz S.; Kesbic F.I.; Gultepe N.
In this study, the effects of gibel carp meal (GFM) application as a protein source on growth performance, fillet composition, feed digestion and haematological and serum biochemical indices of rainbow trout (Oncorhynchus mykiss) were evaluated. Replacement of anchovy fish meal (AFM) with GFM was performed at 0%, 50% and 100% levels (GFM0, GFM50 and GFM100). After 60 days of feeding the best nutritional performance was obtained in the GFM100 group. There was no significant difference in crude moisture, crude protein, crude lipid or crude ash contents in fish fillet between the GFM0, GFM50 and GFM100 groups. No side effects were observed in hematological and serum biochemical indices of rainbow trout. Dry matter, crude protein and crude lipid digestibility coefficients did not differ significantly in experimental groups. As a conclusion, the results of the study suggested that the GFM could be used totally as a replacer of AFM in diets for rainbow trout without the adverse effects on growth performance, feed use, feed digestion, hematological and serum biochemical parameters of fish.