Browsing by Author "Gultepe N."

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Comparative study of haematological parameters of three sturgeon species in recirculating aquaculture system
(2017-01-01) Gultepe N.; Sazykina M.; Sazykin I.; Sonmez A.Y.; Khmelectsova L.E.; Khammami M.I.
The aim of this study was to evaluate and compare the haematological parameters of cultured Russian sturgeon (Acipenser gueldenstaedtii), stellate sturgeon (Acipenser stellatus) and Siberian sturgeon (Acipenser baerii) in recirculating aquaculture system. Total erythrocytes, thrombocytes, red blood cell distribution, monocytes, basophils as well as haemoglobin levels of stellate sturgeon differed significantly from that of the other two species (p<0.05). Leukocyte and lymphocyte levels of Siberian sturgeon were significantly higher than in stellate sturgeon and Russian sturgeon (p<0.05). Eosinophil percentages of Siberian sturgeon were significantly lower than stellate sturgeon and Russian sturgeon (p<0.05). Haematocrit levels of stellate sturgeon differed from Siberian sturgeon (p<0.05), but no differences between Siberian and Russian sturgeons were found. Neutrophil, mean cellular haemoglobin and mean cellular volume and mean cellular haemoglobin concentration levels did not differ significantly between the three sturgeon species (p>0.05). The information generated may help in monitoring health status and to adopt better management strategies in culture systems.
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.
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.