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    The Effects of 17 ?-Estradiol on Growth, Survival and Feminization of Green Tiger Shrimp, P. semisulcatus (Decapoda: Penaeidae)
    (Medwell Online, 2011) Aktas, Mevlut; Genc, M. Ayce
    The effects of 17 beta-estradiol were investigated on survival, feminization and growth of green tiger shrimp, Penaeus semisulcatus in different life stages. Egg, nauplius, protozoea, mysis and postlarvae were immersed in water containing 50 mu L-1 17 beta-estradiol from the beginning of the each stage to the end of the stage. The grow out were carried out about 4 months to emerging the secondary sexual characters in ventral side of shrimp in this ponds. The results of the experiment showed that the method of immersion 50 mu g L-1 17 beta-estradiol in eggs, nauplius, protozoea stages decreases the survival rate. The best feminization rate (71.88%) were observed in naupli group and this result was important statistically than control and other groups (p<0.001). Respect of the growth rate, the highest mean weight was 14.15+/-2.41 g in nauplii group and this followed by control (13.66+/-2.48 g) and egg groups (12.04+/-0.68 g) and were significantly different from the other groups (p<0.05).
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    Effects of dietary mannan oligosaccharides (MOS) on growth, body composition, and intestine and liver histology of the hybrid Tilapia (Oreochromis niloticus x O-aureus)
    (Israeli Journal Of Aquaculture-Bamidgeh, 2007) Genc, M. Ayce; Yilmaz, Erdal; Genc, Ercument; Aktas, Mevlut
    This is the first study on the effects of dietary mannan oligosaccharides (MOS) on growth, body composition, and intestine and liver histology of hybrid tilapia (Oreochromis niloticus x O. aureus). Experimental diets were prepared from commercial trout diet, supplemented with MOS at levels of 0, 1.5, 3.0, or 4.5 g MOS/kg feed and randomly assigned to triplicate groups. At the end of the trial, there were no significant differences between treatment groups (p>0.05) in growth parameters (live weight gain, specific growth rate, feed conversion ratio, protein efficiency ratio) or body indices (hepatosomatic and viscerosomatic). Dry matter and protein contents increased with increasing rates of dietary MOS (p<0.05) while the mean villi length of fish fed the diet containing 1.5 parts per thousand. MOS was significantly longer (p<0.05) than that of the fish fed 4.5%. dietary MOS. The different levels of dietary MOS had no detrimental effects on liver tissue or general fish health.
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    Effects of dietary mannan oligosaccharides (MOS) on growth, body composition, and intestine and liver histology of the hybrid tilapia (Oreochromis niloticus x O. aureus)
    (2007) Genc, M. Ayce; Yilmaz, Erdal; Genc, Ercument; Aktas, Mevlut
    This is the first study on the effects of dietary mannan oligosaccharides (MOS) on growth, body composition, and intestine and liver histology of hybrid tilapia (Oreochromis niloticus x O. aureus). Experimental diets were prepared from commercial trout diet, supplemented with MOS at levels of 0, 1.5, 3.0, or 4.5 g MOS/kg feed and randomly assigned to triplicate groups. At the end of the trial, there were no significant differences between treatment groups (p>0.05) in growth parameters (live weight gain, specific growth rate, feed conversion ratio, protein efficiency ratio) or body indices (hepatosomatic and viscerosomatic). Dry matter and protein contents increased with increasing rates of dietary MOS (p<0.05) while the mean villi length of fish fed the diet containing 1.5%. MOS was significantly longer (p<0.05) than that of the fish fed 4.5‰ dietary MOS. The different levels of dietary MOS had no detrimental effects on liver tissue or general fish health.
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    Effects of dietary mannan oligosaccharides on growth, body composition, and intestine and liver histology of rainbow trout, Oncorhynchus mykiss
    (Israeli Journal Of Aquaculture-Bamidgeh, 2007) Yilmaz, Erdal; Genc, M. Ayce; Genc, Ercument
    This study investigated the effects of dietary mannan oligosaccharicles (MOS) on growth, body composition, and small intestine and liver histology of rainbow trout (Oncorhynchus mykiss Walbaum). Experimental diets were supplemented with 0 (control), 1.5, 3.0, or 4.5 g MOS per kg commercial trout feed and randomly assigned to treatment groups. Enhanced growth performance was generally observed in fish fed the diet supplemented with 1.5 parts per thousand MOS. Villi of fish fed diets supplemented with 1.5 or 3.0 parts per thousand MOS were longer than those of fish fed 4.5 parts per thousand or no dietary MOS (p<0.05). Protein contents increased as the rate of MOS increased (p<0.05). There were no significant differences in feed conversion ratio, protein efficiency ratio, or hepatosomatic index (p>0.05) and MOS had no detrimental effects on the intestine.
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    Effects of dietary Mannan-oligosaccharide on growth, intestine and liver histology of the African catfish (Clarias gariepinus (Burchell, 1822))
    (Ege Univ, Fac Fisheries, 2006) Genc, M. Ayce; Yilmaz, Erdal; Genc, Ercument
    Different levels of dietary mannan-oligosaccharide (MOS) administered for 80 days to African catfish (Clarias gariepinus) were evaluated for their efficacy on growth parameters, and intestine and liver histology. The following levels of MOS were used in commercial trout diet: 1%, 2% and 3% during the trial. At the end of the feeding period the live body weight gain and feed conversion ratio, hepatosomatic and gonadosomatic index values were found similar for all experimental groups (P>0.05). Also, dietary MOS did not significantly affect the liver and intestine histology.
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    Larval rearing of african catfish (Clarias gariepinus) using european pine sawfly (Neodiprion sertifer) larvae as direct food
    (Ege Univ, 2006) Genc, M. Ayce; Turan, Funda; Akyurt, Ihsan; Gokcek, Kaya; Demirci, Aydin; Gurlek, Mevlut
    The objective of this study was to compare the effects of different alternative (locally available) diets and their combination on growth of African catfish, Clarias gariepinus larvae. Fish larvae (mean weigth 2.70 +/- 0.08 mg, mean lenght 0.75 +/- 0.05 mm and 2 days old) were fed one of five diets containing commercial trout starter diet (TY as control diet), tubifex, European pine sawfly (Neodiprion sertifer: CAT) larvae, tubifex plus TY and CAT plus TY for 18 days. Growth was nearly similar in TY, Tubifex and CAT + TY groups and typically, retardation was detected especially in CAT group. On day 6, 10, 14 and 18 mean weight of the larvae varied significantly (p > 0.05) between the treatments. The results of this feeding trial showed that, the tubifex supplementation was (improve the efficiency of dry diet, TY) significantly improve the growth and survival rates (p < 0.05) and it is advisable than the other diets of this experiment.