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Öğe Effect of dietary olive pomace oil and L-carnitine on growth and chemical compostion of African catfish, Clarias gariepinus (Burchell, 1822)(2004) Yilmaz, Erdal; Naz, Mehmet; Akyurt, IhsanThe effects of dietary olive pomace oil and L-carnitine on growth performance, body indices and chemical composition of African catfish, Clarias gariepinus, were investigated. A 3×2 factorial design was used by offering diets having three different energy/protein ratios and supplemental L-carnitine at either 0 or 2000 mg/kg diet. Ten juvenile African catfish (12 g/fish) were stocked into 80-1 glass aquaria and fed an experimental diet for seven weeks. The L-carnitine supplementation did not affect body indices. However, growth and chemical composition were influenced by both dietary lipid and L-carnitine. The increase in muscle lipid was greater than in the liver for all treatments. Fish fed the high energy diet (9% olive pomace oil) had a low appetite and feed intake, while fish fed the low energy diet (3% olive pomace oil) and supplemental L-carnitine had better feed intake and growth. On the other hand, fish fed the high energy diet (9% olive pomace oil) with or without L-carnitine had better feed conversion.Öğe Effect of feeding frequency on the growth and survival of Himri Barbel Barbus luteus (Heckel, 1843), fry under laboratory conditions(Asian Network for Scientific Information, 2008) Gokcek, C. Kaya; Mazlum, Yavuz; Akyurt, IhsanThe effect of feeding frequency on the growth performance, feed conversion ratio and survival of Himri Barbel, Barbus luteus, was investigated. Thirty fry (0.26±0.03 g) were stocked in 12 (80-L) (80×40×40 cm) aquaria and fed 3, 4, 5 and 6 times a day respectively for 60 days. Final body weights and SGR were measured significantly lower at D (6 times/day) and C (5 times/day) than B (4 times/day) and A (3 times/day) treatments (p<0.05). There were no significant differences for the FCR and survival rates (p>0.05). The results showed that weight gain and growth performance of Himri Barbel, B. luteus, fry were decreased with increased feeding frequency. © Asian Network for Scientific Information, 2008.Öğe The effect of stocking density on yield, growth, and feed efficiency of himri barbel (Barbus luteus) nursed in cages(Israeli Journal Of Aquaculture-Bamidgeh, 2007) Gokcek, C. Kaya; Akyurt, IhsanHimri barbel (Barbus luteus Heckel, 1843) fingerlings (mean wt 15.73 g) were stocked at 40, 60, 80, or 100 fish per cage in 1-m(3) cages suspended in a reservoir lake to determine total yield, growth rate, and feed efficiency after seven months. Total yields increased as the stocking density increased and were 3.59, 4.80, 6.32, and 7.91 kg per cage, respectively. The highest mean fish weight was obtained in the lowest stocking density. Neither the food conversion ratio nor the mortality rate was affected by stocking density.Öğe Effects of energetic diets on growth, blood chemistry, and liver pathology of African catfish, Clarias gariepinus (Burchell 1822)(Society Of Israeli Aquaculture & Marine Biotechnology, 2006) Yilmaz, Erdal; Akyurt, Ihsan; Mutlu, EkremThe effects of isonitrogenous diets (350 g crude protein/kg diet) with different energy levels (10.85, 11.82, 12.73, 13.69, and 15.06 MJ dietary energy/kg feed) on growth, feed utilization, blood chemistry, and liver histopathology of African catfish, Clarias gariepinus, were investigated to determine the optimum diet for this species. The diet containing 12.73 MJ digestible energy/kg feed resulted in the best growth, blood parameters, and liver histology. Fish that consumed the 10.85 and 11.82 diets had similar weight gains, feed, and protein utilization as fish fed diets containing 13.69 or 15.06 MJ (p > 0.05) but fish fed diets containing 13.69 or 15.06 MJ/kg had signs of hepatic lipidosis.Öğe Growth characteristics, sex inversion and mortality rates of striped sea bream, Lithognathus mormyrus L., in Iskenderun Bay(2003) Türkmen, Mustafa; Akyurt, IhsanThe total length of examined samples of striped sea bream in ?Iskenderun Bay ranged from 9.1 to 27.7 cm. The lengthweight relationship constants for males (a = 0.0112, b = 3.042) and females (a = 0.0105, b = 3.069), showed no significant difference from isometric growth (P < 0.05). Von Bertalanffy growth parameters in length were L? = 26.55 cm, K = 0.203 y-1 and t0 = -1.81 y for males and L? = 32.64 cm, K = 0.136 y-1 and t0 = -2.12 y for females. Sex inversion occurred at lengths between 11.2 and 22.9 cm in age groups I-VI. Males were observed up to a length of 22.8 cm. Total, natural and fishing mortality rates were Z = 1.15 y-1, M = 0.48 y-1 and F = 0.67 y-1 respectively. The exploitation rate of E = 0.60 indicates that the population is being heavily exploited. Reproductive activity of striped sea bream in Iskenderun Bay took place between the second half of April and early August, with the greatest intensity in May. Lengths at first maturity were 13.4 cm for males and 13.9 cm for females.Öğe 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, MevlutThe 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.Öğe Population biology of sand crab [Portunus pelagicus (Linneaus, 1758)] blue crab [Callinectes sapidus Rathbun, 1896] in Iskenderun Bay(Ege Univ, 2006) Ozcan, Tahir; Akyurt, IhsanThe Indo-Pacific originated sand crab [Portunus pelagicus (Linneaus, 1758)] and Atlantic originated blue crab (Callinectes sapidus Rathbun, 1896) were observed in Iskenderun Bay between July 2002 and June 2003. The study was based on the comparison of length distribution and sex ratio of crabs. A total of 467 individuals (139 blue crabs and 328 sand crabs) were examined. The males of sand crab was determined to be dominant representing 58% of the population, and the average width of long carapace of females was found to be 119.9 +/- 2,8 mm, while the carapace width for males was 104,9 +/- 2,1 mm in average. The case seems to be contrast for blue crab female population, which was dominant with the proportion of 69% and average width of long carapace of them was found to be 148,9 +/- 2,5 mm. The average width of long carapace was 123,3 +/- 3,4 mm for males, which represented 31% of the total population.Öğe Protective effect of clinoptilolite on lead toxicity in common carp Cryprinus carpio(2004) Tepe, Yalçin; Akyurt, Ihsan; Ciminli, Canan; Mutlu, Ekrem; Çalişkan, MahmutProtective effects of clinoptilolite, a natural zeolite, on lead toxicity in common carp Cyprinus carpio were investigated. Sublethal concentrations of lead nitrate (60 mg/L) in water for a 35-day period decreased both the soluble protein and RNA contents in the liver of the common carps and also caused significant changes of some biochemical parameters. The treatment of exposure water with clinoptilolite (50 mg/L) decreased lead accumulation in fish. No adverse effects of clinoptilolite application were observed.
