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    Damizlik Baliklarin Performans ve Yumurta Kaliteleri Üzerine Karotenoid Içeren Yemlerin Etkisi
    (Isparta University of Applied Sciences, 2008) Yesilayer, Nihat; Karsli, Zafer; Dogan, Gaye; Aral, Orhan
    Damizlik yem formülasyonu hazirlanmasi balik yetistiricilerinin ve yem fabrikalarinin en temel görevlerinden birisidir. Yetistiriciligi yapilan balik türleri için yem yapim teknolojisi, yem karisimina giren maddeler ve yem/yemleme arastirmalari çok önemlidir. Damizliklarin yumurta üretimini etkileyen yem içerigindeki maddelere özellikle yag asidi, vitamin, probiotik, antioksidant ve karotenoidler üzerine arastirmacilar agirlik vermektedir. Dogadaki alabaliklarin kas, deri ve yumurtalarindaki kirmizi-portakal rengi karotenoidlerden kaynaklanmaktadir. Karotenoidler genelde pazara sunulmadan önceki belli bir periyotta balik yemlerine belirli konsantrasyonlarda katilan yemlerle besleme yaparak baliklarin pigmentasyonu için kullanilmaktadir. Karotenoidlerin yumurta rengine göre yumurtanin kalitesini ve yumurta sayisini pozitif yönde etkiledigini ve karotenoid konsantrasyonu ile yumurtadan çikis yüzdesi arasinda pozitif korelasyon oldugunu belirten birçok hipotezin var oldugu bilinmektedir. Bu nedenle derlemede, karotenoid içeren yemlerin damizliklarin yumurta üretimi ve kalitesi üzerine iliskisi incelenerek açikliga kavusturulmaya çalisilmistir
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    Effect of Ammonia at Different pH Values on Survival of Juveniles of Palaemon adspersus Rathke, 1837 (Decapoda: Palaemonidae)
    (Inst Zoology, Bas, 2021) Gfindogdu, Ayse; Harmantepe, Fatma Burcu; Karslr, Zafer; Dogan, Gaye
    The aim of the study was to determine the toxic effect of ammonia concentration on juveniles of Palaemon adspersus, a shrimp species important for both fisheries and food webs. Juveniles of P. adspersus were exposed to various ammonia concentrations (NH3) in acute toxicity tests at four pH values (6-9). The 24, 48, 72 and 96-hour LC50 values of total ammonia nitrogen (TAN) ranged from 114.82 to 67.61 mg/dm(3) at pH 6; from 120.23 to 69.18 mg/dm(3) at pH 7; from 87.10 to 54.95 mg/dm(3) at pH 8; from 79.43 to 19.95 mg/dm(3) at pH 9. The 24, 48, 72 and 96-hour LC50 values of NH3-N varied within range of 0.054 to 0.037 mg/dm(3) at pH 6, 0.569 to 0.309 mg/dm(3) at pH 7, 3.846 to 2.291 mg/dm(3) at pH 8 and 24.547 to 6.166 mg/dm(3) at pH 9. It was determined that high pH values noticeably decreased the tolerance of juveniles of P. adspersus to TAN and NH3-N. Mortality rates increased in parallel with increasing NH3 concentrations, pH and exposure time.
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    Effects of dietbome copper on accumulation hi the tissues and organs, growth and feed utilization of rainbow trout (Oncorhynchus mykiss, Walbaum, 1792) Juvenile
    (2009) Gundogdu, Ayse; Harmantepe, F. Burcu; Dogan, Gaye; Karsli, Zafer; Asci, Mehtap Yagan
    The present experiment was conducted to study effects of elevated dietary Cu and establish upper limits of Cu in fish feed. Accumulation and growth of dietbome copper in the gill, muscle tissue, digestive system and whole body of rainbow trout (Oncorhynchus mykiss, Walbaum). Four experimental isonitrogenic (460 g kg-1) and isolipidic (200 g kg-1) diets were formulated. Diets were prepared by adding 0 (control), 0.1, 0.4 or 1.6 g kg-1 CuSO4.5H2O feed, respectively. Each diet was randomly assigned to triplicate groups of 576 juvenile fish whose average weight 19.97±0.048 g. Fish were fed to satiation for experimental period. After 15, 30, 45 and 60 days, the fish were sampled and Cu accumulation in the gill, muscle tissue and the digestive system were determined. The data were presented in ug of sample Dry Weight (DW). At the end of the trial, with increasing dietary Cu concentration, Cu accumulation of gill, muscle tissue, liver and the digestive system were increased. However, accumulation of gill were not significant (p>0.05) in the fish fed with 0.4 (D 3) and 1.6 (D 4) g kg-1 CuSO4.5H2O diets. Accumulation of muscle tissue were not significant (p>0.05) in the fish fed with 0 (D 1) and 0.1 (D 2) g kg-1 CuSO4.5H2O diets. The accumulation of Cu in the digestive system increased with increasing dietary Cu concentration and at periyot were significant (p<0.05) in group fed with the highest Cu concentration diet. © Medwell Journals, 2009.
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    Effects of Diets Containing of Brown Fish Meal and White Fish Meal on Growth of Rainbow Trout, Oncorhynchus mykiss (WALBAUM, 1792) Juveniles
    (Isparta University of Applied Sciences, 2008) Harmantepe, Fatma Burcu; Dogan, Gaye; Karsli, Zafer; Aral, Orhan; Kaya, Dilara
    In this study, the effect of dietary inclusion of brown fish meal (anchovy, Engraulis encrasicolus L.) and white fish meal (Cod, Gadus morhua L.) on growth performance, feed utilization, protein utilization, nitrogen accumulation and nitrogen loading in juvenile rainbow trout (Oncorhynchus mykiss W.) was investigated. Two experimental isonitrogenic (460 g kg-1) and isolipidic (200 g kg-1) diets were formulated. Each diet was randomly assigned to triplicate groups of 120 juvenile fish with an initial body weight of 10 g. Fish were fed twice daily to satiation for 30 days. At the end of the trial the best spesific growth rate, feed conversion rate, protein efficiency ratio, nitrogen accumulation and nitrogen loading of the group fed white fish meal were obtained and the differences between groups of these parameters were significant (p<0.05)
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    Effects of Hazelnut Meal Levels on Growth Performance, Feed Utilization and Digestibility in Juvenile Rainbow Trout (Oncorhynchus mykiss)
    (Central Fisheries Research Inst, 2010) Dogan, Gaye; Erdem, Muammer
    In this study, the effects of hazelnut meal (HM) levels in juvenile rainbow trout (Oncorhynchus mykiss) diets on growth, feed consumption, and digestibility were investigated. Four experimental diets containing a gradient of HM (0%, 15%, 30% and 45% respectively) were prepared to feed two replicate groups of trout (initial body weight of 37.89 +/- 0.02 g) twice daily to apparent satiation for 60 days. The highest weight gain rate (WGR) and specific growth rate (SGR) were obtained from the fish fed with Diet 1 and Diet 2 and it was determined that the increase of HM level in the diet up to 30% did not affect feed conversion ratio (FCR) and protein efficiency ratio (PER). The lowest WGR, SGR and PER were obtained from the fish fed with the diet containing 45% HM. The apparent digestibility coefficients (ADC) of protein (90.93-91.76%) and lipid (96,78-98.33%) were at high with no significant difference among treatment (P>0.05). The ADC of dry matter decreased with increasing HM in diets. These results indicated that HM can be utilized by 15% in diet for juvenil rainbow trout, without adverse effect on growth performance.
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    Elimination of copper in tissues and organs of rainbow trout (Oncorhynchus mykiss, Walbaum, 1792) following dietary exposure
    (Taylor & Francis Ltd, 2011) Gundogdu, Ayse; Harmantepe, F. Burcu; Karsli, Zafer; Dogan, Gaye
    Copper (Cu) elimination was investigated in the tissue and organs of rainbow trout (Oncorhynchus mykiss, Walbaum, 1792), after Cu-free diets exposure. In the current study, fish were fed to satiation on diets containing 0.022 (Group 1; Control), 0.043 (Group 2), 0.123 (Group 3), 0.424 (Group 4) g Cu*kg(-1) diet for 60 days before elimination experiment. A total of 288 fish (mean weight 84.28 +/- 1.05 g) were randomly transferred to 12 fibreglass tanks. The fish were fed the Cu-free diet twice daily, until apparent satiation, during 60 days. Subsequently, the experiment was established for a period of elimination, during which samples were taken at days 15, 30, 45 and 60. Cu concentration in the muscle, gill tissue, digestive system, liver and whole body of fish were determined after 60 days depuration. Cu concentrations in tissues of rainbow trout decreased during depuration period, and the order of Cu elimination in tissue and organs of rainbow trout was: digestive system (73.1 %), then gill (41.1 %), muscle (31.5 %) and liver (17.2 %) for group 2; digestive system (74.1%), then muscle (65.8%), gill (60.0%) and liver (34.6%) for group 3; and digestive system (85.8%), then muscle (80.8%), liver (50.5%) and less/equal in gill (50.2%) for group 4. In statistical analysis, both groups and time were significant factors (P<0.05) on elimination rate. Moreover, significant interaction between groups and time were identified on elimination rate. Digestive system showed the fastest elimination rates of Cu at all groups compared with other tissues.
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    The Effects of Diets containing Hazelnut Meal Supplemented with Synthetic Lysine and Methionine on Development of Rainbow Trout, Oncorhynchus mykiss
    (2015) Dogan, Gaye; Bircan, Recep
    Araştırmada, balık ununa dayalı kontrol yemi ile artan oranlarda sırasıyla %10, %20, %30, %40 ve %50 oranlarında fındık küspesi içeren, izonitrojenik ve izokalorik altı farklı araştırma yemi hazırlanmıştır. Araştırma yemlerinin metiyonin ve lizin içeriklerini mümkün olduğunca dengelemek amacıyla kontrol yeminin lizin ve metiyonin içeriği esas alınarak, kontrol yemi dışındaki araştırma yemlerinin yapısına sentetik lizin ve metiyonin ilave edilmiştir. Ortalama canlı ağırlıkları 114.160.03 g olan gökkuşağı alabalıkları, her grup için 3 tekerrür olacak şekilde stoklanmış ve hazırlanan araştırma yemleriyle 60 gün boyunca günde iki kez doyuncaya kadar yemlenmişlerdir. Araştırma sonunda, spesifik büyüme oranı, oransal büyüme oranı, yem değerlendirme sayısı, protein değerlendirme randımanı ve prodüktif protein değeri bakımından gruplar arasında istatistiksel olarak önemli bir fark bulunamamış ancak en iyi değerler %40 fındık küspesi içeren gruptan elde edilmiştir (P0.05). Protein sindirim oranının yemdeki fındık küspesi oranından etkilenmediği, toplam sindirim ve yağ sindirim oranının ise yemdeki fındık küspesi oranının %50ye çıkmasıyla önemli derecede azaldığı belirlenmiştir (P0.05). Bu araştırma; fındık küspesinin sentetik lizin ve metiyonin ilavesiyle, gökkuşağı alabalığı yeminde %40 oranında kullanılabileceğini göstermiştir.