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Öğe Açık denizde batırılmış uzun halat sisteminde yetiştiriciliği yapılan midyelerin ( mytilus galloprovincialis, lamarck 1819 ) yağ asit kompozisyonunun belirlenmesi(2011) Dernekbasi, Seval; Karayücel, Sedat; Karayücel, İsmihan; Öksüz, Abdullah[No abstract available]Öğe Comparative analysis of biochemical and fatty acid composition and mineral matter contents of cultured rainbow trouts (Oncorhynchus mykiss) in different stations(Tokat Gaziosmanpasa University, 2022) Dernekbasi, Seval; Karatas, Emin; Karayücel, İsmihanIn the study, the biochemical and fatty acid composition and mineral content of rainbow trout reared at different stations were compared. For this purpose, in terms of nutritional composition, rainbow trouts obtained from the A station had the highest protein and fat ratio. The lowest protein ratio was determined in the D station, and the lowest oil ratio was determined in the C station. Although the fatty acid contents of the feeds used by the enterprises were different between them, they were almost close to each other. Meristic, stearic, palmitic, oleic, linoleic, linolenic, arachidonic, EPA and DHA were determined to be dominant in the fillet fatty acid compositions of the cultured rainbow trouts at all the stations. Although the n-3/n-6 ratio, IA, FLQ and h/H indexes in fish muscles were at desired nutritional quality values, the IT index was at undesirable nutritional quality values. It was determined that the mineral substance amounts of the feeds obtained from different stations were Ca>P>K>Na>Fe>Mg>Zn>Mn>Se. The mineral substance amounts of rainbow trout obtained from different stations were determined as K>P>Mg>Na>Ca>Zn>Zn>Fe>Se. The amount of mineral substances in the fish samples taken from all the stations was determined to be quite high. As a result, it was determined that the trout obtained from all stations had suitable nutritional criteria. All fish can be considered good sources of nutrients, fatty acids and minerals.Öğe Effect of alternate feeding with fish oil- and peanut oil-based diets on the growth and fatty acid compositions of European seabass fingerlings (Dicentrarchus labrax) in the recirculated systems(Wiley, 2021) Dernekbasi, Seval; Karayucel, IsmihanThe aim of this study was to evaluate the effects of alternate feeding regime with fish oil- and peanut oil-based diets on fatty acid profiles and growth performances of European seabass fingerlings (Dicentrarchus labrax). Six trials were implemented; fish oil trial [C; continuously fed by diet with fish oil (FO)], peanut oil trial [P; continuously fed by diet with peanut oil (PO)], mixture oil trial (PC; continuously fed by diet containing both %50 FO and %50 PO), alternate cycled feeding three trials [(3P/3C; fish fed by diet with PO for 3 weeks and FO for the following 3 weeks), (3PC/3C; fish fed by diet with PC for 3 weeks and FO for following 3 weeks) and (9P/3C; fish fed by diet with P for 9 weeks and C for following 3 weeks)] for 12 weeks. Significantly higher SGR and the best FCR were detected in P and 3PC/3C and 9P/3C groups, respectively, compared with C group (p > 0.05). The lowest HSI and VSI were in the C group (p > 0.05). The highest crude protein was determined in 3P/3C group while protein ratios were higher in cycled fed groups than in the experimental groups (p > 0.05). The highest crude lipid were detected in P group (p > 0.05). The higher SFA level was detected in 9P/3C group (p < 0.05), whereas C group had the lowest content. While P group had the highest fillet MUFA content, which was predominantly made up of OA, the lowest MUFA was determined in the 3PC/3C and C groups. The highest LA was observed in C group (p < 0.05). The ArA was higher in the cycled fed groups than the diet groups. EPA, n-3 PUFA and n3/n6 rates were significantly higher (p < 0.05) in cycled fed groups, compared with the diet groups. The DHA ratio was significantly lower in 9P/3C group compared with the other groups. Also, the lipid quality of the flesh was directly related to the EPA and DHA ratios, and a higher quality product was revealed at the end of cycled feeding with the low IA, IT and high FLQ and h/H values obtained. This study shows that cycled feeding regimes by diets including vegetables oil and FO may be used in European seabass culture.Öğe Effect of Cycled Feeding by Diets Including Vegetable and Fish Oil on Growth Performances and Fatty Acid Profiles of Rainbow Trout (Oncorhynchus mykiss Walbaum, 1792)(Zoological Soc Pakistan, 2020) Dernekbasi, Seval; Karatas, EminThe aim of this study was to evaluate the effects of alternate cycled feeding regime with diets including different oil sources on fatty acid profiles and growth performances of rainbow trout. Seven trials were implemented; fish oil trial [FO; continuously fed by diet with fish oil (FO)], canola oil trial [CO; continuously fed by diet with canola oil (CO)], safflower oil trial (SFO; continuously fed by diet with safflower oil (SFO)], mixture oil trial (CSFO; continuously fed by diet containing both %50 CO and %50 SFO), alternate cycled feeding trial [(FO/CO; fish fed by diet with CO for 2 weeks and FO for the following 2 weeks), (FO/SFO; fish fed by diet with SFO for 2 weeks and FO for following 2 weeks) and (FO/CSFO; fish fed by diet with CSFO for 2 weeks and FO for following 2 weeks)] for 12 weeks. Significantly higher SGR and the best FCR were detected in the CSFO and FO/CSFO feeding groups, respectively, compared to the FO group (p>0.05). The lowest HSI and VSI were in the CO group (p>0.05). The highest crude protein, lipid and ash contents were determined in the FO/SFO group (p>0.05). Experimental diets containing vegetable oil (CO and SFO) and vegetable oil blend (CSFO) had significantly higher concentrations of n-6 fatty acids, predominantly in the form of linoleic (LA, 18:2n-6c) and oleic acid (OA, 18:1n-9c), while n-3 fatty acids were present in significantly higher concentrations in the FO group. The fatty acid composition of rainbow trout fillet reflected the dietary lipid source. Fillet of fish fed by the FO diet had highest eicosapentaenoic acid (EPA, 20:5n-3) and docosahexaenoic acid (DHA, 22:6n-3) amount. The n-3 PUFA accumulation (mainly EPA and DHA) was generally decreased in the fillets of the CO, SFO, CSFO groups compared to the FO group. The proportions of n-3 PUFA in the fillets of the FO/CO, FO/SFO and FO/CSFO groups throughout the experimental period were significantly higher than in the CO, SFO, CSFO groups, confirming the major effect of the fish oil intake at the cycled feeding stages of the experiment. This study shows that cycled feeding regimes by diets including vegtable and FO may be used in rainbow trout culture.Öğe Effect of Dietary Canola Oil Level on Fatty Acid Composition of Rainbow Trout (Oncorhynchus mykiss L.)(Israeli Journal Of Aquaculture-Bamidgeh, 2011) Dernekbasi, Seval; Karayucel, Ismihan; Oksuz, AbdullahThe effects of different levels of dietary canola oil on fatty acid composition of rainbow trout (Oncorhynchus mykiss) were investigated. Five experimental diets with equal protein (47%) and lipid (17%) contents were formulated for rainbow trout with a mean weight of 119 +/- 0.17g. Canola oil was used to replace 0, 25%, 50%, 75%, or 100% of the fish oil in the control diet. Fish were fed twice daily to satiation for 70 days. At the end of the study, fatty acid compositions in the trout body mirrored the fatty acid compositions of the experimental diets. The highest fatty acids were palmitic acid (C16:0), oleic acid (C18:1n-9), linoleic acid (C18:2n-6), and docosahexaenoic acids (C22:6n-3). The study showed that, under our test conditions, canola oil can replace 100% of fish oil with no negative effect on the chemical or fatty acid composition of rainbow trout.Öğe Effect of Dietary Canola Oil Level on Growth, Feed Utilization, and Body Composition of Rainbow Trout (Oncorhynchus mykiss L.)(Israeli Journal Of Aquaculture-Bamidgeh, 2010) Karayucel, Ismihan; Dernekbasi, SevalEffects of different levels of dietary canola oil on growth, feed utilization, and body composition of rainbow trout (Oncorhynchus mykiss) were investigated. Five experimental diets with equal protein (47%) and lipid (17%) contents were formulated to replace 0% (control), 25%, 50%, 75%, and 100% of the fish oil with canola oil. The diets were fed to fish (119 +/- 0.17 g) twice daily to satiation for 70 days. At the end of the experiment, wet weight gain, specific growth rate, relative growth rate, feed intake, feed conversion ratio, protein efficiency ratio, and protein intake were unaffected by the diet treatment (p>0.05). However, apparent net protein retention significantly differed (p<0.05) between the 50% group (33.64 +/- 1.74%) and the control (41.57 +/- 0.46%). The moisture content in the body composition of the fish dropped and the protein and lipid contents rose in all groups from the initial amounts. Our findings suggest that canola oil could be a suitable dietary lipid source for rainbow trout under our test conditions.Öğe Effect of Dietary Safflower and Canola Oil on Growth Performance, Body, and Fatty Acid Composition of Rainbow Trout (Oncorhynchus mykiss)(Taylor & Francis Inc, 2015) Dernekbasi, Seval; Kerim, Murat; Alagil, FikretThe objective of the present study was to evaluate the effects of the diets enriched with safflower and canola oil on growth, feed utilization, body composition, liver, and muscle fatty acid composition of rainbow trout (Oncorhynchus mykiss). Rainbow trout having approximate initial weight of 97.03 +/- 0.10 g were fed the experimental diets containing only fish oil (Group 0SFO), safflower oil (50% safflower oil, Group 50SFO and 33% safflower oil, Group 33SFO), and vegetable oil blend (33% safflower and 33% canola oil, Group 66SFCO) for 45 days. Twenty-five fish were randomly assigned for triplicate treatments and offered the test diets two times daily to apparent satiation. At the end of the experiment, survival was 100% in all treatments. No significant differences in the weight gain, specific growth rate, feed conversion ratio, and protein efficiency ratio were found between fish fed with the different experimental diets. The highest hepatosomatic index (HIS) and viscerasomatic index (VSI) was obtained in 50SFO and 33SFO groups, respectively. The moisture, protein, lipid, and ash content in the body composition of the fish increased in all experimental groups. The lipid content was not significantly different among the groups (p > 0.05); however, there was a significant difference in ash content between the control and the other groups (p < 0.05). The experimental diets containing vegetable oil (50SFO and 33SFO groups) and vegetable oil blend (66SFCO group) had significantly higher concentrations of n-6 fatty acids, predominantly in the form of linoleic acid (LA). The n-3 fatty acids were present in significantly higher concentration in the control treatment (0SFO). The fatty acid composition of fish fillet and liver were reflective of the dietary lipid source. While the fillet and liver of fish fed the 50SFO diet was high in linoleic acid (18:2 n-6), fish fed the 66SFCO diet had high concentrations of oleic acid (OA; 18:1 n-9). The present study suggests that fish oil can be replaced by up to 50% with safflower oil and by up to 66% with safflower + canola oil blend in rainbow trout diets with no significant effect on growth.Öğe Effect of Dietary Supplementation of Different Rates of Spirulina (Spirulina platensis) on Growth and Feed Conversion in Guppy (Poecilia reticulata Peters, 1860)(Medwell Online, 2010) Dernekbasi, Seval; Unal, Hatice; Karayucel, Ismihan; Aral, OrhanIn this study, effect of dietary supplementation of different rates (10% Group B, 20% Group C, 30% Group D, 40% Group E) of spirulina (Spirulina platensis) on growth and feed conversion in guppy (Poecilia reticulata) was compared with a commercial stamp food (Group A). Fish fed 40% spirulina performed better than those fed lower levels. At the end of the experiment, there were no significant differences between the all groups in terms of average final weights (p > 0.05). No significant differences were observed in specific growth rate, feed conversion rate and weight gain. However, there were significant differences in terms of feed conversion rate between groups (p < 0.05) and it was the highest in Group E (1.090 +/- 0.044) and the lowest in Group A (2.312 +/- 0.071). Therefore, the best growth rate (1.933 +/- 0.009) and live weight gain (0.085 +/- 0.006) were recorded in. Group E. As a result of the study, 40% spirulina supplementation in the diet for guppy has a positive effect on growth and feed conversion rates.Öğe Effect of Tributyltin on the Sex Ratio in Guppy (Poecilia reticulata)(Istanbul Univ Press, Fac Aquatic Sciences, 2019) Karayucel, Ismihan; Kirikoglu, Olcay; Dernekbasi, SevalIn this study, the effect of tributyltin (TBT) on the sex ratio in guppy (Poecilia reticulata) during the labile period covering both embryonic and post hatching periods was investigated. The gravid females was fed an artificial diet containing TBT chloride at an environmental levels of 25, 50 and 150ng/g feed from 16th day after the first parturition until next parturition. The newly hatched larvae from untreated females were also fed by the same diet for 11 days. TBT caused various abnormalities like body shape and fin deformations in gravid females and no parturition was seen. The male ratio significantly increased to 70.74, 87.50 and 87.18 % in the experimental groups of guppy larvae fed by 25, 50 and 150ng TBT/g diet, respectively. Survival and growth of the larvae were negatively affected by TBT treatment. These results clearly showed the masculanization of guppy exposed to TBT for the first time.Öğe Effects of mammalian blood with different glucose levels on reproduction, growth and survival of the southern medicinal leech, Hirudo verbana Carena, 1820(Elsevier, 2022) Karatas, Emin; Ceylan, Mustafa; Dernekbasi, SevalMedicinal leeches are generally fed using pure mammalian blood. In the present study repro-duction, growth and survival of medicinal leeches (Hirudo spp.) fed by mammalian blood with modified glucose level were investigated for the first time. Leeches were fed by cattle blood in a final glucose level of 152 mg/dL (control group; Glucose-free), 200 mg/dL (G200 group), 300 mg/dL (G300 group), 500 mg/dL (G500 group), 750 mg/dL (G750 group), 1000 mg/dL (G1000 group), 2500 mg/dL (G2500 group) and 5000 mg/dL (G5000 group) with the addition of D -Glucose Monohydrate. Greatest growth performance was determined in the G2500 group with a specific growth rate of 2.34% (final body weight: 10.37 & PLUSMN; 3.86 g) (P < 0.05). A quadratic increase was observed in the body weight values of the leeches depending on the glucose dose (Plinear and Pquadratic < 0.05). The greatest survival and gravidity rates were 89% and 38%, respectively, in the G750 group (P < 0.05). The increased glucose level caused a sharp decrease in the survival and gravidity rates of leeches. The glucose level did not significantly effected the cocoon and offspring productivity (P > 0.05). According to the broken line model, optimum glucose levels based on growth, survival rate and gravidity rate were 2461 mg/dL, 750.0 mg/dL and 749.9 mg/dL, respectively. The study showed that, although the optimum growth performance was obtained in the G2500 group, blood with glucose level of 750 mg/dL should be used for profitable medicinal leech culture considering survival and gravidity rates.Öğe Effects of total replacement of dietary fish oil by vegetable oils on growth performance, nutritional quality and fatty acid profiles of rainbow trout (Oncorhynchus mykiss) at optimum and high temperature conditions(Ege Univ, Fac Fisheries, 2021) Dernekbasi, Seval; Akyuz, Ayse Parlak; Karayucel, IsmihanThe present study investigated the effects of total replacement of dietary fish oil by different vegetable oils on growth performance, nutritional quality and fatty acid profiles of rainbow trout (Oncorhynchus mykiss) at optimum and high temperature conditions. Five iso-nitrogenous and iso-lipidic diets including 100% fish oil and vegetable oils were prepared for rainbow trout fingerlings with an average weight of 11.27 +/- 0.01 g. After the fish were fed experimental diets for 9 weeks at the optimum temperature (17.74 +/- 0.01 degrees C), all groups were fed an FO diet containing only fish oil for 4-weeks at the upper optimum temperature conditions (19.28 +/- 0.11 degrees C). In both feeding trials, experimental fish were hand-fed ad libitium twice a day. Results showed that growth performance and feeding efficiency were significantly better (p<0.05) in groups fed by VO-based diets compared to groups fed by FO based diet at optimum temperature. Survival was 100% in CANO, SFO, CO PNO groups and 94.12 +/- 3.39% in FO (control) group at the end of the 9 weeks. Growth, feed consumption and survival of fish fed the upper-optimum temperature were significantly differed (p<0.05). In particular, while the survival rate of the groups fed with vegetable oil-based diets at optimum temperature and then fed only fish oil remained 100%, this rate decreased to 54.17 +/- 1.39% in the control group. Eicosapentaenoic acid (EPA, 20:5n-3), docosahexaenoic acid (DHA, 22:6n-3) and n-3 PUFA of fish fed by VO based diets were low. When all groups were fed only FO diet for 4 weeks at upper-optimum temperatures, EPA, DHA and n-3 PUFA ratios increased. In addition, after the upper-optimum temperature trial, increases in the nutritional quality indices of fish meat were also detected.Öğe Egg- and seashell waste as a calcium source in snail (Cornu aspersum Müller, 1774) feed: I. Growth, mineral distribution in meat, shell and faeces, and environmental effects(Taylor & Francis Ltd, 2024) Celik, M. Yesim; Dernekbasi, Seval; Sariipek, MerveThis study evaluates the effect of diets containing three different sources of calcium (limestone, eggshell, and seashell) on the mineral composition of meat, shell, and faeces and their effect on shell structure and growth of Cornu aspersum. The diets were designated by the calcium source in their diets: chicken eggshell with its membrane (EG), seashell (SS), and limestone (LM). The results showed that the calcium content and mineral concentrations in the diet groups varied significantly depending on the calcium sources. The calcium sources influence the growth and excretion of minerals in the flesh, shell and faeces of the snails. The EG-feed had higher phosphorus (P) and zinc (Zn) levels than SS-feed and LM-feed. At the end of the experiment, the EG-group had grown larger than the other groups. The SS-group showed the lowest growth rate due to the high concentration of non-nutrient elements. Considering environmental implications, the lowest level of phosphorus, potassium and harmful heavy metals was found in the faeces of the EG group and the maximum amount in the SS group. In summary, the study shows that using eggshells offers a dual environmental benefit by recycling waste eggshells and releasing less P and K into the environment.Öğe Evaluation of sesame (Sesamum indicum) seed meal as a replacer for soybean meal in the diets of rainbow trout (Oncorhynchus mykiss Walbaum, 1792)(Ege Üniversitesi, 2017) Dernekbasi, Seval; Karayücel, İsmihan; Akyüz, Ayse ParlakA 60-day feedingtrial was conducted to asses the potential nutritive value of sesame seed mealas a dietary replacement for soybean meal in the diets of rainbow trout (Oncorhynchus mykiss Walbaum, 1792). Alldiets were prepared to be isonitrogenous (49% protein), isolipidic (19% lipid)and isoenergetic (22 kJ g-1). Four different diets containing 0% (C), 10%(10SSM), 15% (15SSM) and 20% (20SSM) sesame seed meal were formulated forrainbow trout with a mean weight of 81.02±0.02 g and fish were hand fed feedtwice a day to apparent satiety under a natural light regime. At the end ofstudy, significant differences were found in final body weight, weight gain andspecific growth rate (SGR, %) between control group (C) and the experimentalgroups (p<0.05). While there were no significant differences between theexperimental groups in terms of feed conversion ratio (FCR) and proteinefficiency rate (PER) (p>0.05), Apparent Net Protein Retention (ANPR)differed significant between C and 10SSM and 15SSM and 20SSM groups(p<0.05). The moisture, protein, lipid and ash contents in the bodycomposition of the fish increased in all experimental groups. The moisture, lipidand ash content were not significantly differed among the groups (p>0.05)but protein contents of fish in 15SSM and 20SSM groups was significantly higherthan fish in control and 10SSM groups (p<0.05). There were also nodifferences in the digestibility of crude protein among groups (p>0.05).Comparable performance in growth, nutrient utilization and crude proteindeposition of rainbow trout fed by diet containing 15% sesame seed meal showedthat these meals could be used as this rate.Öğe Farkli Isletmelerde Yetistirilen Gökkusagi Alabaliginin (Oncorhynchus mykiss) Vücut ve Yag Asit Profilleri(Kastamonu Üniversitesi, 2018) Dernekbasi, Seval; Hamzaoglu, GökhanBu arastirmada, ayni su kaynagi üzerindebulunan farkli isletmelerde yetistiriciligi yapilan gökkusagi alabaliklarinin (Oncorhynchus mykiss) vücutkompozisyonlari ve yag asit profilleri karsilastirilmistir. Balik etlerinin nem(%77.91) ve ham yag (%7.24) oranlari en yüksek A isletmesinde, ham protein (%19.90)orani ise en yüksek C isletmesinde tespit edilmis olup, bütün isletmelerarasinda besin kompozisyonu bakimindan, ham kül orani hariç, istatistikselolarak fark tespit edilmistir (p<0.05). Farkliliklar, farkli yemkaynaklarini kullanan isletmelerin balik kaslarindaki yag asit profillerinde degözlenmistir. Baliklarin HSI ve VSI degerleri A, B ve Cisletmeleri için sirasiyla, %1.98, 11.64; %1.34, 16.10; %1.89, 13.31 olarakbelirlenmistir. Baliklarin HSI degerleri A ve C isletmeleri arasinda farklilikgöstermemistir (p>0.05). Ancak A-B ve B-C arasinda farklilik tespitedilmistir (p<0.05). Tüm isletmelerden alinan baliklarin VSI degerleriarasinda ise farkliliklar belirlenmistir (p<0.05). Sonuç olarak, buisletmelerde yetistirilen baliklarin besin ve yag asit kompozisyonlaribakimindan aralarinda farkliliklar olmasina ragmen, yüksek seviyelerde EPA veDHA'nin yani sira n-3 ve n-6 yag asitlerinin makul derecede olumlu oranlariniiçermesi, tüm isletmelerdeki alabaliklarin insan beslenmesinde biyolojik açidandegerli gidalar oldugunu göstermistir.Öğe Kalsiyum Kaynagi Olarak Yumurta Kabuklarinin Yavru Kara Salyangozunun (Cornu Aspersum Müller, 1774) Büyüme Performansi Üzerine Etkileri(Tokat Gaziosmanpasa University, 2024) Dernekbasi, Seval; Karatas, Emin; Uzun Gören, Gülsen; Çelik, M. YesimBu çalismada, kalsiyum kaynagi olarak yeme ilave edilen yumurta kabugunun yavru kara salyangozlarin (Cornu aspersum) büyüme performanslari üzerindeki etkisi degerlendirilmistir. Arastirmada limestone (LMS) karsilik membranli (ES) ve membransiz (MES) olarak iki farkli sekilde yemlere ilave edilen yumurta kabuklari kullanilarak 3 deneme yemi hazirlanmistir. Deneme yemleri protein, lipid ve kalsiyum oranlari esit olacak sekilde hazirlanmistir. Deneme 45 gün süre ile yürütülmüs ve 15 günlük peryodlar halinde ara tartimlar yapilarak salyangozlarin büyüme oranlari takip edilmistir. Deneme sonunda en iyi büyüme, agirlik artisi ve SGR membranli yumurta kabugu ilave edilmis yemle beslenen grupta belirlenmistir (PÖğe Nutrient quality of the fillet and gonads of the European flounder (Platichthys flesus) in the Southern Black Sea(2024) Dernekbasi, Seval; Erdem, Mehmet Emin; Karayucel, IsmihanPlatichthys flesus is an important fisheries resource in the all Black Sea used for human consumption. It is an economic species, being caught for commercial pur- poses both in Europe and Türkiye. Therefore, the present study aimed to determine the nutritional quality indices and changes in biochemical and fatty acid compositions in flounder (Platichthys flesus) fillets and gonads caught from the Southern Black Sea in the reproduction period. While the moisture and lipid contents of flounder fillets were higher than the gonads, the protein and ash contents were determined to be higher in the gonads than in the fillets. The differences among them were found to be statistically significant (P<0.05). C14:0, C18:0, C16:1, C18:1n-9c, C20:1, C18:2n-6c and C18:3n-3 fatty acids in fillets, C16:0, C20:4n-6, C20:5n-3 and C22:6n-3 fatty acids in gonads were dominant. There were statistical differences between them (P<0.05). Among total fatty acids, SFA and PUFA were detected at higher rates in gonads and MUFA in fillets (P<0.05). The index of thrombogenicity (IT), hypocholesterolemic/ Hypercholest- er-olemic (h/H) and flesh lipid quality (FLQ) values were determined higher in gonads, and the index of atherogenicity (IA) value was determined higher in fillets. While there was no statistical difference between IT and h/H values (P>0.05), the differences be- tween IA and FLQ values were found to be significant (P<0.05). As a result, it is recommended to consume flounder, having commercial importance in Black Sea and important nutritional value in terms of protein and fatty acids compositions.Öğe Potential of Using Peanut Oil as Alternative to Fish Oil for European Seabass Diets (Dicentrarchus labrax) in Recirculated Systems(Adem Yavuz Sonmez, 2021) Dernekbasi, Seval; Karayucel, Ismihan; Karatas, Emin; Akyuz, Ayse ParlakThe effects of diets containing peanut oil at different ratios on growth performance, biochemical and fatty acid compositions of juvenile European seabass, Dicentrarchus labrax, were evaluated under controlled conditions in the recirculated system for 12 weeks. The trial was planned as 6 groups (18 tanks) with three replicates and stocked as 12 fish (mean weight similar to 4.72 +/- 0.01 g) in each tank and was fed by one of six experimental diets. Each diet was formulated to replace 0% (FO, control), 20% (PNO20), 40% (PNO40), 60% (PNO60), 80% (PNO80) and 100% (PNO100) of the fish oil with peanut oil. Feed conversion ratio (FCR) was the best in the PNO80 group (p<0.05). The fatty acid composition of the fillet reflects the fatty acids in the test diets. The polyunsaturated fatty acids (PUFA) of PNO60, PNO80 and PNO100 groups were lower than other experimental groups. The saturated fatty acids (SFA) were the highest in the PNO100 group. Some fatty acids [C16:0, palmitic acid (PA); C20:0, arachidic acid (AA); C18:1n-9c, oleic acid (OA); C20:1, eicosenoic acid (ESA); C20:3n-6, dihomo gamma-linolenic acid (gamma-ALA); C20:5n-3, eicosapentaenoic acid (EPA) and C22:6n-3, docosapentaenoic acid (DHA)] were present higher proportion in fillet of all groups compared to experimental diets. EPA was lower in control and PNO20 compare to experimental diets. As a result, the use of peanut oil in different ratios in the diets had not a negative effect on the growth and proximate composition of European sea bass. This study also indicates that as long as fish meal is available in the diet, peanut oil can be considered a reasonably effective replacement for fish oil in sea bass feeds.Öğe The effect of Tenebrio molitor larva meal instead of fish meal on growth performance and feed efficiency in juvenile Nile tilapia (Oreochromis niloticus) diets(2023) Dernekbasi, Seval; Karayucel, IsmihanThe aim of this study was to evaluate the effects of feeding Nile tilapia juvenile (Oreochromis niloticus) with diets based on fish meal (FM) and Tenebrio molitor (TM) larvae meal on growth performance and feed efficiency. For this purpose, three diets were prepared: Control diet (FM); without T. molitor larvae meal, insect diet (TM); 100% of fish meal has been replaced by T. molitor larvae meal and mixture diet (FM/TM); 50% of FM has been replaced by T. molitor larvae meal. Each treatment was tested in three replications over a 46-day. In the experiment, 1-month-old Nile tilapia juveniles with an average weight of 0.12±0.001 g were used. At the end of the experiment, the best growth was in the FM group, followed by the TM group and FM/TM group, the differences being significant except for FM and TM groups (P<0.05). Weight gain was also in line with growth rates. The SGR was 5.35%, 5.27% and 5.21% in FM, TM and FM/TM groups, respectively, and The difference between FM and FM/TM groups was statistically significant (P<0.05). The best FCR was in the FM group which was similar to TM diet (P<0.05). The worst FCR was in the group fed FM/TM diet with a significant difference from the other treatments. The PER changed between 0.87±0.07 and 1.42±0.04 with significant differences among the treatments. The survival rate was 100% in all groups. The data obtained showed that TM has the potential to be used as a protein source in diets of juvenile tilapia.Öğe The Effect of Using Peanut Meal Instead of Soybean Meal on Growth, Biochemical Composition and Fillet Color of Rainbow Trout (Oncorhynchus mykiss Walbaum, 1792)(2021) Dernekbasi, Seval; Kaya Öztürk, Dilara; Karayucel, IsmihanThe aim of this study was to determine the effect of using peanut meal instead ofsoybean meal in rainbow trout (Oncorhynchus mykiss Walbaum, 1792) feeds on growthperformance, biochemical composition and fillet color. For this purpose, rainbow trout(108.70±0.09 g) were fed for eight weeks with four different diets adjusted as iso-nitrogenic (45%protein), iso-lipidic (19% lipid) and iso-energetic (22 kJ g-1). While the CF (commercial feed)group was fed with commercial feed, three experimental diets containing 0% (Control-C), 50%(PNM50) and 100% (PNM100) peanut meal were formulated for the other groups. As a result ofthe 8 weeks study, the best final weight, weight gain and specific growth rate were found PNM50group and the difference among groups was found significant. (p<0.05). The use of peanut mealinstead of soybean meal in rainbow trout diets decreased fish meat protein ratios compared to CFand C groups. The qualities of redness, yellowness and hue were distinct between the diets in thedorsal and caudal locations. At all the measured regions in the C and CF groups did not result inany significant difference for chroma. It is thought that the differences between the measuredregions in L*, a*, b * are due to the fillet thickness and the preservation of the fillet coloringmatter. Consequently, 50% peanut meal instead of soybean meal in trout diets could be used indiets of rainbow trout without any negative effects on growth.Öğe The Evaluation of the Reproductive Performance of Land Snail, Cornu aspersum (Müller, 1774) without Photoperiod in the Non-breeding Season(Tokat Gaziosmanpasa University, 2022) Çelik, M. Yesim; Dernekbasi, Seval; Uzun Gören, Gülsen; Karatas, Emin; Karayücel, SedatThe purpose of this study was to investige the reproductive success of land snails (Cornu aspersum) without photoperiod during the non-breeding season in the Black Sea Region between December 2019 and January 2020. Snails, which were placed in cold storage for a hundred days, were awakened in December. The reproductive performances were assessed under semi-controlled laboratory conditions using the natural daylight cycle and the ideal temperature and moisture. The experiment was designed as a single group with 3 replications. The experiment was designed 3 replications, with 10 snails in each replicate in total of 30 snails. The reproductive performance of the snails was observed daily and the first mating took place on the 9th day of the study and the first egg-laying was detected in the second week of the study. The fecundity of the snails was 43%. Spawning activity was continued through to 3 weeks. The mean number of eggs, hatching rate and the number of offsprings were 151.13±22.02, 90.33±2.39% and 138.13±21.09, respectively. The mean egg and offspring live weights were 0.034±0.001 g and 0.03±0.007 g, respectively. The findings showed that the reproductive performance was low. In conclusion, reproductive performance is unsuitable for commercial snail production without the photoperiod treatment during the non-breeding season.
