Yazar "Karayucel, Ismihan" seçeneğine göre listele

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    A Study on Some Biological Parameters of Crayfish (Astacus leptodactylus Eschscholtz, 1823) in Ulugöl, Samsun, Turkey
    (2021) Gören, Gülşen Uzun; Karayücel, Sedat; Karayucel, Ismihan
    The study aimed to investigate some morphometric traits, length-weight relationship, meat yield,\rfecundity and some biochemical compositions of Astacus leptodactylus, in one of the Bafra Fish\rLakes named Ulugöl, Samsun, Turkey. A total of 378 A. leptodactylus (198 female and 180 male)\rwere examined. The average carapace length was 50.96±0.46 mm for females, 51.31±0.66 mm for\rmales and 51.13±0.40 mm for all sampled crayfish. Abdomen length was 52.36±0.49 mm for\rfemales, 49.26±0.62 mm for males and 50.87±0.40 mm for all sampled crayfish. Live weight was\rbetween 14.38 g and 105.03 g with an average of 38.26±0.73 g. The average weight of females was\rless than that of males. There was a strong relationship between length and weight. The weight of\rcrayfish with pleopodal eggs ranged from 28.24 g, to 59.50 g with an average of 41.73±1.09g. The\raverage number of eggs per individuals was 192.90±9.94 with an average number of 4.62±0.21 per\runit of live weight. The average total egg weight was 3.35±0.19 g while the average egg diameter\rwas 2.17±0.03 mm. Abdomen meat was lower for males comparing with females. Average\rmoisture, crude ash, crude oil and crude protein of abdomen meat were 81.27%, 1.47%, 0.81% and\r16.45%, respectively
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    Determination of Seasonal Vitamin and Mineral Contents of Sea Bream (Sparus aurata L., 1758) Cultured in Net Cages in Central Black Sea Region
    (Humana Press Inc, 2019) Ozturk, Dilara Kaya; Baki, Birol; Karayucel, Ismihan; Ozturk, Recep; Goren, Guelsen Uzun; Karayucel, Sedat
    This study aimed to determine the seasonal vitamin and mineral contents of sea bream (Sparus aurata) cultured in net cages in Central Black Sea region. The average seasonal A, D-3, and E vitamins values in fish meat were between 0.27 +/- 0.02-0.60 +/- 0.00, 0.98 +/- 0.01-1.70 +/- 0.00, and 3.10 +/- 0.14-6.00 +/- 0.21mg/kg, respectively (p<0.05). The average seasonal Ca, Fe, K, Mg, Na, P, Zn, and Se values in fish meat were between 276.90 +/- 0.99-1788.50 +/- 51.27 (p<0.05), 3.50 +/- 0.12-4.47 +/- 0.18 (p>0.05), 4244.50 +/- 8.84-4761.50 +/- 1.06 (p<0.05), 251.55 +/- 2.55-312.65 +/- 11.42 (p<0.05), 56.49 +/- 0.04-128.75 +/- 0.18 (p<0.05), 2234.50 +/- 15.20-2619.00 +/- 7.07 (p<0.05), 5.62 +/- 0.10-15.30 +/- 0.22 (p<0.05), and 0.30 +/- 0.00-0.38 +/- 0.01mg/kg (p>0.05), respectively. As a result, it can be concluded that sea bream cultured in the Central Black Sea region is a rich source of nutrients in terms of vitamins and mineral matters, and fish size, feed quality, and the environmental factors are influential on the contents of vitamin and mineral substances in the fish tissue.
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    Development of Mussel (M. galloprovincialis L., 1819) Seed on Different Combined Collectors Used on Raft System, in Sinop, Black Sea
    (Medwell Online, 2009) Karayucel, Sedat; Celik, Meryem Yesim; Karayucel, Ismihan; Erik, Goekhan
    Raft system was practiced for mediterranean mussel (Mytilus galloprovincialis) culture in Sinop Region, Black sea. Four different types of collectors (A type collector was in 14 mm diameter nylon rope which is suspended from the the raft in known mussel settlement time. B type collector was in 14 mm diameter nylon rope which is suspended one month early from the known mussel settlement time. C type collector was in 22 mm diameter and made from old ship rope. D type colllector was in 19 mm diameter and made from old anchovy net) was conducted to investigate, effect of collector type on settlement. The results showed that collector types had a significant effect spat settlement. Both shape and surface structure of the collector was found significant (p<0.05). The filementous and thready surfaces of C and D type collectors were prefered by spats for initial settlement. D type collector had a highest density with 6.37 +/- 0.60 ind cm(-2). At the end of 8 months experimental period, the number of spats on A, B, C and D type collectors were found as 1218 +/- 7.90, 1344 +/- 6.80, 3480 +/- 5.10 and 3800 +/- 5.40 ind m(-1), respectively.
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    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, Ismihan
    The 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.
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    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, Abdullah
    The 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.
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    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, Seval
    Effects 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.
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    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, Orhan
    In 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.
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    Effect of Temperature on Some Reproductive Parameters of Gravid Females and Growth of Newly Hatched Fry in Guppy, Poecilia reticulta (Peters, 1860)
    (Medwell Online, 2008) Karayucel, Ismihan; Orhan, A. K.; Karayucel, Sedat
    In this study, the effect of temperature on growth and some reproductive parameters of guppy Poecilia reticulata were investigated. And 19, 21, 22.5, 26, 29, 32 and 35 degrees C water temperature treatments were used on newly hatched fry and gravid females for 11 days after parturitions and several days starting from the 16th day after first parturition until second parturition, respectively. Survival rates of heat treated fry were lower in the high temperature groups of 29 degrees C and over than the low temperature groups of 22.5 degrees C and lower. Same trend was observed for gravid female which all died in the temperature groups of 29 degrees C and over. Guppy fry grown better at temperature between 22.5-26 degrees C and the gravid female guppy produced high number of fry at temperature between 21-26 degrees C may support the hypothesis that an ontogenetic reduction in temperature optima with increasing size for growth and the optimum temperature for growth broadness as body increases. However, size and sex dependent optimum temperature range for optimum growth and reproduction of guppy could be in question.
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    Effect of Tributyltin on the Sex Ratio in Guppy (Poecilia reticulata)
    (Istanbul Univ Press, Fac Aquatic Sciences, 2019) Karayucel, Ismihan; Kirikoglu, Olcay; Dernekbasi, Seval
    In 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.
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    Effects of stocking density on survival, growth and biochemical composition of cultured mussels (Mytilus galloprovincialis, Lamarck 1819) from an offshore submerged longline system
    (Wiley, 2015) Karayucel, Sedat; Celik, Meryem Yesim; Karayucel, Ismihan; Ozturk, Recep; Eyuboglu, Bora
    This study examined an offshore submerged mussel longline system, in the Black Sea, from May 2009 to May 2010. The system was allowed 1year for spat collection. After a 1-year spat collection period, some spat collectors were left untouched (NS), and some spat collectors were grazed and socked (S) for a grow-out study in May 2009. The effects of stocking density on the growth and survival of the S and NS mussels were examined. The biochemical composition of the mussels was also determined. Environmental factors including temperature, salinity, chlorophyll a, total suspended matter, inorganic matter and organic matter were monitored monthly during the experimental period. In May 2010, the mean length and live weight of the S and NS mussels were 60.46 +/- 0.60mm and 53.34 +/- 0.37mm, respectively, and 20.50 +/- 0.50g and 13.11 +/- 0.26g respectively. Mean moisture and ash were 82.35 +/- 0.47% and 6.67 +/- 0.44% respectively. Mean carbohydrate, protein and lipid were 27.74 +/- 2.40%, 57.68 +/- 2.15% and 7.91 +/- 0.68% respectively. These results indicate that a submerged offshore mussel culture system in the Black Sea can be commercially convenient. In addition, stock management via thinning out of the spat can considerably increase the marketable size of mussels, reduce harvest time and produce better growth.
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    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, Ismihan
    The 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.
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    Meat Yield, Condition Index, and Biochemical Composition of Mussels (Mytilus galloprovincialis Lamarck, 1819) in Sinop, South of the Black Sea
    (Taylor & Francis Inc, 2012) Celik, Meryem Yesim; Karayucel, Sedat; Karayucel, Ismihan; Ozturk, Recep; Eyuboglu, Bora
    Monthly variations in meat yield and biochemical composition of Mediterranean mussels on lantern nets were investigated from May 2005 to May 2006, in Sinop, south of the Black Sea. Dry weight condition index was between 2.66 and 7.10% with a mean of 4.86 +/- 0.36%. Meat yield was maximum (26.69%) in March and minimum (17.43%) in October. Moisture values were between 78% (in June) and 86% (in April). Protein content in dry weight of mussels reached the highest value in February (74.64%) before the spawning time. Lipid value was maximum (18.03%) in May 2005.
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    Monthly variation of growth, biochemical composition, fatty and amino acids patterns of gilthead sea bream (Sparus aurata) in offshore cage systems under brackish water conditions in the Black Sea
    (Wiley, 2020) Ozturk, Dilara Kaya; Ozturk, Recep; Baki, Birol; Karayucel, Ismihan; Karayucel, Sedat
    The aim of this study was to investigate seasonal variations of growth performance and biochemical composition, fatty and amino acids profiles of cage-cultured gilthead sea bream (Sparus aurata) in the Black Sea. The research was carried out on a yearly basis in the offshore cage systems of a commercial fish farm located on the coast of Samsun province, Turkey. Fish with an initial average weight of 2.44 +/- 0.03 g reached a harvest weight of 474.60 +/- 8.64 g with a survival rate of 94.26 +/- 0.60% in 14 months. The average specific growth rate and feed conversion rate were 0.92 +/- 0.30% and 1.45 +/- 0.05 respectively. Seasonal variation of total essential and total non-essential amino acids and EAA/NEAA ratios ranged between 7.80 +/- 0.00-11.22 +/- 0.02 g/100 g, 8.19 +/- 0.00-9.94 +/- 0.01 g/100 g and 1.01 +/- 0.00-1.18 +/- 0.01 respectively (p < 0.05). The average of total omega-3, omega-6 and omega-9 values were 11.63 +/- 0.68%, 24.29 +/- 0.84% and 28.78 +/- 0.17% respectively. It was determined that gilthead sea bream showed a remarkable growth performance over the 14 months period under offshore marine conditions in the Black Sea. Growth performance, biochemical composition, fatty and amino acids profiles in fish were influenced by seasonal changes of water temperature and nutritional value of the used diets. Findings of the present study provide remarkable information in terms of the year-round growth performance and meat quality of cage-cultured gilthead seabream based on a long-term evaluation throughout the full-cycle of 14-month production period of a commercial cage farm operating in offshore conditions in the Black Sea area.
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    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, Ismihan
    Platichthys 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.
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    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 Parlak
    The 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.
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    Settlement and growth of the mussels (Mytilusgalloprovincialis, Lamarck, 1819) on different collectors suspended from an offshore submerged longline system in the Black Sea
    (Wiley, 2016) Celik, Meryem Yesim; Karayucel, Sedat; Karayucel, Ismihan; Eyuboglu, Bora; Ozturk, Recep
    A study of spat settlement of a submerged longline mussel culture system was carried out in Sinop area, Black Sea, between May 2008 and May 2009. The effects of six different types of collectors on spat settlement and growth were investigated. Six different types of spat settlement rope were used as polypropylene ropes with 18 mm diameter, 18 mm diameter timeworn silk rope, 22 mm diameter rope made from old hawser (OSR), 22 mm diameter ropes made from old anchovy net without pegs, 18 mm diameter old used nylon ropes and 18 mm diameter tasselled polypropylene ropes. Monthly temperature, salinity, chlorophyll-a, total suspended matter, inorganic matter and organic matter were determined during the experimental period. The best settlement was observed on the OSR type when measured per metre (3450.00 +/- 125.83 ind m(-1)). Consequently, the findings showed that settlement preference of spat occurred according to rope structure, and if ropes are designed to combine numerous well-fixed tassels, spat settlement can increase. Spat growth was affected by environmental factors and rope structure. In addition, the study revealed a negative relationship between density and growth.
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    Some reproductive characteristics of Uranoscopus scaber Linnaeus, 1758 (Pisces: Uranoscopidae) in the Black Sea (Turkey)
    (Cahiers De Biologie Marine, 2011) Ak, Orhan; Kutlu, Sebahattin; Karayucel, Ismihan
    A total of 988 Atlantic stargazer, Uranoscopus scaber, was collected monthly by bottom trawlers from the Eastern Black Sea. Reproduction characteristics such as sex composition, maturity stage, length at first maturity, spawning time, reproduction period, fecundity, length-weight relationships and condition factor were investigated. The percentage of females, males and indefinite were 66.90, 29.65 and 3.44%, respectively. The female:male sex ratio was 2.26:1 (P < 0.05). Mean condition factors of females and males were 0.991 and 0.956, respectively. Taking into consideration of gonado-somatic index (GSI) values and egg diametre, it was determined that reproduction occurred in July and August. The first maturity age for female and male was 2 and the first reproduction lengths were 11.76 and 13.75 cm for male and female, respectively. The exponentially relationships between fecundity and total length was F = 0.2283TL(3.6314) (R-2 = 0.53) and the linear relationship between fecundity and fish weight was F = 118.9W - 1788.8 (R-2 = 0.34). The average egg number that a female spawned at once was 16185 +/- 1455. The average diametre of mature eggs was 1.55 +/- 0.05 mm. There were significant differences between sexes in monthly condition flictors (P < 0.01).
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    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, Ismihan
    The 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.
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    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, Ismihan
    The 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.
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    The effects of environmental factors on survival, growth and biochemical composition of transplanted oysters (Ostreaedulis Linnaeus, 1758) from Aegean Sea to southern Black Sea
    (Wiley, 2015) Celik, Meryem Yesim; Karayucel, Sedat; Karayucel, Ismihan; Eyuboglu, Bora; Ozturk, Recep
    This study examined survival, growth rate and biochemical composition of oysters (Ostrea edulis) when transplanted from Aegean Sea to southern Black Sea (Sinop) and maintained offshore in a submerged long-line from December 2008 to December 2009. In December 2009, the mean length and live weight were 92.52 +/- 1.40mm and 109.60 +/- 2.41g respectively. Mean specific growth rate (SGR) was found as 1.29 +/- 0.16%. Meat yield ranged from 7.90 to 11.47%. Mean moisture and ash were 81.40 +/- 0.52% and 9.50 +/- 0.55% respectively. Protein content was between 36.57% and 61.31% with a mean of 50.17 +/- 2.13%, while lipid content was between 4.83% and 10.86% with a mean of 7.74 +/- 0.49%. Carbohydrate content was between 20.88% and 46.89% with a mean of 32.59 +/- 2.38%. The study demonstrated that protein, lipid and carbohydrate were used for different metabolic needs of oysters. Mortality was dependent on physiological stress related to the gonadal activity, temperature and inorganic matter in seawater. Consequently, the low salinity rate has a negative impact on growth rate of oyster. However, there was not a serious adaptation problem in transplanted oysters from Aegean Sea to Black Sea.