Browsing by Author "Guzel, Senol"

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The Effect of Cucumber (Cucumis Sativus) Cultivation in Aquaponic and Hydroponic Systems on Plant Nutrient Elements and Antioxidant Enzyme Activity
(Parlar Scientific Publications (p S P), 2018) Guzel, Senol; Odun, Ugur Cansin; Cakmakci, Talip; Cakmakci, Ozlem; Sahin, Ustun
Search for raw materials, especially for those used in food production, gained further importance with the increasing world population. In recent years, aquaponic systems which integrated form of fish and plant cultivation were increasingly preferred in the search for new food sources. In this study, culture mediums in aquaponic and hydroponic systems were investigated for koi carps (Cyprinus carpio) and cucumber plants (Cucumis sativus). At the end of the study, nutrient element and chlorophyll contents with antioxidant enzyme activities of the plants grown in aquaponic and hydroponic systems were compared. The comparison between aquaponic and hydroponic systems showed that the differences between the systems in terms of Ca, Na and P were not statistically significant, while there was a statistically significant difference in K and Mg levels among the macro elements between the systems. Differences in microelements (B, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) were significant among systems. In the aquaponic system, Cd, Cr, Fe, Ni, Pb, and Zn levels were higher compared to those in the hydroponic system, while B, Cu and Mn levels were higher in the hydroponic system. There was no difference in antioxidant system activities (CAT, APX, MDA, SOD) in both systems. The difference between the systems in terms of chlorophyll content was significant, and chlorophyll content in the hydroponic system was higher than that in the aquaponic system.
The Effect of Feed Made From Fish Processing Waste Silage on the Growth of Rainbow Trout (Oncorhynchus Mykiss)
(Academic Journals, 2011) Guzel, Senol; Yazlak, Hasan; Gullu, Kenan; Ozturk, Ekrem
This study researched the degree to which the growth of rainbow trout (Oncorhynchus mykiss) was influenced by pellet feed made from silage produced from waste generated by the fish food processing industry. During the 90 day trial, a completely random parcel method was used with three repetitions. The average weight of the rainbow trout was 54.05 +/- 235 g, while their average length was 17.46 +/- 0.11 cm. One hundred (100) trout were stocked (25 kg/m(3)) in each fiberglass fish feeding tank. Four different experimental groups were formed; feed without silage (control) and pellets with 25, 50 and 100% silage. Fish were fed twice per a day until they were satisfied (ad libitum). At the end of the study, the group that was fed with feed made from 50% silage increased the most in weight, followed by the control group and the groups fed with 25 and 100% silage, respectively. The average weight differences between the groups were found to be significant (P<0.05). In conclusion, it can be said that replacing the fish meal in food used to feed trout with 50% fish silage has a positive effect on growth, and that silage can be used in trout food at the aforementioned ratio.
The Effects of 17α-Methyltestosterone on Chemical Composition, Fillet Efficiency, Visceral Fat and Hepatosomatic Index of Rainbow Trout, Oncorhynchus Mykiss
(Ege Univ, 2006) Guzel, Senol; Gullu, Kenan
The 17 alpha-Methyltestosterone treats carried out in two periods. The Rainbow trout fingerlings (6.43 +/- 0.31 g.) were fed 2.5 and 5 mg/kg MT in first period, lasted 92 days. 2.5 mg/kg MT in second period lasted 96 days. Generally in the this study, 17 alpha-MT was treated 2.5 mgMT/kg-diet, throughout 92 days, and 188 days and 5 mgMT/kg-diet, throughout 92 days to rainbow trout. The group of 2.5 mgMT/kg-diet was separate two groups and then one of them was fed with 2.5 mgMT/kg-diet go on in the second period, lasted 96 days. Other group was fed with control food. Normal feed without MT was given to the control fishes. As a consequence of the analysis, it was found out that MT does not cause a change in the crude protein and crude ash (p>0.05), however it increased the values of the crude fat and decreased the value of moisture (p<0.05) of fish-meat. It not effected the fillet efficiency (p>0.05), however it effected percent of internal organ and visceral fat content and HSI (p<0.05). In the fish, treated 2.5 mg MT/kg-diet, throughout 188 days, visceral fat and percent of internal organ were decreased.
Effects of Different Feeding Strategies on the Growth of Young Rainbow Trout (Oncorhynchus Mykiss)
(Academic Journals, 2011) Guzel, Senol; Arvas, Abdullah
This study investigated the effects of different feeding strategies on the growth, conditions and food conversion rate of young rainbow trout (Oncorhynchus mykiss). The groups set up are as follows: a control group (Gc), which was fed every day for the week, a group with no feeding on Monday and Thursday (G(Mon-Thu)), a group with no feeding on Saturday and Sunday (G(Sat-Sun)), and a group that alternated feeding one day and no feeding the next (G(F-NF)). At the end of the study, the mean (+/-SD) weight and food conversion ratio of groups were found to be: 83.51 +/- 5.43 g and 1.09; 87.38 +/- 5.95 g and 1.14; 83.50 +/- 5.97 g and 1.15; and 76.66 +/- 4.56 g and 1.26, respectively. Group G(F-NF) showed significantly slower growth than the others, and it exhibited a higher food conversion ratio value than groups G(Mon-Thu) and G(Sat-Sun) (P<0.05). The condition factors of the groups were similar (P>0.05). This study showed that the two groups that did not feed for two days a week (G(Mon-Thu) and G(Sat-Sun)) did not exhibit negative growth performance, whether they were not fed on consecutive days or different days of the week, while group G(F-NF) exhibited negative growth performance.
The Effects of Estradiol Valerate on Body Composition, Carcass, Viscera, Gonado and Hepatosomatic Indexes of Rainbow Trout, Oncorhynchus Mykiss
(Medwell online, 2008) Gullu, Kenan; Guzel, Senol; Ekici, Kamil
Mono-sexual trout breeding through the use of steroids is derived from the fact that female trout grow faster than males and have meat of better quality and higher carcass efficiency. Treating male trout with estradiol results a phenotypical change of sex, leading to decreased weight of viscera. Some steroid compounds can lead to different results in body development and composition of various kinds of fish. In this study the effects of oral administration of 20 mg of estradiol valerate per kilogram of administered diet were studied in 35-day-old rainbow trout. The protein, fat, ash and Moisture contents of fish-meat, carcass and fillets percentages and the hepato-and gonadosomatic indexes were measured as well as the amount of residual estradiol valerate or metabolite that might have remained in fish-meat. Compared to control, there were no changes in moisture, protein, fat and ash contents of fish-meat and in the fillet percentage of the trout. The mass percentage of viscera and the gonado-and hepatosomatic indexes decreased while the carcass percentage increased. No residual estradiol valerate or metabolite was found in the meat of treated trout more than control trout.
Effects of Oral Administration of Estradiol Valerate on Gonadal Sex Differentiation in the Rainbow Trout, Oncorhynchus Mykiss
(Medwell online, 2008) Guzel, Senol; Yoruk, Mecit; Gullu, Kenan; Karaca, Turan
This study investigated the effects of administering Estradiol Valerate (E2V) on gonadal sex differentiation in rainbow trout (Oncorhynchus mykiss, W., 1792). Rainbow trout fry of average weight 0.32 +/- 0.02 g, 65 days post fertilization (dpf), which had just started to feed were supplied with a feed containing E2V at a rate of 20 mg kg(-1) for 8 weeks (65-121 dpf). Fish samples were taken at random at 156 days (dpf,), 170, 191, 226 and 261 days and changes in fish gonads were analyzed histologically. At 156 dpf of the experiment, it was observed that oocyte formation had started in the fish gonads, suggesting feminization by the administration of the estradiol valerate. Intersex fish were observed at 170 dpf, while oocytes had gathered heads in gonads and sex transformation of some individuals had started at 191 dpf. Oocytes occupied the large areas of gonads and spermatogonia disappeared at 226 dpf as at 261 dpf. At the end of the experiment, sex compositions were 97% female, 3% intersex in the E2V administration group and 51% female, 49% female in the control group. There were no apparent differences between control group fish and hormone-treated fish as regards oocyte size.
Fecundity and Egg Size of Three Salmonid Species (Oncorhynchus Mykiss, Salmo Labrax, Salvelinus Fontinalis) Cultured at the Same Farm Condition in North-Eastern, Turkey
(Medwell online, 2010) Serezli, Ramazan; Guzel, Senol; Kocabas, Mehmet
In this study, fecundity and egg size of rainbow trout (Oncorhynchus mykiss), Black Sea trout (Salmo labrax) and brook trout (Salvelinus fontinalis) were examined. Two and six years old female fish reared in commercial fish farm were used and the female size, total and relative fecundity and egg size (mm) were determined for the broodstock fish of three tested species. The average weights of broodfish of rainbow trout, Black Sea trout and brook trout 1.357.27+/-406, 532+/-673.7 and 310.40+/-85.0 g, respectively. The total fecundity (number of eggs fish(-1)) was 2.809+/-791, 1.401+/-1374 and 723+/-320, the relative fecundity (number of eggs kg(-1) fish) was 2.180+/-676, 3.558+/-1307 and 2.571+/-1530 and the egg size (mm); 4.95+/-0.2, 4.51+/-0.67 and 4.49+/-0.21 were determined for rainbow trout, Black Sea trout and brook trout, respectively. A significant linear relationship was found total fecundity and the post-stripped fish weight of Black Sea trout (r = 0.96), but this relationship was low for the rainbow trout (r = 0.28) and brook trout (r = 0.17). A negative relationship was observed between the relative fecundity and brood size in rainbow trout (r = 0.57), Black Sea trout (r = 0.58) and brook trout (r = 0.54). A significant linear relationship was observed in rainbow trout (r = 0.63), Black Sea trout (r = 0.86) and brook trout (r = 0.41) (p<0.01).
Oestradiol Valerate on the Growth and Sex Reversal in Rainbow Trout
(indian veterinary Journal, 2007) Gullu, Kenan; Guzel, Senol; Guner, Yusuf
Monosex female population can be obtained by the application of exogenous oestrogen such as oestradiol (E-2). Steroids can also be applied in anabolic purposes. However, there was no account, of applications of oestradiol valerate (E2V) in fish studies. This study was performed to describe the direct E2V application in sex reversal to produce all female population and its effect on the growth and survival rate of rainbow trout, Oncorhynchus mykiss.
Producing Silage From the Industrial Waste of Fisheries
(Foundation Environmental Protection & Research-fepr, 2015) Gullu, Kenan; Guzel, Senol; Tezel, Rifat
The aim of this study was to highlight the potential economic benefits of fisheries industrial waste silage by the dint of its ability to be recycled efficiently in animal feed. Fish silage was produced by acid hydrolysis. The fish silage was ripened and became half-liquid, at room temperature in 12 days. Its odour became less pungent and was deemed to have an acceptable malt smell. The silage cost was found to be 0.72 TL/kg. The results of this study established that, the use of silage instead of fish meal, reduces the cost of feed by 21%. Therefore fish waste products, previously considered as a refuse and causing environmental pollution, can be reintegrated into the economy.