Browsing by Author "Gullu, Kenan"

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Artificial Spawning and Feeding of European Catfish, Siluris Glanis L., in Turkey
(Medwell online, 2008) Gullu, Kenan; Guner, Yusuf; Koru, Edis; Tenekecioglu, Ersin; Saygi, Hulya
This study focused on spawning and larval rearing of European catfish, Silirus glanis L., under hatchery conditions in Turkey. It was carried out to establish traditional production method for artificial breeding of European catfish in Turkey. The aim of this study was to introduce European catfish to aquaculture sector of Turkey. In spite of having suitable climate and water conditions in many regions, the catfish has not been farmed in Turkey. According to sexes of the brood catfish were separated as male and female in different tanks as soon as they reached to their sexual maturity when water temperature was being raised to 20 degrees C. The Carp pituitary was injected to brook stocks at the rate of 3-4 mg kg(-1) body weight. Eggs which were fertilized by drying method were loaded in Zuger jars. Larvae were fed with egg yolk, zooplankton, chironomid larvae and tubifex in polyester tanks during one week. A portion of post larvae were stocked in polyester tanks and they were fed with carp food (containing 35% protein), at a rate of 2.5%-livefish weight for 1 month. The other portion of post larvae was released to earthen ponds, fertilized with organic and inorganic fertilizers, for 1 month+2.5 months (totally 105 days). The larvae, in the earthen ponds, were fed with carp food (containing 35% protein), at a rate of 2.5%-livefish weight. At the end of the study, survival rates were found as 79.5% for incubation, 76.2% for prelarvae, 56.4-77.1% for post larvae. Survival rates in earthen ponds were calculated as 13.4% for 1 month period and 9.4% for summer season (2.5 months). Survival rate for fish fed with tubifex and carp feed in polyester tank was found as 73.1% during one month. The weights were 1.55 +/- 0.16 g for earthen pond culture and 3.6 +/- 0.08 g for polyester tank culture at the end of 1 month trial period. The growth and survival rates between earthen pond and polyester tank culture were significantly different (p<0.05). The weight was calculated as 74.2 +/- 0.26 g in the earthen pond at the end of study (after 105 days). As a result, it will be more suitable for European catfish production that is carried our in controlled tanks for I month to be transferred into earthen or wide ponds. It is better to say, this study fulfills a requirement for the favor of Turkish Aquaculture sector which is to bring in this fish to our sector.
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.
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.
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.
Optimal Dietary Protein Levels in Juvenile Electric Blue Cichlid (Sciaenochromis Fryeri)
(Israeli Journal of Aquaculture-bamidgeh, 2008) Gullu, Kenan; Guroy, Derya; Ceiik, Ihsan; Tekinay, Ahmet Adem
A feeding trial was conducted to determine the dietary protein requirement of juvenile electric blue cichlids (Sciaenochromis fryeri). Groups of fish (0.50 +/- 0.01 g) were fed one of four isocaloric diets containing protein levels ranging 35-50% for 12 weeks. According to the broken-line model, the dietary protein requirement was estimated as 38.8%. The feed conversion ratio ranged from 1.73 in the 50%-protein group to 2.16 in the 35% group. There were statistically significantly differences in feed intake and protein efficiency ratio. In general, the protein efficiency ratio decreased as the dietary protein level increased. For optimum growth, feed conversion, and protein utilization, a diet containing 39-40% protein, 11% crude lipid, and 20.7 MJ gross energy/kg diet is recommended for juvenile S. fryeri.
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.