Ercument Genc | Ankara University (original) (raw)

Papers by Ercument Genc

Marine and life sciences, Dec 20, 2022

Symbiotic effect of Bacillus clausii and Galacto-oligosaccharide on growth and survival rates in ... more Symbiotic effect of Bacillus clausii and Galacto-oligosaccharide on growth and survival rates in red cherry shrimp (Neocaridina davidi)

Turkish Journal of Fisheries and Aquatic Sciences, May 21, 2019

Despite the potential importance of parasitic nematode, Anguillicoloides crassus for the survival... more Despite the potential importance of parasitic nematode, Anguillicoloides crassus for the survival of eel, only a few studies have addressed this issue on eel stocks of Turkey. The current study reports baseline data on prevalence of parasites and pathological status in naturally infected eels from three important river estuaries (Seyhan River, Göksu River and Manavgat River) in Turkey. In total, 70 individuals of Anguilla anguilla from three river estuaries were examined and 46 (65.7%) specimens were infected by Anguillicoloides crassus. The nematodes were easily observed together with the excessive hemorrhagic exudate in the swimbladder. The swimbladder of eels were also pathologically examined. The uninfected swimbladder samples were grossly thin and shiny but in infected cases the tissues were detected as opaque, thick, hyperemic and mostly hemorrhagic. Histopathological examination revealed that focal to diffuse inflammation, marked hemorrhagies, erosive-ulcerative changes at the mucosa, edema and hyperemia at the submucosa. In severe cases muscularis mucosa were also affected.

Acta Biologica Turcica, Dec 7, 2017

In this study the infection status of swimbladder nematode Anguillicoloides crassus in European e... more In this study the infection status of swimbladder nematode Anguillicoloides crassus in European eel (Anguilla anguilla) was evaluated for the northeast Mediterranean Region of Turkey. 170 fresh European eel samples were obtained from the four different river side fish markets (whilst processing stage) as follows 45 from Goksu River (G), 42 from Seyhan River (S), 42 from Ceyhan River (C), and 41 from Asi River (A) in two times during a period of 3 years. The number of infected eels (Ni), prevalence (P%), parasite abundance (A), and mean intensity (MI) values were calculated according to the sampled period/locations. The prevalence, parasite abundance, and mean intensity values of parasites were higher Asi River than others.

Ege Journal of Fisheries and Aquatic Sciences, Mar 1, 2006

Effects of dietary Mannan-oligosaccharide on growth, intestine and liver histology of the African... more Effects of dietary Mannan-oligosaccharide on growth, intestine and liver histology of the African catfish (Clarias gariepinus (Burchell, 1822)). Different levels of dietary mannan-oligosaccharide (MOS) administered for 80 days to African catfish (Clarias gariepinus) were evaluated for their efficacy on growth parameters, and intestine and liver histology. The following levels of MOS were used in commercial trout diet: 1‰, 2‰ and 3‰ during the trial. At the end of the feeding period the live body weight gain and feed conversion ratio, hepatosomatic and gonadosomatic index values were found similar for all experimental groups (P>0.05). Also, dietary MOS did not significantly affect the liver and intestine histology.

Journal of survey in fisheries sciences, Feb 1, 2021

Türkiye Biyoetik Dergisi, 2020

Covid-19 pandemisinin küresel etkileri insanoğlunun normalini bozmuştur. Bu olağanüstü rutinden u... more Covid-19 pandemisinin küresel etkileri insanoğlunun normalini bozmuştur. Bu olağanüstü rutinden uzaklaşma döneminde; tarım ve gıda sektörü oldukça hassas ve stratejik bir konuma ulaşmıştır. Güvenli gıda üretimi ve tüketiminin sağlanması için üreticiden tüketiciye uzanan tedarik zincirinin aksamaması gerektiği anlaşılmıştır. Tarım ve gıda sektöründe Covid-19'un etkileri; hastalık ve bulaşma riskini en az seviyede tutabilmek adına uygulanan hijyen ve sanitasyon kurallarının arttırılması sonucunda pazar talebinin düşmesiyle kendini göstermiştir. Tarımın sularda yürütülen kısmını oluşturan su ürünleri yetiştiriciliği ve hatta avcılığı da bu küresel krizden doğrudan zarar görmüştür. Sağlıklı olmak ve yaşamsal faaliyetleri devam ettirmek için tüketime sunulan gıda maddeleri arasında biyolojik değeri yüksek protein ve yağ içeren sucul hayvansal organizmaların birincil düzeyde önem taşıyan stratejik ürünler oldukları bilimsel olarak ispatlanmıştır. Artan dünya nüfusunun nitelikli besin kaynağına erişiminin sınırlandırılmasının yaratacağı katastrofik etkiler göz önüne alınarak su ürünleri üretiminin sürdürülebilirliğinin tarım sektörü içinde bütüncül bir yaklaşımla ele alınarak geliştirilmesi gerekmektedir. Covid-19 süreci insanlığa gıda etiği ve güvencesinin ancak sorumlu yetiştiricilik uygulamaları ile mümkün olabileceğini öğretmiştir. Bu derleme ile Covid-19 salgınının su ürünleri alanına olan etkileri küresel ve yerel kaynaklardan edinilen bilgiler ve öngörülerimiz çerçevesinde sunulmuştur.

Fifteen African sharptooth catfish (Clarias gariepinus Burchell, 1822) were collected from the Ri... more Fifteen African sharptooth catfish (Clarias gariepinus Burchell, 1822) were collected from the River Asi (River Orontes) in Antakya (Hatay, Turkey) in November 2007, and fish blood samples were examined for the presence of blood parasites. The existence of infection with Trypanosoma (hemoparasite) was identified in 13 out of the 15 fish specimens. Currently there are no records of the presence of any species of Trypanosoma infecting Clarias gariepinus in Anatolia. Thus this study is the first report of Trypanosoma sp. infections in Clarias gariepinus in Turkey.Asi Nehri’nden Kasım 2007’de elde edilen 15 adet karabalık, kan paraziti varlığı yönünden incelenmiştir. 15 balığın 13 adedinde hemoparazit Trypanosoma sp. varlığına rastlanılmıştır. Anadolu’dan Clarias gariepinus için Trypanosoma enfeksiyonu daha önce bildirilmediğinden, bu çalışma ile ilk kez Asi Nehri karabalıklarında Trypanosoma sp.’nin varlığı bildirilmiştir

3rd International Congress on Advances in Bioscience and Biotechnology (ICABB), Kiev, Ukraine, 10-14 July 2019. Book of Proceedings, 2019

Turkish Journal of Bioethics, 2020

Journal of Applied Aquaculture, 2020

The present study aimed to evaluate the possible effects of a natural hepatomodulator on growth; ... more The present study aimed to evaluate the possible effects of a natural hepatomodulator on growth; some biological, blood, and color parameters; body; cost analysis; and liver histology of rainbow trout. A commercial rainbow trout diet was used for the control group, and 500 mg kg −1 of commercial additive was used for the treatment group. The experiment was carried out for 12 weeks. At the end of the experiment, there was no significant effect on growth or biological and some blood parameters (P > 0.05); however, significant skin brightness changes (P < .05) were observed on the fish. Also, liver sections of the fish fed with the control diet showed a high proportion of lipid accumulation on hepatic parenchyma compared to fish that were fed treated diets. These results showed that application of commercial artichoke extract to rainbow trout diets might have positive effects on outer skin colorization and liver fat accumulation.

Ege Journal of Fisheries and Aquatic Sciences, Dec 15, 2017

Ege Journal of Fisheries and Aquatic Sciences, Jun 15, 2018

Aquaculture Research, Oct 27, 2022

Acta aquatica turcica, Mar 1, 2022

In this study, it was aimed to evaluate the effectiveness of different levels of thyme leaf and t... more In this study, it was aimed to evaluate the effectiveness of different levels of thyme leaf and thyme oil as feed additives in white shrimp (Litopenaeus vannamei) culture. In the experiment, five groups were formed as 1% and 2% thyme leaves (ThyL1% and ThyL2%), 0.5% and 1% thyme oil (ThyO0.5% and ThyO1%), and control group. Shrimps (6.67±1.52 g) were stocked at a stocking rate of 15 shrimp/250 L (100% water change day-1) in a three-replications. At the end of the trial, the highest final body weight (14.90±2.77) and weight gain (8.22±0.72) were determined in the ThyO1% group and were statistically different compared to the control group (Final weight: 13.54±3.37, weight gain: 6.87±0.54) (p<0.05). While the best feed conversion ratio between the groups was similarly determined in the ThyO1% (2.59±0.92) group, there was no difference between the groups in terms of survival rates. Histological examination of hepatopancreatic tissues showed no difference in tissue morphology between the groups. Dry matter, crude protein, and crude ash contents did not differ significantly between the groups. The highest lipid content was found in the ThyO1% group (1.64) compared to the other groups (p<0.05). Saturated and unsaturated fatty acids composition values differed significantly for all groups. (p<0.05). As a result, it can be stated that 1% thyme oil added feed can be used as a growth promoter in white shrimp culture. Keywords  Aromatic plants  fatty acids  histology  nutrition  shrimp Özet: The Bu çalışmada, beyaz karides (Litopenaeus vannamei) yetiştiriciliğinde yem katkı maddesi olarak kekik yaprağı ve kekik yağının farklı besin takviyesi düzeylerinin etkinliğinin değerlendirilmesi amaçlanmıştır. Denemede, %1 ve %2 kekik yaprağı (ThyL1% ve ThyL2%), %0,5 ve %1 kekik yağı (ThyO0.5% ve ThyO1%) ve kontrol grubu olmak üzere beş grup oluşturulmuştur. Karidesler (6,67±1,52 g), üç tekerrürlü deneme düzeninde stoklama oranı 15 karides/250 L (günlük %100 su değişimi) olacak şekilde stoklanmıştır. Deneme sonunda, en yüksek final vücut ağırlığı (14,90±2,77) ve ağırlık artışı (8,22±0,72) ThyO1% grubunda belirlenmiş ve kontrol grubu (Final ağırlık: 13,54±3.37, ağırlık artışı: 6.87±0.54) ile karşılaştırıldığında istatistiksel olarak farklı bulunmuştur (p<0.05). Gruplar arasında en iyi yemden değerlendirme oranı benzer şekilde ThyO1% (2,59±0,92) grubunda belirlenirken, yaşama oranları bakımından gruplar arasında fark bulunmamıştır. Hepatopankreas dokularının histolojik incelemesi, Anahtar kelimeler  Aromatik bitkiler  yağ asitleri  histoloji  beslenme  karides

e-Journal of New World Sciences Academy, Apr 30, 2020

In this study, Mediterranean mussels (Mytilus galloprovincialis Lamarck, 1819) were collected fro... more In this study, Mediterranean mussels (Mytilus galloprovincialis Lamarck, 1819) were collected from the most important mussel distribution/fishing areas in Turkish coastal waters (Çanakkale, Balıkesir, İzmir). The presence of parasite was investigated based on molecular methods. Molecular identification of parasite species was established by designing parasite-specific primers for PCR amplification and resulting nucleotide sequences were analysed. As a result of this study, four parasite species were identified as Mytilicola intestinalis Steuer 1902, Mytilicola orientalis Mori 1935, Urastoma cyprinae Graff 1882, Parvatrema duboisi Dollfus 1923 respectively. All identified species were found in İzmir (Agean Sea) specimens while Urastoma cyprinae and Parvatrema duboisi were found only in Çanakkale (Dardanelle) and Balikesir (Marmara Sea) specimens. Nucleotide composition, pairwise genetic distance and phylogenetic trees of the detected species were given. This research takes place to be the first study on identifying mussel parasites by using molecular techniques. Also, Mytilicola orientalis is the first record from Turkish coastal waters.

Bu calismada Turkiye’nin onemli av sahalarindan toplanarak balik hallerinde canli olarak satisa s... more Bu calismada Turkiye’nin onemli av sahalarindan toplanarak balik hallerinde canli olarak satisa sunulan 480 adet Akdeniz midyesi (Mytilus galloprovincialis Lamarck, 1819) (Canakkale, Erdek-Balikesir ve Izmir), parazit varligi yonunden histolojik ve molekuler yontemler kullanilarak incelenmistir. Histolojik kesitler uzerinden yapilan degerlendirmede dokularda parazitten kaynakli degisimler belirlenmistir. Molekuler yontem kullanilarak yapilan arastirmada, tasarlanan primerler ile kurulan PCR amplifikasyonlarindan elde edilen bantlar degerlendirilmistir. Bu degerlendirmeler sonucunda kopepod Mytilicola intestinalis (Steuer 1902) ve Mytilicola orientalis (Mori 1935), turbellarian Urastoma cyprinae (Graff 1882) ve trematod Parvatrema duboisi (Dollfus 1923) turleri tespit edilmistir. Izmir orneklerinden bu parazit turlerinin tamami teshis edilmis, Mytilicola turleri disindaki turler ise (Urastoma cyprinae ve Parvatrema duboisi) Erdek ve Canakkale orneklerinden tanimlanmistir. Tespit edilen dort turun cogaltilan bolgelerinin nukleotid kompozisyonu, genetik uzaklik matrisi ile filogenetik agaclari verilmistir. Molekuler analiz sonucu bu proje calismasi ile elde edilen turlerden Mytilicola intestinalis ve Mytilicola orientalis, ulkemiz sularindaki Akdeniz midyesinden ilk kayit ozelligini tasimaktadir.AbstractIn this study Meditarrenean mussels (Mytilus galloprovincialis Lamarck, 1819) were collected live from the most important mussel distrubition areas in Turkish coastal waters (Canakkale, Erdek-Balikesir, Izmir). The presence of parasite was investigated based on histological and molecular methods. Histologic sections set out in the tissues of the parasite induced changes in the assesment. In the detection using molecular methods established by designing primers for PCR amplification tape obtained was evaluated. As a result of this evaluation 4 species (Mytilicola intestinalis Steuer 1902, Mytilicola Orientalis Mori 1935, Urastoma cyprinae Graff 1882, Parvatrema duboisi Dollfus 1923) were identified. All of those 4 species were found in Izmir. Only Urastoma cyprinae and Parvatrema duboisi species were found in Canakkale and Erdek speciments. Nucleotide composition, pairwise genetic distance and phylogenetic trees of four detected species were given. The parasites that were found from these molecular investigations were the first records from Turkish coastal waters.

Acta aquatica turcica, Dec 1, 2021

The use of biofloc technology (BFT) in narrow-clawed crayfish (Astacus leptodactylus) culture for... more The use of biofloc technology (BFT) in narrow-clawed crayfish (Astacus leptodactylus) culture for 45 days was evaluated by production performance and physiological status of crayfish. Four different stocking densities of crayfish were tested in BFT (20, 41.66, 62.5, and 83.33 individuals m-2). Water quality parameters were monitored to sustain desired levels for crayfish and biofloc management. The growth performance of narrow-clawed crayfish did not show any significant differences among the groups. However, the survival rate changed by the stocking density. Hemolymph indices represented by total hemocyte counts and relative abundance of hyalinocyte, semi-granulocyte, and granulocyte were not affected by different stocking densities. Overall hemolymph glucose and lactate levels of narrow-clawed crayfish reflected mild stress in response to BFT conditions. Hemolymph protein concentrations did not change by the stocking ratio in BFT. Hemolymph protein levels were in the normal range, indicating the healthy status of the individuals. The hepatopancreas histology was observed as a typical morphology for healthy crayfish in all stocking densities in BFT. Notwithstanding the relatively lower survival rate in higher stocking density of narrow-clawed crayfish, the results of the present research revealed that the adaptation of narrow-clawed crayfish to BFT conditions is promising for the crayfish culture.