Erkan Can

Izmir Katip Celebi, Faculty Of Fisheries, Faculty Member

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Papers by Erkan Can

Effects of kefir supplementation on body antioxidant-systems, haemolymph heat-shock protein 70 and trypsin, in the crayfish Astacus leptodactylus Eschscholtz (Decapoda, Astacidea)

Crustaceana, Nov 18, 2022

This study was designed to investigate the effects of dietary kefir on trypsin, heat shock protei... more This study was designed to investigate the effects of dietary kefir on trypsin, heat shock protein 70 (HSP70) as well as the oxidant and antioxidant status of the freshwater crayfish, Astacus leptodactylus. The experiment was performed with the four following treatments: Control group, D1, D2 and D3 (kefir supplemented diet 2, 4, 8 g/kg of crayfish body mass, respectively). Crayfish were stocked into 12 fibreglass tanks (three replicates per treatment) and fed for 45 days. Reduced glutathione (GSH), glutathione peroxidase (GSH-Px), malondialdehyde (MDA) and catalase (CAT) in hepatopancreas and muscle were analysed to determine the status of the oxidant/antioxidant balance. In addition, HSP70 and trypsin were measured in haemolymph. Our results indicated that the activity of GSH-Px, MDA and GSH levels decreased in hepatopancreas () and muscle tissues () with increasing kefir concentration, while CAT activity increased (). Trypsin and HSP70 insignificantly decreased in haemolymph.

Biochemical Taste Parameters in Meat and Sea Products

Journal of Animal and Veterinary Advances, Dec 1, 2010

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Selected topics in sustainable aquaculture research: Current and future focus

Zenodo (CERN European Organization for Nuclear Research), Aug 31, 2022

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Gökkuşağı Alabalığı (Oncorhynchus mykiss) Juvenillerinin Anestezisinde Karanfil (Eugenia caryophyllus), Okaliptüs (Eucalyptus citriodora) ve Melisa (Melisa officinalis) Esansiyel Yağlarının Etkin Konsantrasyonlarının Belirlenmesi

International Journal of Pure and Applied Sciences

Su ürünleri yetiştiriciliğinde 2-fenoksietanol, MS-222 ve benzokain gibi sentetik anestetikler ya... more Su ürünleri yetiştiriciliğinde 2-fenoksietanol, MS-222 ve benzokain gibi sentetik anestetikler yaygın olarak kullanılmaktadır. Amerika ve İngiltere'de yemeklik balıklarda kullanılmasına yasal olarak izin verilen tek anestetik madde MS-222’dir. İlaç ve Gıda Örgütü (FDA) tarafından MS-222’nin balık vücudundan atılma süresi su sıcaklığına göre farklılık göstermekle birlikte ortalama 21 gün olarak belirtilmiştir. Bu da balıkların pazarlanmasında gecikme yaşanmasına neden olmaktadır. Yapılan araştırmalarda karanfil (Eugenia caryophyllus) esansiyel yağının (KEY) anestetik etkileri üzerine birçok çalışma gerçekleştirildiği görülmektedir. Bununla birlikte, son yıllarda okaliptüs (Eucalyptus citriodora) esansiyel yağı (OEY) ve melisa (Melisa officinalis) esansiyel yağının (MEY) anestetik etkileri hakkında birkaç çalışmanın olduğu görülmüştür. Bu çalışmada, KEY (Kontrol); 25, 37,5, 50 µl L-1, OEY; 300, 350, 400 µl L-1 ve MEY; 200, 300, 400 µl L-1 olarak üçer farklı konsantrasyonda kullanı...

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Munzur alabalığı (Salmo munzuricus)’nın kapalı devre yetiştiricilik sisteminde gelişimi ve antioksidan enzim aktivitelerinin belirlenmesi

DergiPark (Istanbul University), Jun 25, 2022

In the study, a recirculating aquaculture system (RAS) was established, which is becoming widespr... more In the study, a recirculating aquaculture system (RAS) was established, which is becoming widespread as much as it is in the production of marine fish in trout production today. The development and antioxidant enzyme activities of the juvenile fish hatched from the eggs taken from the broodstocks obtained from Munzur Stream were investigated. The trout fries (0.5±0.13 g) were stocked in 8 fiberglass tanks in the recirculating aquaculture system established within the scope of the project and fed for 120 days. The development parameters were recorded on a monthly basis. Then, at the 90th and 120th days, tissue samples were taken from the gill, liver and muscles to determine the oxidant and antioxidant balance, glutathione (GSH) and malondialdehyde (MDA) levels, superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and catalase. (CAT) activities were analyzed. At the end of the study, the MDA concentration and GSH level were found to be highest in the gills. It was determined that there were differences between GSH-Px and CAT activities in muscle tissues (p<0.05). SOD activity showed a significant increase in muscle compared to other organs. The data obtained as a result of the study is also a source for studies to be carried out on the conservation of Munzur trout, whose numbers are decreasing day by day, within the scope of biodiversity, and for commercial studies.

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Probiotik ürünlerin levrek (Dicentrarchus labrax, L. 1758) larvalarının gelişimine katkısı

Bu çalışmada, yoğun (intensif) balık üretimi yapılan kuluçkahanelerde, balıkların ilk üretim safh... more Bu çalışmada, yoğun (intensif) balık üretimi yapılan kuluçkahanelerde, balıkların ilk üretim safhalarında ortaya çıkan geniş populasyonlardaki patojen mikroorganizmalarla doğal metotlarla mücadele olanakları araştırılarak, probiotik bakteriler ve nütrientlerden oluşan ürünlerin üretim kalitesine, miktarına ve larval gelişime etkisi incelenmiştir.Deneme, ticari olarak piyasada satışa sunulan ve bazı faydalı bakteriler ve nütrientler içeren bir ürün (PROBİOTEL) ile yapılmıştır.Probiotel, levrek larvalarının ilk beslemesinde canlı yem olarak kullanılan artemia ekim tanklarının suyuna 15 mg/lt, zenginleştirme tanklarının suyuna 8 mg/lt olacak şekilde katılmıştır.Uygulama; ürünün (Probiotel) 2 farklı metotla larvalara verilmesi ile gerçekleştirilmiştir.Böylelikle 3 grup tank oluşturulmuştur.Bunlar: 1.Canlı yemle (Artemia sp.); Hem ekim tanklarının suyuna, hem de zenginleştirme tanklarının suyuna probiotik katılarak, 2.Canlı yemle (Artemia sp); ekim tanklarının suyuna probiotik katılarak,...

Nanotechnology Applicatıons in Aquaculture and Seafood Industries

Journal of materials science & engineering, 2011

Anesthetic Efficiency of 2-Phenoxyethanol on Broodstock of Salmo munzuricus , a New Trout Species Originating from Munzur Stream [ 1 ]

Salmo munzuricus is a newly-named species of trout that spreads through rivers flowing along the ... more Salmo munzuricus is a newly-named species of trout that spreads through rivers flowing along the Munzur Valley National Park. The efficacy of anaesthetic 2-phenoxyethanol was evaluated in indigenous brown trout in the present study. Fish were divided into three weight classes: 100-200 g (W1), 200-400 g (W2) and 400-600 g (W3) and they were exposed to four concentrations of anaesthetic (0.2, 0.3, 0.4 and 0.5 mL L-1). The lowest induction time was identified in the group W3 while the highest one was in the group W1. The lowest recovery time occurred after 73.2±3.83 sec in the group W3 and the highest one was 136±31.46 sec in the group W1. The recovery times were increased with increasing the concentration of 2-phenoxyethanol in the group W1. However, recovery times in the groups W2 and W3 were significantly longer than observed in W1, generally. Besides, it was indicated that fish size affected induction times and recovery times. As a result of the present study, the most appropriate ...

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Anesthetic Efficacy of Cymbopogon citratus Essential Oil as a Herbal Agent in Two Ornamental Fish Species

Israeli Journal of Aquaculture - Bamidgeh, 2018

The efficacy of Cymbopogon citratus essential oil (CcEO) as a herbal anesthetic agent was evaluat... more The efficacy of Cymbopogon citratus essential oil (CcEO) as a herbal anesthetic agent was evaluated for two ornamental fish species, Sciaenochromis fryeri and Labidochromis caeruleus. Fish were exposed to various essential oil concentrations and the lowest effective concentrations were determined according to deep anesthesia (AD<3 min) and full recovery (RF<10 min) times. CcEO showed anesthetic traits and induced AD in S. fryeri and L. caeruleus. The lowest effective concentrations was 200 μl/L for S. fryeri (AD; RF → 122 ± 1.8 s; 638 ± 8.9 s) and 200 μl/L for L. caeruleus (AD ; RF → 139 ± 6.9 s ; 625 ± 11.1 s). At concentration of 25 μl/L C. citratus essential oil did not induce AD in both of ornamental fish species. No significant differences were found between fish species in terms of induction and recovery times for same concentrations excluding AD time of 200 μl/L concentration. Although the fastest AD were obtained by 300 μl/L, recovery times were prolonged and fish did ...

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Alabalıklarda Probiyotik Uygulamalarının Bugünü ve Geleceği

Tatli su ve kismen deniz baliklari yetistiriciligindeki en onemli turlerden biri alabaliktir. Bu ... more Tatli su ve kismen deniz baliklari yetistiriciligindeki en onemli turlerden biri alabaliktir. Bu baligin yetistiricilik grafigi zamanla birlikte, surekli artis gostermektedir. Gunumuze kadar yapilan bircok arastirmada, surdurulebilirligin saglanmasinda, ekolojik yaklasimli doga dostu alternatif uretim yontemlerinin gelistirilmesi konusunda fikir birligine varilmistir. Probiyotik olarak kullanilan bazi secilmis uygun bakteriler bagirsak florasina yerlestiginde, gastrointestinal bolgedeki potansiyel patojenlerle mucadele ederek, tehlikeli gen ekspresyonlarini engelleyerek, immun sistemi ve mide morfolojisini gelistirerek, ayni zamanda sindirim fonksiyonlarini duzenleyerek konak canlilara fayda saglayan potansiyel alternatiflerdendir. Akuakultur uygulamalarinda kullanilan antibiyotiklerin ve kullanilan bazi kimyasallarin azaltilmasi bakimindan da bu alternatiflerin kullanimi bircok arastirici tarafindan onerilmistir. Bu nedenle, probiyotik uygulamalari, hastaliklara karsi direncin arti...

Comparison of nutrient contents of wild and farmed rainbow trout ( Oncorhynchus mykiss , Walbaum 1792) from Keban Dam Lake in Eastern Anatolia region of Turkey

Aquaculture Research, 2022

Seasonal variation in food preference of the brown trout Salmo trutta macrostigma (T., 1954) from Uzungöl Stream, Turkey

AFRICAN JOURNAL OF AGRICULTURAL RESEEARCH, 2012

The present study is aimed to provide information on the abundance of natural foods of Salmo trut... more The present study is aimed to provide information on the abundance of natural foods of Salmo trutta macrostigma (T., 1954). Fish were captured from Uzungöl Stream in Trabzon, Turkey between March 2009 and May 2010. It was investigated whether the dietary preferences of trout (S. t. macrostigma) change on account of seasons. Captured fish were measured 17.11 ± 4.65 cm (S.D.) (range 5 to 30 cm), 60.38 ± 48.52 g (S.D.) (range 2.34 to 250.84) (n = 163), respectively. The condition factor of trout calculated 1.00 ± 0.5 (S.D.) (range 0.57 to 1.58) (n = 163). The age range was between 0 and 8 years old. Stomach contents were analyzed using two methods, the frequency of occurrence and numerical method. A total of 11 prey groups were identified in the diets of brown trout living in Uzungöl Stream. Prey groups were consisted of Trichoptera,

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Nanotechnological Applications in Aquaculture-Seafood Industries and Adverse Effects of Nanoparticles on Environment

Archives of Materials Science and Engineering

Abstract: Nanotechnology has a wide usage potential in aquaculture and seafood industries. For in... more Abstract: Nanotechnology has a wide usage potential in aquaculture and seafood industries. For instance, production of more effective fish feed for aquaculture species by application of nanotechnology. According to the some studies, nanoparticles of elements like selenium, iron, etc. sources supplemented in diet could improve the growth of fish. New materials obtained by the nanosciences can be used in the different aspects of fisheries and aquaculture. The technology can be applied for use in aquariums and commercial fish ponds to reduce the cost of water treatment. Researchers believe that nanotechnology may have the potential to provide fishponds that are safe from disease and pollution. Another application possibility of nanotechnology is usage of different conservation and packaging techniques to provide seafood safety by delaying enzymatic and microbial spoilage. Nanofiltration and reverse osmosis processes is used to decrease salinity of drilling water which is used in seafoo...

Pagrus pagrus (L., 1758) Yumurtalarının Gluteraldehit ile Dezenfeksiyonu ve Embriyolojik Gelişimi

jfas.ege.edu.tr

... önem taşımaktadır. Deniz balığı kuluçkahanelerinde, balık sağlığı üretimin verimliliği açısın... more

Bioaccumulation of Copper and Zinc in Freshwater Crayfish (Astacus leptodactylus) Fed with Zebra Mussels (Dreissena polymorpha) Collected from Keban Dam Lake, Turkey

Asian Journal of Chemistry, 2013

This study is aimed to determine the bioaccumulation of copper and zinc in hemolymph of freshwate... more This study is aimed to determine the bioaccumulation of copper and zinc in hemolymph of freshwater crayfish (Astacus leptodactylus) fed with zebra mussel (Dreissena polymorpha) collected from Keban Dam Lake. This is the first study on bioaccumulation of Cu and Zn in hemolymph of males and females of A. leptodactylus. The average concentrations of Cu and Zn in the hemolymph samples were found out as 0.54 and 35.07 ppm respectively for male and 0.42 and 15.59 ppm respectively for female control freshwater crayfish. The levels of Zn in the hemolymph of both male and female ones among control and diet groups were statistically significant (P < 0.05). The Cu levels among control and diet groups in female ones were statistically significant (P < 0.05) but not in the male ones (P > 0.05). The results of current study revealed that feed treatment with boiling was not effective at the levels of metal bioaccumulation in hemolymph. It was observed that this metal bioaccumulation is more related with sex differences.

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First Results on Spawning and Larval Rearing of the Brown Meagre (Sciaena umbra)

Acta Natura et Scientia, 2021

The aim of the present study is to investigate spawning and larval rearing of brown meagre (Sciae... more The aim of the present study is to investigate spawning and larval rearing of brown meagre (Sciaena umbra). This is an important species in the Mediterranean Sea because of its beauty, calm swimming, large otoliths, souvenir potential, aggregative behaviour, excellent flesh and accessibility. Although this species is regarded as Near Threatened (in IUCN Red List Status), the demand increases the fishing. Green water technique was used for rearing the brown meagre larvae. Diameter of eggs was recorded as 1457.31±47.29 µm. Yolk was homogenous with oil globules of 371.59±18.15 µm at the centre. Hatching process began after 39 hours. Hatching rate (HR) was observed as 92.17±0.24%, and larvae inflated swim bladder around 97.33±0.94%. The brown meagre juveniles reached to 40.08±1.98 mm of total length (TL) with 10.96±0.08 mm body height (BH) and 662.27±21.23 mg body weight (BW) after 55 days of post-hatching. Survival (SR) was recorded as 72.5±0.70% at the end of study. Since the brown me...

Effects of Intensive and Semi-Intensive Rearing on Growth, Survival, and V-Shaped (Lordotic) Skeletal Deformities in Juvenile Gilthead Sea Bream (Sparus aurata)

Intensive production can reduce production costs and improve efficiency of larvae culture. This s... more Intensive production can reduce production costs and improve efficiency of larvae culture. This study compared the effects of intensive and semiintensive production on growth, survival, and V-shaped skeletal deformities in juvenile gilthead sea bream (Sparus aurata). At the end of the 50-day study, survival was 68.01±0.8%, mean weight was 1.32±0.03 g, and lordosis was 32% among juveniles raised in the intensive system. Survival and mean weight were significantly higher, 92.06±1.1% and 1.61±0.02 g, respectively, among juveniles raised in the semi-intensive system, and none had lordosis (p<0.05). Results suggest that semi-intensive systems are more advantageous than intensive for rearing sea bream juveniles. The IJA appears exclusively as a peer-reviewed on-line open-access journal at http://www.siamb.org.il. To read papers free of charge, please register online at registration form. Sale of IJA papers is strictly forbidden. Sale of IJA papers is strictly forbidden.

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The dietary nucleotide effect on the growth of sea bass (Dicentrarchus labrax L., 1758) larvae

Ege Journal of Fisheries and Aquatic Sciences, 2006

The dietary nucleotide effect on the growth of sea bass (Dicentrarchus labrax, L., 1758) larvae. ... more The dietary nucleotide effect on the growth of sea bass (Dicentrarchus labrax, L., 1758) larvae. In this study, it is investigated the dietary nucleotides (DNA and RNA) effects on the growth and survival rate of sea bass (Dicentrarchus labrax, L. 1758) at nursery and adaptation stage. The treatments had started day 40 of the larvae and finished the day 85, the effect on the growth of larvae of the product was observed up to day 100. As a result of this study, it was determined that if groups were applied dietary nucleotides are investigated from growth seeing. Length increase was no differences (p>0.05), but weight increase and survival rates were differences (p<0.05).

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Bazı dezenfektan maddelerin çipura (Sparus aurata), levrek (Dicentrarchus labrax), Sinarit (Dentex dentex) ve fangri (Pagrus pagrus) yumurtalarının dezenfeksiyonuna etkisi

Disinfection of Pagrus pagrus (L., 1758) eggs with glutaraldehyde and embriyological development

Erkan Can

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