Sürdürülebilir Kalkınma Amaçları

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Yazarlar

• Aksu, Onder(4)
• Danabas, Durali(3)
• Yildirim, Numan(3)
• Aksu, O.(2)
• Aksu, Önder(2)
• Benzer, Fulya(2)
• Can, Erkan(2)
• Demirol, Ferhat(2)
• Yildirim, Nuran Cikcikoglu(2)
• Aydin, Hamdi(1)
• Barim-Oz, O.(1)
• Barim-Oz, Ozden(1)
• Bektas, Zubeyde Hanoi(1)
• Benzer, F.(1)
• Capkin, Kadir(1)
• Cilbiz, Mehmet(1)
• Danabas, Seval(1)
• Demir, Veysel(1)
• Duran, Tuba Cakmak(1)
• Erisir, M.(1)
• Erişir, Mine(1)
• Fatih Efendioğlu(1)
• Gulec, Azime Kucukgul(1)
• Gunduz, Fatih(1)
• Gökmen, Gökhan(1)
• Gündogdu, Hande(1)
• Gündüz, Fatih(1)
• Harlioglu, Ayse Gul(1)
• Harlioglu, M. M.(1)
• Harlioglu, Muzaffer M.(1)
• Harlioglu, Muzaffer Mustafa(1)
• Jussila, Japo(1)
• Kandemir, F. M.(1)
• Karimpour, M.(1)
• Kayim, Murathan(1)
• Kocabas, Mehmet(1)
• Kocabaş, Mehmet(1)
• Kokko, Harri(1)
• Kutluyer, Filiz(1)
• Köprücü, Kenan(1)

• Yüksek Lisans TeziAçık Erişim2022/r/munzur/7227
  Tunceli sarımsağı (Allium tuncelianum Kollman) masere yağlarının yoğun stoklanmış Astacus leptodactylus Eschscholtz, 1823'da antioksidan parametrelere etkisi

  Fatih Efendioğlu

  Bu çalışmada da Tunceli sarımsağının (Allium tuncelianum Kollman) yoğunluk stresi altındaki kerevitler üzerinde (Astacus leptodactylus) antioksidan etkisinin incelenmesi amaç edinilmiştir. Kas analiz sonuçlarında iki deneme grubuda birbirine çok yakın D1 23,176±0,112 U/ml ve D2 23,384±0,370 U/ml rakamsal değerlerde bulundu. Kontrol grubunun değeri ise 21,056±0,209 U/ml rakamsal olarak daha düşük seviyelerde bulundu. İki deneme grubu arasında istatistiksel bir farklılık bulunmazken (P>0,05), deneme grupları ile kontrol grubu arasında anlamlı bir fark vardı (P<0,05). Hepatopankreas analiz sonuçlarında da kasta elde edilen değerlerde olduğu gibi, deneme grupları arasında rakamsal olarak birbirine yakın (D1 30,804±0,110 ve D2 30,502±0,757U/ml), kontrol grubu daha düşük değerde (26,422±0,600 U/ml) tespit edildi. Gene kas grubunda olduğu gibi deneme grupları arasında istatistiki fark yoktu (P>0,05) fakat deneme grupları ile aralarındaki fark anlamlıydı (P<0,05). Katalaz (CAT) analizleri de kasda ve hepatopankreasda ayrı ayrı yapıldı. Kas analiz sonuçlarında deneme grupları sonuçlarının birbirine rakamsal olarak çok yakın olduğu (D1; 15,556±0,349 ve D2; 15,266±0,178 nmol/dk/m), kontrol grubu değerinin (16,268±0,722 nmol/dk/m) ise daha yüksek olduğu gözlemlendi. Bununla birlikte gruplar arasındaki istatistiksel olarak bir fark bulunmadı (P>0,05). Hepatopankreas analiz sonuçlarında da hem kontrol ve hemde deneme grupları rakamsal olarak birbirine çok yakın (K; 23,694±0,455 nmol/dk/m, D1; 23,296±0,383 nmol/dk/m ve D2; 22,822±0,419 nmol/dk/m) olarak bulundu ve aralarında istatistiksel olarak da bir fark tespit edilmedi (P>0,05). Glutatyon peroksidaz sonuçları SOD sonuçlarına benzer bir durum sergilemiştir. Kas analiz sonuçlarına bakıldığında, deneme gruplarının rakamsal olarak kontrol grubundan (K; 6,728±0,403 U/mg) daha yüksek ve birbirine çok yakın olduğu (D1; 8,560±0,167 U/mg ve D2; 8,950±0,086 U/mg) tespit edildi. Deneme grupları arasında istatistiksel olarak bir farka rastlanılmazken (P>0,05), kontrol grubu ile aralarındaki farkın anlamlı olduğu görüldü (P<0,05). Kas analizine benzer sonuçlar hepatopankreas sonuçlarında görüldü. Deneme grupları rakamsal olarak birbirine çok yakın (D1; 7,182±0,094 U/mg ve D2; 7,110±0,220 U/mg) ve kontrol grubu değerinden (K; 5,898±0,331 U/mg) yüksek oldukları tespit edildi. Dene grupları arasında istatistiki bir fark yoktu (P>0,05) ve deneme grupları kontrol grubundan istatistiksel olarak farklıydı (P<0,05). MDA kas analizlerine bakıldığında en düşük değerin D2 grubunda (2,088±0,089 µM) olduğu, onu D1 grubunun takip ettiği (2,434±0,110 µM) ve en yüksek değerin kontrol grubunda (3,376±0,213 µM) olduğu görüldü. Deneme grupları arasında istatistiksel olarak farkın olmadığı, control grubundan ise istatistiksel olarak farklı oldukları tespit edildi. Hepatopankreas sonuçlarında da kas grubuna benzer durum görüldü. En düşük MDA değeri D2 grubunda (4,354±0,143 µM), ikinci olarak D1 grubunda (4,696±0,192 µM) ve en yüksek değerin kontrol grubunda (6,768±0,112 µM) olduğu gözlemlendi. Deneme grupları arasında istatistiki olarak bir fark olmazken, deneme grupları ile kontrol grubu arasında istatistiki bir farkın olduğu saptandı. Anahtar Kelimeler: Tunceli sarımsağı, Allium tuncelianum, Astacus leptodactylus, antioksidan

  İncele
• MakaleAçık Erişim2022Scopus SJRQ3/r/munzur/2829
  Effects of kefir supplementation on body antioxidant-systems, haemolymph heat-shock protein 70 and trypsin, in the crayfish Astacus leptodactylus Eschscholtz (Decapoda, Astacidea)

  Aksu, Önder; Türkoǧlu, Semra; Can, Erkan; Erişir, Mine; Kocabaş, Mehmet; Kayim, Murathan; Benzer, Fulya

  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 ( p > 0.05) and muscle tissues ( p < 0.05) with increasing kefir concentration, while CAT activity increased ( p < 0.05). Trypsin and HSP70 insignificantly decreased in haemolymph.

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  AtıfScopus1·WoS1·OpenAlex1

  İncele
• MakaleYalnız künye2020Scopus SJRQ3/r/munzur/4746
  The Use of Astacus leptodactylus (Eschscholtz, 1823) as a Test Species for Toxicity Evaluation of Municipal Wastewater Treatment Plant Effluents

  Yildirim, Cikcikoglu N.; Aksu, O.; Tatar, S.; Yildirim, N.

  This study evaluated the responses of biochemical biomarkers in Astacus leptodactylus exposed to treated municipal effluents discharged into Keban Dam Lake, Elazig Elazig, Turkey. A. leptodatyclus were exposed to treated municipal effluents and Catalase (CAT), Superoxide dismutase (SOD) activity and lipid peroxidation (TBARS), glutathione (GSH) levels were measured as oxidative stress biomarkers. SOD activity was increased after exposing to treated municipal effluents for 24th and 96th h. CAT activities were decreased from 25.29 to 14.12 nmol/min/ml compared to control in the group exposed to treated municipal effluents for 24 h but it increased after 96 h exposure. GSH levels were decreased from 9.08 to 3.77 mu M compared to control, but MDA levels were increased both at 24 th h and 96 th h after exposure to treated municipal effluents. CAT, SOD activities and MDA and GSH levels in the hepatopancreas of A. leptodactylus are sensitive and suitable biochemical biomarkers for evaluating the toxicity of the treated municipal effluent complex mixtures. Treated municipal effluents exposure was found to cause sub-lethal responses in A. leptodactylus suggesting oxidative stress.

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  AtıfWoS2·OpenAlex3

  İncele
• MakaleYalnız künye2020Scopus SJRQ4/r/munzur/3199
  A comparison of morphometry features of the narrow-clawed crayfish (Astacus leptodactylus Eschscholtz, 1823) living in two different habitats

  Yuksel, Fahrettin; Cilbiz, Mehmet; Demirol, Ferhat; Capkin, Kadir; Bektas, Zubeyde Hanoi; Gunduz, Fatih

  Narrow-clawed crayfish (Astacus leptodactylus Eschscholtz, 1823) is native species to Turkey and the most important shellfish because of its commercial value and ecological role in ecosystem. The knowledge on bio-ecological features of narrow-clawed crayfish is limited. In this study, total length (TL), carapace length (CL), carapace width (CW), abdomen length (AL), abdomen width (AW), chela length (ChL) and chela width (ChW) of narrow-clawed crayfish were compared in two different habitats (Egirdir Lake and Keban Dam Lake). According to linear regression analysis, the highest relation was between TL and AL (R2=0.987) of the female in Egirdir Lake and the weakest relationship was between AW and ChL (R2=0.084) in Keban Dam Lake. Overall, the biometric features of A. leptodactylus populations in Egirdir Lake and Keban Dam Lake were different and these differences were significant in mid-length groups. These findings clearly demonstrated the impact of commercial catching on the length distribution of the crayfish stocks.

  AtıfScopus5

  İncele
• MakaleAçık Erişim2018Scopus SJRQ2/r/munzur/3114
  Observations of crayfish plague infections in commercially important narrow-clawed crayfish populations in Turkey

  Kokko, Harri; Harlioglu, Muzaffer M.; Aydin, Hamdi; Makkonen, Jenny; Gökmen, Gökhan; Aksu, Önder; Jussila, Japo

  We studied the presence of possible Aphanomyces astaci infections in eight Turkish narrow-clawed crayfish (Astacus leptodactylus) populations by analyzing the prevalence and genotypes of the disease agent A. astaci. The qPCR analyses revealed A. astaci infection in seven of the studied eight populations, with the agent level A2 or higher. The agent levels among the infected populations varied from A0 to A5, i.e., from negative to high level of infection, based on qPCR ranking. Based on the sequencing of the chitinase gene and the mitochondrial ribosomal rnnS and rnnL subunits, we detected both A (As) and B (PsI) haplogroups of A. astaci in our samples, with each of the studied populations being carriers of only one haplotype. The results confirm previous detections of A. astaci in Turkish narrow-clawed crayfish populations and reveal, that both A and B haplogroup A. astaci carriers exist widely in A. leptodactylus populations of Turkey.

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  AtıfScopus28·WoS29·OpenAlex23

  İncele
• MakaleYalnız künye2017Scopus SJRQ3/r/munzur/4320
  MONTHLY VARIABILITY OF OXIDANT AND ANTIOXIDANT BIOMARKERS OF FRESHWATER CRAYFISH (ASTACUS LEPTODACTYLUS ESCH., 1823)

  Barim-Oz, Ozden; Yilmaz, Seval; Sahin, Hulya; Benzer, Fulya

  In the present study was determined the effects of monthly variability on enzymatic antioxidant (superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-Px)), antioxidant (reduced glutathione (GSH)) and the oxidant status (nitric oxide (NO), lipid peroxidation (MDA)) in hepatopancreas, muscle, gills and gonad tissues of freshwater crayfish (A. leptodactylus) the monthly collected throughout the year from Keban Dam Lake of Turkey. Results indicate that variations in oxidants and antioxidants with relation to month were not only tissue specific but also were gender specific. The levels of oxidant parameters were generally higher in hepatopancreas in comparison to muscle, gills and gonad of crayfish. Moreover, in tissues were also determined the different oxidants and antioxidants responses in moulting, mating, breeding and egg laying periods.

  AtıfWoS5

  İncele
• MakaleYalnız künye2017Scopus SJRQ3/r/munzur/3890
  Biochemical impacts of the textile dyes Remazol Brillant Blue R and Congo Red on the crayfish Astacus leptodactylus (Decapoda, Astacidae)

  Aksu, Onder; Yildirim, Nuran Cikcikoglu; Danabas, Durali; Yildirim, Numan

  In this study, we determined the effects of the textile dyes Remazol Brillant Blue R (RBBR) and Congo Red (CR) on the enzymatic activities of Glutathione S-Transferase (GST), cytochrome P450 (CYP1A1) and Lactate dehydrogenase (LDH), in hepatopancreas of Astacus leptodactylus. The crayfishes were exposed to 0.5, 1.0, and 2.0 mg/l of RBBR or CR, for 24 and 48 h. The recorded GST activity clearly increased after 24 or 48 h exposure to CR, compared to a control group (p<0.05), but the changes of GST activity depending on time and dose were not statistically significant in the RRBR group (p<0.05). The activity of CYP1A1 generally decreased, but LDH activity increased in the groups exposed to different doses of CR and RBBR, when compared to their control groups. Detoxification enzymes (as GST, and CYP1A1) and metabolic enzymes (as LDH) can be proven to make useful markers for further evaluating the physiological effects of CR and RBBR on crayfish.

  AtıfScopus21·WoS19·OpenAlex23

  İncele
• MakaleAçık Erişim2016Scopus SJRQ3/r/munzur/4642
  The influence of dietary antioxidant on ovarian eggs and levels of vitamin E, C, A, astaxanthin, β-carotene and oxidative stres in tissues of Astacus leptodactylus (Eschscholtz)

  Barim-Oz, O.; Sahin, H.

  The experiment was conducted to determine the most effective antioxidant (among the vitamin E (VE), vitamin C (VC), vitamin A (VA), astaxanthine (AX), beta-carotene (beta C)) on the ovarian egg number and size, level of VE, VC, VA, AX, beta C and oxidative stress (as malondialdehyde (MDA)) in the hepatopancreas, ovarian, gills and muscle tissue during ovarian development of Astacus leptodactylus. One control (C) and five experimental diets (EE, EC, EA, EAX and E beta C) were prepared. The EE, EC, EA, EAX and E beta C groups were formed by added 150 mg kg-1 VE, 200 mg kg-1 VC, 240 mg kg-1 VA, 200 mg kg-1 AX and 200 mg kg-1 beta C to diet C, respectively. At the end of the experiment found that the dietary antioxidants increased ovarian egg number and size and reduced the level of MDA in the tissues. Ovarian egg number and size were highest in the EE and EAX diet groups in the comparison to control (p< 0.001). The level of MDA in the tissues was lowest in the EAX diet group in the comparison to control (p< 0.001). The highest levels of VE, VC, VA, AX and beta C were found in the hepatopancreas and ovarian compared with muscle and gills. The highest level of MDA also was determined in the ovarian according to other tissues. In conclusion, the VE and AX in broodstock diets were the most effective antioxidants on the ovarian egg number and size of A. leptodactylus.

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  AtıfWoS16·OpenAlex53

  İncele
• MakaleYalnız künye2015Scopus SJRQ1/r/munzur/4761
  Biochemical response of crayfish Astacus leptodactylus exposed to textile wastewater treated by indigenous white rot fungus Coriolus versicolor

  Aksu, Onder; Yildirim, Nuran Cikcikoglu; Yildirim, Numan; Danabas, Durali; Danabas, Seval

  The discharge of textile effluents into the environment without appropriate treatment poses a serious threat for the aquatic organisms. The present study was undertaken to investigate biochemical response of crayfish Astacus leptodactylus exposed to textile wastewater (TW) treated by indigenous white rot fungus Coriolus versicolor. Glutathione S-transferase (GST), cytochrome P450 1A1 (CYP1A1), and acetylcholinesterase (AchE) levels in hepatopancreas and abdomen tissues of crayfish exposed to untreated, treated, and diluted rates (1/10) in both TW during 24 and 96 h were tested. Physiochemical parameters (electrical conductivity (EC), chemical oxygen demand (COD), pH, and total dissolved solid (TDS)) of TW were determined before and after treatment. Physiochemical parameters of TW decreased after treatment. The GST activity and AchE were generally increased, but CYP1A1 activity was decreased in hepatopancreas tissue of crayfish exposed to different kinds of untreated TW. After treatment by indigenous white rot fungus (C. versicolor), GST and CYP1A1 activities were returned to control values, while AchE activities were increasing further. In this study, only GST and CYP1A1 activities of A. leptodactylus confirmed the efficiency of TW treatment with C. versicolor.

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  AtıfWoS23·OpenAlex27

  İncele
• MakaleAçık Erişim2013Scopus SJRQ3/r/munzur/4867
  Leslie Population Estimation for Turkish Crayfish (Astacus leptodactylus Esch., 1823) in the Keban Dam Lake, Turkey

  Yüksel, Fahrettin; Demirol, Ferhat; Gündüz, Fatih

  The population size was researched by using Leslie method on the zones of Keban Dam Lake where crayfish is fished for commercial purposes. The data were compiled by using effort expended and catch obtained by 28 fishing boats during 2012 crayfish fishing season. 28 fishing boats fished 16,867 kilograms of crayfish during the fishing season by using 45,600 pieces of crayfish fyke nets. It is determined that the quantity catch per unit effort (CPUE) varies between 2.74 to 6.35 kg/100 fyke nets/week during the 9 weeks fishing period. The population size at the beginning was estimated to be 28,450 kg (at minimum legal length of >= 10 cm). The 95% confidence interval of this estimation was calculated to be 25,607-32,533 kg. Similar researches on crayfish populations concluded that removal method can offer very important details.

  AtıfWoS11·OpenAlex13

  İncele
• MakaleÖn baskısı açık2013Scopus SJRQ2/r/munzur/4538
  Effect of dietary n-3 series fatty acids on sperm production in the freshwater crayfish, Astacus leptodactylus (Eschscholtz) (Astacidae)

  Harlioglu, Muzaffer Mustafa; Köprücü, Kenan; Harlioglu, Ayse Gul; Yonar, Serpil Mise; Duran, Tuba Cakmak; Çakmak, Mehmet Nuri; Aksu, Onder; Özcan, Sinan; Kutluyer, Filiz; Gündogdu, Hande

  The objective of the present work was to evaluate the effects of three different rates of long chain n-3 polyunsaturated fatty acid (LC n-3 PUFA) on the sperm number of Astacus leptodactylus. The experiment was carried out with the four following treatments: control group (not supplemented LC n-3 PUFA), D1 (1 %), D2 (2 %) and D3 (3 %). The sperm number of A. leptodactylus was counted; the reproductive system was weighted; and the macroscopical analysis of the testes and vasa deferentia (DVD) were conducted. In addition, gonado-somatic index (GI) and testes index (TI) were also calculated. The results showed that there was a significant difference between the crayfish fed LC n-3 PUFA supplemented diets (D1, D2, D3) and control in mean sperm number (P < 0.05). The highest sperm number was found for the crayfish fed D3 (6.27 +/- A 0.14 x 10(8) sperm/distal vas deferens section). The results also showed that the reproductive system of the crayfish fed D3 and D2 was significantly heavier than that of the crayfish fed the control and D1 (P < 0.05). On the other hand, there was not a significant difference in the testes weight and vasa deferentia weight between the crayfish fed the control and D1, and between the crayfish fed D2 and D3 (P < 0.05). GI of the crayfish fed D3 and D2 was significantly higher than that of the crayfish fed control and D1 (P > 0.05), but there was not a significant difference in the TI of the crayfish fed control, D1, D2 and D3 (P > 0.05). In conclusion, diets containing different levels of LC n-3 PUFA significantly increase the sperm number of A. leptodactylus, and they are crucial for the production of higher number of sperm in this species.

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  AtıfWoS30·OpenAlex34

  İncele
• MakaleAçık Erişim2013Scopus SJRQ4/r/munzur/4143
  Bioaccumulation of Copper and Zinc in Freshwater Crayfish (Astacus leptodactylus) Fed with Zebra Mussels (Dreissena polymorpha) Collected from Keban Dam Lake, Turkey

  Aksu, Onder; Gulec, Azime Kucukgul; Demir, Veysel; Danabas, Durali; Yildirim, Numan; Ozcelik, Mehtap; Can, Erkan; Kocabas, Mehmet

  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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  AtıfWoS2·OpenAlex2

  İncele
• Derleme MakaleAçık Erişim2011Scopus SJRQ2/r/munzur/4619
  Status of freshwater crayfish (Astacus leptodactylus) in Iran

  Karimpour, M.; Harlioglu, M. M.; Aksu, O.

  Iranian native crayfish includes one crayfish species, Astacus leptodactylus, with two subspecies, A. l. leptodactylus (lives in freshwater) and A. l. eichwaldi (lives in the Caspian Sea with 12 ppt salinity). Only A. leptodactylus is commonly distributed in Iranian water resources. Nearly 80 years ago local fishermen started to catch Anzali Lagoon crayfish and sold them to foreigners and embassy employees. The consumption of crayfish in Iran is very low, approximately 1 t annually. The first commercially significant crayfish harvest in Iran was 11.3 t from Anzali Lagoon in 1985. It was carried out by a Turkish company. In 1985, the introduction of A. leptodactylus was started into suitable Iranian freshwaters. For example, crayfish from Anzali Lagoon were introduced into Arass water reservoir in 1985. Today, Arass water reservoir is the main resource of crayfish in Iran. There was no further crayfish harvest in Iran until 1993. In that year, a private Iranian company began harvesting the Iranian crayfish and exporting them to European countries. In 1993, 3.2 t of crayfish were exported from Iran. Although there have been fluctuations between years, the export of crayfish in Iran increased remarkably after 1996. The successful results of crayfish introductions gave rise to this increase. In 2003, the export of A. leptodactylus from Iran reached the maximum level (216 t). The commercial value of exported crayfish between 2000 and 2009 varied from 1.5-2.5 million US$ annually and its amount was 106-211.5 t. However, there was a reduction in the export of A. leptodactylus from Iran after 2003, to just above 100 t. In conclusion, in order to increase crayfish production in Iran, introduction of A. leptodactylus into suitable water resources, and management, conservation and monitoring of present crayfish populations should be carried out.

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  AtıfWoS21·OpenAlex26

  İncele
• MakaleYalnız künye2011Scopus SJRQ3/r/munzur/4199
  MALONDIALDEHYDE LEVELS AND GLUTATHIONE PEROXIDASE ACTIVITIES IN THE TISSUES OF FRESHWATER CRAYFISH (ASTACUS LEPTODACTYLUS ESCH 1823) IN CULTURE CONDITION

  Kandemir, F. M.; Benzer, F.; Erisir, M.; Yildirim, N. C.

  The objective of the study was to characterize the effects of sex on lipid peroxidation (as malondialdehyde, MDA), antioxidant defence system (as glutathione peroxidase, GSH-Px) in the hepatopancreas, gonad and muscle tissues of freshwater crayfish, Astacus leptodactylus, in culture condition. The crayfish used in the present study was provided from Keban Dam Lake population of A. leptodactylus. 34 males and 30 females crayfish in different size were hold in stock ponds (6 x 6 x 0.5 m). This study was carried out between June 18, 2004 and December 1, 2004 at the crayfish reproduction unit of Aquaculture Faculty of Firat University, Elazig, Turkey. Plastic pipes (20 cm in length and 7 cm in diameter) were provided as shelters for the crayfish. Crayfish were fed 2 % of their total wet weight daily with prepared ration. Crayfish were exposed to natural photoperiod. During the study, the mean water temperature, dissolved oxygen and mean pH were 4 degrees C, 6.28 +/- 0.32 mg L-1 and 7.82 +/- 0.17, respectively. MDA and GSH-Px levels according to sex and tissue-species were determined. MDA level in the hepatopancreas and gonad of females were higher than males, except muscle tissue (P<0.001). However, the GSH-Px activities in the hepatopancreas and gonad of males were higher than females, except muscle tissue (P<0.001). As a result, MDA and GSH-Px levels in the hepatopancreas, gonad and muscle tissues of freshwater crayfish, Astacus leptodactylus, in culture condition changed both tissues and sex.

  AtıfWoS4

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