Kuzgun, N.K.

In this study, fish chips were produced using Luciobarbus esocinus, their fatty acids and amino acids profiles were determined and they were sensorially evaluated. For the preparation of experimental samples, L. esocinus meat was minced and added to a basic chips mixture. After that, the mixture was divided into in two: while pepper sauce was added to one half, the other half had no sauce added. The mixtures with sauce and without sauce were shaped into chips. Two samples of each batch of the chips prepared were cooked using two different methods (baking and frying). In this way four different groups were obtained. Analysis of fatty acids showed that the pre-frying and the pre-baking process resulted in a decrease in all fatty acids except for 18:1n-9 and 18:2n-6. Analysis of amino acids showed that isoleucine, lysine, threonine and, proline were present in the highest quantities respectively. After frying and baking the amounts of leucine, isoleucine, lysine, arginine, phenylalanine, and threonine decreased while the amounts of the valine and histidine remained at the same level. The essential amino acids for humans were found in the fish meat and in the fish chip groups, except for tryptophan. The general acceptability score of the fish chips was highest for group A which consisted of chips with sauce that had been fried (9.28±0.69).

İncele

Kizak, V.; Ozden, O.; Guner, Yusuf

In this study, rainbow trout (Oncorhynchus mykiss) (162.7 +/- 3.03 g) and brown trout (Salmo trutta forma fario) (160.9 +/- 2.94 g) were transferred to full-strength seawater (36.5 gl(-1)) for directly and gradually (21 days), then changes in gill Na+-K+-ATPase activity and size of chloride cells associated with environmental salinity were investigated and also survival of trouts were evaluated in seawater. All fish died when brown trouts were transferred into seawater directly but rainbow trouts survived 50 - 58.3 %. However, significant difference was recorded between brown and rainbow trouts in terms of survival rates by gradual acclimation. Survival of brown trout and rainbow trout that were transferred in seawater gradually, was 66.7 - 75 % and 83.3 - 91.7 %, respectively (p < 0.05). Gill chloride cell sizes in both species increased at 36.5 gl(-1) salinity. The lowest sectional area of chloride cells was determined at the point of death in brown trouts which were transferred directly. Following direct transfer to seawater, the largest sectional area of chloride cells were determined in rainbow trout. There are significant differences between acclimated and non-acclimated fish in terms of chloride cell sizes and Na+-K+-ATPase activities (p < 0.05). The highest gill Na+-K+-ATPase activity was in brown trouts which were transferred gradually, while the lowest activity was detected in freshwater phase. According to the results, gradually acclimated trouts can perform better adaptation than their directly acclimated counterparts.

AtıfWoS1

İncele

Kocabas, M.; Basçinar, N.; Sahin, S. A.; Kutluyer, F.

Salmo trutta caspius T., 1954 is a native to Caspian Sea and is an important fish species due to its aquaculture potential, economic value and high marketability. The aims of this study were to determine hatching rate, body and yolk weight at hatching, the growth rate during the yolk absorption and yolk conversion efficiency of S. I. caspius larvae. Studies were further extended to determine the relationships between length, total wet weight, dry yolk body weights of alevins and degree-days. Results revealed that the mean wet weight was 16.78 +/- 2.17 mg (n = 10) at hatching and reached 52.62 +/- 3.55 mg just before the swim-up stage. The mean dry weights of the body and yolk sac were 2.36 +/- 0.28 mg and 10.67 +/- 0.67 mg at hatching and 7.21 +/- 0.71 mg and 2.57 +/- 0.62 mg at swim-up stages, respectively. The mean body dry matter and water content of the larvae were 33.10% and 66.90% at hatching and 15.46% and 84.54% of the total biomass at swim-up stages, respectively. Our results indicated that dry yolk, total larval weights and dry matter of the larvae decreased, while body weight and water content increased with degree-days. The growth of larva, yolk sac absorption and yolk conversion efficiency were calculated as 0.18 mg/day, 0.23 mg/day and 0.60, respectively. The data collected during these studies contribute to the management practices of the stocks of this species.

AtıfWoS2

İncele

Yildirim, N. C.; Benzer, F.; Danabas, D.

Aim of this study was to determine the extent of pollution in the Munzur River in Turkey was determined. The antioxidant (reduced glutathione (GSH), glutathione peroxidase (GSH-Px) catalase (CAT)) and the oxidant (MDA) status of hepatopancreas, gills, muscle, heart and kidney tissues of C. trutta were chosen as bioindicators. The fish samples were caught from contaminated (Station I) and uncontaminated (Station II) stations in Munzur River during April 2010. GSH levels were lower in gill, muscle and heart of the C. trutta collected at the contaminated station (p<0.05). The MDA levels were significantly higher in gill, muscle, kidney and heart of the C. trutta from the contaminated station (p<0.05). The CAT activity was significantly increased in the gill tissue at the contaminated station (p<0.05). GSH-Px activity was significantly decreased (p<0.05) in gill, muscle, kidney and heart tissues samples from C. trutta collected at the contaminated station compared to those collected from the uncontaminated station. Overall, the results demonstrate that alteration in the antioxidant enzymes, glutathione system and induction of lipid peroxidation reflects the presence of pollution, which may cause oxidative stress in the C. trutta from Munzur River. The results provide evidence those enzymatic and non-enzymatic biomarkers of oxidative stress.

AtıfWoS24

İncele

Danabas, D.

In this trial, the lipid contents and fatty acid compositions (% of total fatty acids) of rainbow trout fed with four different ratios of clinoptilolite were studied. The fatty acid compositions of fish in groups ranged from 26.81% to 27.93 % saturated fatty acids, 25.35-31.435 % monounsaturated and 32.99-40.185 % polyunsaturated. Among them, those occurring in the highest proportions were oleic acid (C18:1n9, 19.85-22.27 %), palmitic acid (C16:0, 15.60-16.56 %), linoleic acid (C18:2n6, 11.43-18.88 %), cis-4,7,10,13,16,19-docosahexaenoic acid (C22:6n3, 13.36-15.52 %), stearic acid (C18:0, 4.25-4.75 %), palmitoleic acid (C16:1, 3.53-4.59 %), cis-5,8,11,14,17-eicosapentaenoic acid (C20:5 n3, 3.11-3.39 %), and myristic acid (C14:0, 2.56-2.85 %). The findings demonstrated that fatty acid compositions of the groups depend on feed, age, environmental conditions, and effects of feed additives like clinoptilolite. In this respect, it demonstrated that clinoptilolite can be added to fish feeds

AtıfWoS12

İncele

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

İncele

Seker, E.; Karahan, M.; Sarieyyüpoglu, M.; Çetinkaya, B.

This study was conducted to induce experimental infection in rainbow trout with Y. ruckeri, the causative agent of ERM disease and progress of the disease was then monitored over the time period. Application of PCR for early and accurate diagnosis of infection was also investigated. Total 100 fish were allocated to four experimental and a control group each containing 20 fish. There were 20 aquaria and five fish were housed in each aquaria. There were 4 replicates for each group. Fish, at an average weight of 75 g, were injected intramuscularly with 0.1 ml dilutions of Y. ruckeri at various doses (4x10(8), 1x10(8), 4x10(4) and 1x10(4) per ml) in the experimental groups. Blood samples were collected from fish that showed typical signs of the disease. DNA's extracted from blood samples were subjected to PCR amplification based upon a pair of Y. ruckeri specific primers. Following agarose gel electrophoresis of the PCR products, positive bands with the molecular size of approximately 589 bp which were considered indicative for identification as Y. ruckeri were observed. In addition, isolation and identification of Y. ruckeri from various internal organs of infected fish were made by conventional culture method. The results suggested that early diagnosis of ERM disease can be made while fish are alive and diseased fish can be isolated and treated accordingly which will help decrease economic losses.

AtıfWoS3

İncele