Effects of Fenbutatin Oxide on Antioxidant System of Different Tissues in Cyprinus Carpio (L., 1758)

YILMAZ, FERBAL ÖZKAN | HUNT, ARZU ÖZLÜER | YALIN, SERAP

In this study, effects of sublethal concentrations of fenbutatin oxide on catalase (CAT) and superoxide dismutase (SOD) activities and lipid peroxidation in muscle, liver, kidney and brain tissues of Cyprinus carpio were investigated. The 96-hours LC50 value for fenbutatin oxide was determined as 1.544 mg/L for C. carpio in this study. 0.15 mg/L (1/10 of LC50) and 0.30 mg/L (1/5 of LC50) sublethal concentrations were applied for 96 h (4 days) in this experiment. The CAT activities in tissues were increased relation to doses applied. The SOD activities were decreased by 0.30 mg/L. The tissue MDA levels were significantly increased in relation to dose applied.

Gökkuşağı alabalığı Oncorhynchus mykiss W Yemlerinde ham soya unu ve kavrulmuş soya kullanımının balıkların büyüme performansı yem tüketimi yemden yararlanma oranı ve besi maliyeti üzerine etkisi

Bilgüven, Murat | Barış, Mustafa

Effects of Chromium on the Hematocrit Levels and Erythrocyte Numbers of Cyprinus carpio

Cicik, Bedii | Çiftçi, Nuray | Ay, Özcan

Changes in hematocrit levels and erythrocyte numbers of Cyprinus carpio were determined after exposing the animals to 0.5, 1.0 and 2.0 ppm chromium over 7, 15 and 30 days. Microhematocrit and hemocytometric methods were used for determining hematocrit levels and erythrocyte numbers respectively. No mortality was observed during the experiments. Hematocrit levels and erythrocyt numbers increased under the effect of metal on day 15. Hematocrit levels and erythtrocyte numbers decreased by increasing exposure periods except at 0.5 ppm chromium.

Metal(loid) accumulation and ecotoxicological assessment in cartilaginous fishes from the Northeastern Mediterranean

Çiftçi, Nuray | AYAS, Deniz

The present study was conducted with the objective of ascertaining the levels of selected metal(loid)s in the muscle, liver, spleen, kidney, stomach, intestinal, and gonad tissues of seven distinct cartilaginous species sampled from Northern Cyprus. This initiative was undertaken to address the dearth of metal bioaccumulation data for cartilaginous species and to elucidate the impact of metal pollution on these species, which are distinguished by their limited reproductive capacity. The samples were obtained from discarded species captured during commercial fishing activities. The metal concentrations in these tissues were subsequently determined using Inductively Coupled Plasma Mass Spectrophotometry (ICP-MS). The results indicated that the kidney tissue of Squalus blainville exhibited th...

Cranial Morphometrics of a Stranded Common Bottlenose Dolphin Tursiops truncatus (Montagu, 1821) in Mersin Bay (Northeastern Mediterranean, Turkey)

AYAS, Deniz | Çiftçi, Nuray

On 10 November 2017, a young male common bottlenose dolphin Tursiops truncatus (Montagu, 1821), 185 cm in total length (TL), was found dead on the Mersin Marina (36°46'065"N, 34°34'212"E) in Northeastern Mediterranean coast of Turkey. Measurements of the sample performed and documented. The specimen buried to obtain the skeleton of the individual. At the end of this process, the sample was deposited in the Museum of the Systematic, Faculty of Fisheries, Mersin University, (Catalogue no: MEUMC-17- 11-001). The morphometric measurements can contribute to ongoing fisheries biology and taxonomic studies of T. truncatus from Mediterranean Sea waters. During routine fishing activities, common bottlenose dolphins can be caught in fishing nets and drowned. This issue leads to an extra pop...

First Record of the Pempheris rhomboidea (Kossmann Räuber, 1877) from Mersin Bay, Northeastern Mediterranean Sea

Çiftçi, Nuray | Ayas, Deniz

In this study, eight individuals of Pempheris rhomboidea (Kossmann & Räuber, 1877) were for the first time caught in the Mersin Bay, Northeastern Mediterranean Sea. Some morphometric and meristic characters of these individuals were measured. The average standard length (SL): 90.13 mm, total length (TL): 112.62 mm, the length of longest pectoral fin (LPF): 25.88 mm, the length of longest dorsal fin ray (LDF): 21.25 mm, SL/LPF: 3.88, SL/LDF: 4.24, A: III, 39-42; D: VI, 9; LL pore scales: 55-58. The ratio of eye diameter (ED) to standard length (SL) is 7.95. The presence of the non-indigenous Pempheris rhomboidea was reported for the first time from Northeastern Mediterranean Sea and second time fromTurkish marine waters.

First Report on the Elemental Composition of the Bigeye Thresher Shark Alopias superciliosus Lowe, 1841 from the Mediterranean Sea

Çiftçi, Nuray | Cicik, Bedii | Ayas, Deniz

Cartilaginous fish species have ecological importance. Besides, the ecotoxicological studies on these species are pretty insufficient. In this study, Al, Cr, Mn, Fe, Cu, Zn, As, Pb, Cd, and Sr levels were determined in muscle, liver, gill, kidney, spleen, stomach, and gonad tissues of Alopias superciliosus (Female, 240 cm TL) caught from Mersin Bay. Tissue metal analysis was determined by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). A statistical difference was found among the tissues in terms of the metals. Fe was determined to be the highest level in all tissues (pGill>Spleen>Gonad>Kidney>Stomach>Muscle. Zn was detected at higher levels in the liver and stomach and As in other tissues after Fe. Al has the highest level after Zn and As and was mainly found in the gills. ...

Occurrence of Bluntnose Sixgill Shark Hexanchus griseus (Bonnaterre, 1788) in Yeşilovacık Bay, Northeastern Mediterranean

Ayas, Deniz | Çiftçi, Nuray

Aims: In this study, an individual of H. griseus was caught from the Mersin Bay and this ichthyologic note presents a new female record of H. griseus for Mersin Bay, Mediterranean coast of Turkey. This study aims to contribute to the chronological records of the species in the Mediterranean Sea. Place and Duration of Study: Yeşilovacık bay is a small bay in the west of Mersin Bay. Yeşilovacık bay which lies at approximately 36°07’n latitude, 33°37’e, longitude and about 143 km Western of in Mersin province, Turkey. Sample: On 19 March 2018 blunthose sixgill shark specimen was measured and then deposited in the Museum of the Systematic, Faculty of Fisheries, University of Mersin. Methodology: A female specimen of H. griseus with a total length (TL) of 350 cm (400 kg) was captured b...

The protective role of ascorbic acid (vitamin C) against chlorpyrifos-induced oxidative stress in Oreochromis niloticus

YILMAZ, FERBAL ÖZKAN | HUNT, ARZU ÖZLÜER | YALIN SERAP

Ability of ascorbic acid (vitamin C) to attenuate oxidative damage was evaluated in liver and brain tissues of Oreochromis niloticus (O. niloticus) experimentally exposed to sublethal concentrations of chlorpyrifos (CPF). O. niloticus was exposed to sublethal concentrations of CPF at 12 μg/L (CPF1) and 24 μg/L (CPF2) for 96 h. The fish of vitamin C (Vit C) and CPF2 + Vit C groups were fed with Vit C supplemented diet (200 mg Vit C/100 g feed). A significant increase in thiobarbituric acid-reactive substances (TBARS) level (P < 0.05) was observed in brain of CPF-exposed fish although liver TBARS level was not changed compared to control group. This result showed that lipid peroxidation (LPO) was elevated in brain of fish exposed to CPF. Glutathione peroxidase (GSH-Px) activity in liver and ...

Determination of Fish Diversity in The Rocky Habitat Around Mersin Boğsak Island (Northeast Mediterranean) by Visual Census Method

ATEŞ, Mert | ÇİFTÇİ, Nuray | AYAS, Deniz

The study was carried out in the rocky bottom habitat of Boğsak Island in Mersin Bay in November, March and July 2022-2023, using visual census method between 0-18 m depth and the survey was conducted along a transect. In the study, the structure of the fish community of the rocky bottom habitat of Boğsak Island was determined and the seasonal availability, abundance, feeding status and distribution of native and non-native fish species were determined. Shannon-Weiner Diversity Index (H') was used to determine species diversity and multidimensional scaling analysis was used to determine the relationship between the data. A total of 29 fish species, including 28 bony fish species belonging to 15 families and 1 cartilaginous Gymnura altavela (Linnaeus, 1758) were identified in the study a...

Some deep-sea decapod crustaceans from the international waters of Mersin Bay(North Levant Basin, Turkey)

AYAS, Deniz | Çiftçi, Nuray

The deep-see decapod crustacean species sampled from trawling operations carried out in the open waters of Mersin Bay (Coordinates: 36.24853N-34.36491E, 36.18839N-43.38847E, 36.17065N-34.40686E, and 36.07227N34.53326E) in May 2018 were identified. Samples were preserved in ethyl alcohol and were deposited in the Museum of the Systematic, Faculty of Fisheries, Mersin University, (catalogue number: MEUDC-17-11-001, MEUDC-18-12- 010-014). In total 13 trawling operations, 6 deep-sea decapod crustacean species were caught. Plesionika edwardsii belonging to family of Pandalidae, Polycheles typhlops belonging to Polychelidae family, Geryon longipes from Geryonidae family, Medorippe lanata from Dorippidae family, Pasiphaea sivado from Pasiphaeidae family and Parapenaeus longirostris from Pen...

Protective Effect of Humic Substances Against Oxidative Stress Caused by Lead in Liver of Nile Tilapia, Oreochromis niloticus (Linnaeus, 1758)

YILMAZ, FERBAL ÖZKAN | HUNT, ARZU ÖZLÜER | YALIN, SERAP

In this study, the protective effect of humic substance in the fish feed was investigated against the effects of subletal lead (Pb) concentration on the antioxidant enzyme system in Oreochromis niloticus. For this purpose, the fish which were affected by 1.5 mg/L lead nitrate Pb(NO3)2 medium concentration were fed with feed containing 0.2% of humic substance. Liver samples were taken at 4th and 10th days in this study, which included control group, humic substance (HM), Pb, and Pb + HM groups. The enzyme activity of liver tissue catalase (CAT) and superoxide dismutase (SOD) of O. niloticus and the level of malondialdehyde (MDA), a product of lipid peroxidation, increased significantly at 4th and 10th days in the group with subletal lead concentration compared with the control group. Compar...

Report of Stranding of Striped Dolphin Stenella coeruleoalba (Meyen, 1833) in Mersin Bay (Northeastern Mediterranean Sea, Turkey)

AYAS, Deniz | Çiftçi, Nuray

On 08 April 2019, a mature female striped dolphin Stenella coeruleoalba (Meyen, 1833), 185 cm in length (TL), was found dead across the shores of the Mersin Naval Museum, Mersin on the northeastern Mediterranean coast of Turkey. Striped dolphins may accidentally enter the fishing nets, which may be one of the reasons for their death. Although this species has been classified as Vulnerable in the IUCN list, considering the frequency of deaths among this species, the necessity to develop species conservation strategies for the Mediterranean was once again proven by the death of this individual.

First record of the big nose shark, Carcharhinus altimus (Springer, 1950) from Mersin Bay

Ayas, Deniz | Çiftçi, Nuray | Yalçın, Esin

The total length of this shark specimen, which caught from a depth of 25 m, is 65.2 cm, and its weight is 2.2 kg. In this study, juvenile C. altimus species are more likely to be born in the Levant basin than the immigration. Their parents are highly likely to be found in the deep waters of the northeastern Mediterranean. This finding may indicate that this circumglobal species may also spread in the Northeast Mediterranean. Thus, continuous studies are needed in this region for further investigation and monitoring of these species. This research will make a significant contribution to many researchers working in this field in the future.

The Confirmed Stranding of an Adult Female Risso's Dolphin, Grampus griseus (G. Cuvier, 1812), in the northeastern Mediterranean Sea.

Ayas, Deniz | Çiftçi, Nuray | Tanış, Yekta

The study aimed to report a confirmed stranding record of an adult female Risso’s dolphin (Grampus griseus) from the northeastern Mediterranean Sea. This species is classified as "Least Concern" in the Mediterranean by the International Union for Conservation of Nature (IUCN). The individual, which was first seen alive from the Erdemli shores of Mersin Bay on 10 April 2023, was tried to push back into the water after being stranded ashore. After the individual died, the corpse was brought to Mersin University Marine Life Museum for external examination. It was determined that the individual weighed 360 kg and had a length of 330 cm. Many old and new scars were found on the individual's skin. It was understood that the newly formed deep cut marks on the head area were caused by the ...

The Comparison of Heavy Metal Level in Surface Water, Sediment and Biota Sampled from the Polluted and Unpolluted Sites in the Northeastern Mediterranean Sea

Çiftçi, Nuray | AYAS, Deniz

The determination of heavy metal level (aluminium, iron, zinc, arsenic strontium) in surface water, sediment, and biota in Iskenderun Bay, polluted site, and Mersin Bay, unpolluted site, in 2018–2019 seasonally were aimed. The muscle and liver (viscera for shrimp) tissue of three fish (Saurida lessepsianus, Nemipterus randalli, Mullus barbatus) and an invertebrate (Penaus semisulcatus) species, which have different habitats and diet, were used to detection of biota metal level. Sediment samples were analyzed in four different particle sizes which were < 63, 63 ≤ − < 125, 125 ≤ − < 250, 250 ≤ − < 500 μm mesh size. The metal levels in surface water, sediment, and biota samples were analysed with Inductively Coupled Plasma-Mass Spectrometer (ICP-MS). Statistical analysis of the data was...