Ali Rıza Kosker

Cukurova University | CU · Faculty of Fisheries

Tetrodotoxin (TTX) levels in Lagocephalus sceleratus (Silverstripe blaasop), Lagocephalus spadiceus (Half-smooth golden pufferfish) and Lagocephalus suezensis (Suez puffer) caught in Mersin Bay in the Northeastern Mediterranean Sea were analysed using Q-TOF LC/MS. Pufferfish were caught using trawl fishing, longlining and fishing line from December...

The effects of season and gender on the proximate composition and fatty acid profiles of the most widespread pufferfish species in the Mediterranean Sea (Lagocephalus sceleratus, L. spadiceus, L. suezensis and Torquigener flavimaculosus) caught in Mersin Bay, in the northeastern Mediterranean during 4 seasons were investigated. The results showed t...

Tetrodotoxin (TTX) is a crystalline, weakly basic, colorless organic substance and is one of the most potent marine toxins known. Although TTX was first isolated from pufferfish, it has been found in numerous other marine organisms and a few terrestrial species. Moreover, tetrodotoxication is still an important health problem today, as TTX has no k...

This study analyzed 34 canned fish products, including 28 tuna specimens, 3 salmon specimens, 1 mackerel specimen, and 1 anchovy specimen, from 13 different brands purchased in Türkiye. The study aimed to determine metal/metalloid levels in canned fish and potential health risks for both children and adult consumers. The metal/metalloid levels in t...

The silver-cheeked toadfish (Lagocephalus sceleratus), an invasive alien pufferfish species that has rapidly settled throughout the Mediterranean region, poses significant threats not only to native marine species and fisheries but also to public health due to the tetrodotoxin (TTX) they harbor. In this study, TTX concentrations in L. sceleratus fr...

The extracts of Padina pavonica (a macroalgae, ME), Rubus fruticosus (blackberry) leaves (BE), Juniperus oxycedrus waste (JWE) and Juniperus communis needles (JE) were used to evaluate their potential effects on chemical, microbial and organoleptic qualities of sea bass (Dicentrarchus labrax). The sensory assessment showed that fish fillets treated...

The effects of citrus essential oils (orange, lemon, mandarin, and grapefruit) on the oxidative stability of microencapsulated fish oil by spray-drying were evaluated. The encapsulation efficiency of microcapsules was in the range of 42.25 and 62.43%. Twelve active substances were determined as major volatile components of citrus essential oils. Th...

The presence of microplastics (MPs) in processed seafood is a growing concern. In this study, 33 different canned fish brands belonging to 7 producers were purchased from the Turkish market and investigated. MPs composition, possible sources, and potential intake were assessed. Light microscopy was used to quantify potential MPs, and micro-Raman mi...

Fish (Engraulis encrasicolus) oil was successfully microencapsulated using sage essential oils prepared in three different concentrations as 1% (S1), 2% (S2) and 3% (S3). The microencapsulated fish oil powders fabricated with spray drying were stored at room temperature (24 ± 1 °C) in order to determine the oxidative deterioration for 12 weeks. The...

Pangasius hypophthalmus (panga fish) is farmed in the Mekong River (Vietnam), which is known as a polluted river, and exported to many countries. The present study aimed to determine heavy metal levels in frozen panga fillets imported from Vietnam as well as the risks of heavy metals to human health. Panga fillets belonging to four brands were boug...

A comparative study on the effects of marjoram (ME) and olive leaf (OLE) extracts on the quality parameters of red and ordinary muscles of tuna–like fillets kept under vacuum–packaging at refrigerated storage were investigated in this study. Tuna–like (Auxis thazard) fillets were dipped in sterile plant extract solutions (0.5% w/v) for five minutes...

This study analyzes the metal/metalloid levels in stuffed mussels (Mytilus galloprovincialis) sold in five cities in Turkey and evaluates the possible health risks these levels pose for children and adults. Inductively Coupled Plasma–Mass Spectrometer (ICP–MS) was used to determine the metal levels of samples. In stuffed mussels, the highest levels...

Nisin is produced by Lactococcus lactis subsp. lactis and also known as an antimicrobial agent especially against gram-positive bacteria. It has been used as a preservative in foods and beverages for a long time and generally regarded as safe (GRAS). In the present work, the effects of different concentrations of nisin (0.2, 0.4 and 0.8%) on the se...

The influence of oil-in-water nanoemulsion using commercial olive oil at different concentrations on the fatty acid profile of rainbow trout fillets stored at 4 ± 2 °C was evaluated. At the end of the storage period, the highest content of the total saturated fatty acids (SFA) was found in the control samples (18.1%) while the lowest content was ob...

The levels of 13 different metals (Mg, P, K, Fe, Cu, Zn, Mn, Se, Al, Cr, As, Cd and Pb) in mantle and arm tissues of Octopus vulgaris species, which were caught from Mersin Bay in winter, spring and summer seasons, were determined. The results were compared between the tissues and seasons. Potential health risks of consumption of common octopus, wh...

The antibacterial activities of nanoemulsions based on essential oil of thyme and its purified version on food-borne pathogens (S. Paratyphi A, S. aureus, K. pneumoniae, and E. faecalis) and spoilage bacteria of fish (P. luteola, P. damselae, V. vulnificus, E. faecalis, S. liquefaciens, and P. mirabilis) were evaluated using disc diffusion, MIC and...

Metal and fatty acid levels of some commercially important fish and crustacean species of economic value in the northeastern Mediterranean (Mersin Bay) were investigated. In addition, to predict possible risks regarding consumer health that may arise from the consumption of these species, risk estimates were calculated for adults and children consi...

The effects of nisin at different concentrations (0.2, 0.4 and 0.8% w/v) on the sensory, biochemical and microbiological quality parameters of sea bass (Dicentrarchus labrax) fillets were investigated under the chilled storage at 4 ± 2 °C. The results of the study showed that the shelf life of the fish fillets (raw and cooked) was found as 6 days f...

In this study the effects of nisin used at different concentrations (0.2%, 0.4% and 0.8% w/v) on the fatty acids profile of vacuum-packed sea bass (Dicentrarchus labrax) fillets were investigated during the 18 day of cold storage period. As a result of the fatty acid analysis throughout storage high concentration saturated fatty acids (SFA) were de...

In this study the effects of nisin used at different concentrations (0.2%, 0.4% and 0.8% w/v) on the fatty acids profile of vacuum-packed sea bass (Dicentrarchus labrax) fillets were investigated during the 18 day of cold storage period. As a result of the fatty acid analysis throughout storage high concentration saturated fatty acids (SFA) were de...

The impacts of water and ethanolic extracts of propolis at a dose of 0.4 or 0.8% on vacuum packaged sardine fillets inoculated with Morganella psychrotolerans DSM 17886 during storage at 3 ± 1°C for 15 days were investigated. All fish groups were inoculated with M. psychrotolerans (108 cfu/ml) at a rate of 1%. Sensory, colorimetric, chemical analys...

The influences of nanoemulsions based on citrus peel (orange, lemon, mandarin, and grapefruit) essential oils on the biogenic amine (BA) formation in rainbow trout (Oncorhynchus mykiss) fillets stored 4 ± 2°C were investigated. The results demonstrated that main BAs in the trout fillets were putrescine, cadaverine, spermidine, spermine, serotonin,...

The quality of vacuum packed sea bass fillets treated with nanoemulsions based on commercial oils (hazelnut oil, corn oil, canola oil, soybean oil, olive oil, and sunflower oil) at 2 ± 2°C was evaluated by sensory, chemical (thiobarbituric acid reactive substances, peroxide value, total volatile basic nitrogen, and free fatty acids), and microbiolo...

This study was conducted to investigate the effects of nanoemulsions prepared with various concentrations of olive oil on the sensory, chemical and microbiological quality of rainbow trout fillets. The results showed that the shelf life of rainbow trout fillets were determined as 10 days for the control, 12 days for tween 80 group, 14 days for the...

While conventional technologies such as chilling and freezing are used to avoid deteriorative processes like autolytic and microbial spoilage of seafood, innovative technologies have also been developed as a response to economic and environmental demands. Innovative Technologies in Seafood Processing gives information on advances in chilling, freez...

This study aimed at comparing the elemental levels of muscle and liver tissues of four pufferfish (Lagocephalus sceleratus, Lagocephalus spadiceus, Lagocephalus suezensis, and Torquigener flavimaculosus), which are common in the Northeastern Mediterranean Sea (Mersin Bay), in terms of sex and seasonal variables. Na, Mg, P, K, and Ca levels in the m...

Aim The combined effects of oregano extract with vacuum packing (VP) on the quality enhancement of dark and white muscles of frigate tuna (Auxis thazard) stored as intact fillet at refrigerated (3±1°C) conditions were studied. Materials and Methods About 35 kg of fish were filleted without skin removal and randomly divided into two groups. One gro...

In this study, the relationships were determined between the macro (Na, Mg, P, K, Ca), potential toxic metal, As, and trace element, Zn, levels of the muscle tissue and fish size (length and weight) in Serranus cabrilla (Linnaeus, 1758) caught via bottom trawl boat from the Yeşilovacık Bay (Northeastern Mediterranean, Turkey). The potential toxic m...

The efficiency of green extraction methods (ultrasound‐assisted extraction (UAE) and microwave‐assisted extraction (MAE) and conventional methods (Soxhlet and Bligh and Dyer) on lipid content and fatty acid profiles of six fish species (Mullus barbatus, red mullet; Upeneus moluccensis, goldband goatfish; Mullus surmuletus, surmullet; Anguilla angui...

The present paper examines the impacts of gender and season variables on the nutritional composition and metal levels of warty crab caught in the central Black Sea region (Ordu). Crab samples were caught over 4 seasons, using gillnets, trammel net, and SCUBA diving. Results of chemical analysis showed that protein, lipid, moisture, and total minera...

In this study, the proximate composition of muscle tissue was investigated in lion fish (P. miles), which has a high invasion potency in the Mediterranean. At the same time, the potentials of accumulation of essential and toxic metals in brain, gill, muscle and liver tissues have been examined. The study was carried out with 4 lion fish individuals...

In this study, the proximate composition of muscle tissue was investigated in lion fish (P. miles), which has a high invasion potency in the Mediterranean. At the same time, the potentials of accumulation of essential and toxic metals in brain, gill, muscle and liver tissues have been examined. The study was carried out with 4 lion fish individuals...

The effects of seasonal and sexual differences on the levels of macro, trace element, and toxic metal levels in Mullus barbatus were investigated using the ICP-MS. The quantity relationships of macro elements were found as K>P>Na>Ca>Mg for male, P>K>Na>Ca>Mg in female; the quantity relationships of trace elements were determined as Fe>Zn>Mn>Mo>Se>C...

In this study, it was aimed to determine the chemical composition of the pufferfish (Lagocephalus sceleratus) caught from Mersin Bay in the Northeastern Mediterranean Sea. For this purpose, the proximate composition, fatty acid profile, mineral and heavy metal levels were investigated. Pufferfish samples were caught using trawl fishing technique ov...

In this study, heavy metal levels in muscle and liver tissues of different age groups of Lagocephalus sceleratus caught in the Mersin Bay were investigated. Six different age groups were determined among fishes caught using commercial trawlers from the Mersin Bay. The lengths of fish were measured between 17 cm and 68 cm, the weights were measured...

It has been well documented that polyunsaturated fatty acids (PUFAs), especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) have beneficial effects on health, regarding prevention of cardiovascular diseases, cancer and autoimmune disorders, development the brain and retina and treatment of major depressive disorder etc. Thus, an ade...

In this study, the effects of seasonal variation in proximate composition and fatty acid profile as a component of chemical compositions of Mediterranean Sea anemone species (Actinia equina L.,1758) living in Mersin Bay were investigated. Chemical composition analysis of anemone samples showed that while the highest levels of protein and water were...

The chemical, sensory, microbiological, protein profile and textural changes of vacuum-packaged ‘gravad’ carp fillets (Cyprinus carpio) were investigated during storage at 3 °C. Sensory analyses showed that vacuum-packed gravad was still acceptable at the end of 8 weeks of storage. Due to gravading, the total viable count did not exceed the accepta...

The effects of oil-in-water nanoemulsions using different commercial oils on the fatty acid composition of vacuum packed sea bass (Dicentrarchus labrax) fillets stored at 2 ± 2 °C were investigated. The highest SFA content was obtained from the control (21.89%) and among treated groups sunflower (20.13%) followed by olive group (19.90%) because of...

The use of nanotechnology in the food area is still at a very limited scale despite the high potential benefit from nanotechnology in the food industry. However, in recent years international food companies have paid attention to benefit from this technology and nanotechnology-based techniques have been introduced to the food industry to provide so...

Mediterranean is exposed to intense impact of new lessepsian migrant species. The effects alien species are observed on native species, marine ecosystems and fisheries. However, the effects of pufferfish belongs family of Tetraodontidae is gaining more importance among allien species. Pufferfish contained one of the strongest marine toxins called t...

In this study, the metal and mineral concentrations of some marine species from Northeastern Mediterranean Sea were determined. of muscle tissue in all species were determined as 4.26-6.56 µg/g, 0.12-20.62 µg/g, 14.77-119.01 µg/g, 57.90-91.91 µg/g, 728.55-2506.70 µg/g, 1240.70-1758.10 µg/g, and 3539.70-8465.80 µg/g, respectively. The quantity relat...

The effects of the seasonal on the proximate and fatty acid compositions of male and female warty crab from Black Sea were investigated. Important differences were found in proximate and fatty acid compositions for all seasons and gender. There were variations in protein and water content of meat of female and male crabs (p<0.05). The results of fa...