Abstract
In this study, it was determined the chemical composition of the four ray species (Dasyatis pastinaca, Raja radula, Raja clavata and Torpedo marmorata) caught from Mersin Bay in the Northeastern Mediterranean Sea. For this purpose, lipid levels, fatty acid profiles, macro-trace elements, and heavy metal levels in the liver and muscle tissues of the Mediterranean rays were investigated. Lipid levels of liver tissue of D. pastinaca, R. radula, R. clavata, T. marmorata were determined to be 80.21%, 53.73%, 45.57% and 45.26%, respectively; while lipid levels for muscle tissue were 1.62%, 1.31%, 1.20% and 1.43%, respectively. In the fatty acid composition of muscle tissues of the rays; ∑SFAs (total saturated fatty acids) levels were reported to be between 30.46% and 35.00%, ∑MUFAs (total saturated fatty acids) levels were 21.49% to 27.77%, ∑PUFAs (total polyunsaturated fatty acids) levels were 28.76% to 35.69%; while for liver tissues; ∑SFAs levels were reported to be between 25.76% and 31.15%, ∑MUFAs levels were 23.43% to 30.66%, ∑PUFAs levels were 21.86% to 30.54%. According to data of this current study, no potential toxic metals (Cr, As, Cd, Pb, Hg) were detected in the fish oils obtained from the tissues. Finally, it was showed that these fish had potential for fish oil production because of their having fat in the liver tissues and there were also no potential heavy metal in the both muscle oil and liver oil, being rather healthy.
Highlights
Fish is a crucial source of food for human health and digestible because of its long muscle fibers
D. pastinaca, R. radula, R. clavata, T. marmorata have been detected for some physical properties
We reported that the lipid levels were to be 80.21%, 53,73%, 45,57%, 45.26% in liver and 1.62%, 1.31%, 1.20%, 1.43% in muscle tissue for D. pastinaca, R. radula, R. clavata, T. marmorata, respectively
Summary
Fish is a crucial source of food for human health and digestible because of its long muscle fibers. The many studies have showed that PUFAs prevent and potentially alleviate cancer, nervous system, reproductive system and cardiovascular diseases. These fatty acids are well reported mainly in the prevention of those diseases by protecting cell-membrane fluidity, improving functions of vascular endothelial cells, reducing of mild hypertension, decreasing susceptibility to ventricular abnormal heart rhythms, diminishing secretion of proinflammatory cytokines by macrophages, inhibiting blood platelet aggregation (Wiktorowska-Owczarek et al, 2015). EPA and DHA, critical for human health, both play a crucial role in the prevention of a wide range of disorders such as cancer, coronary heart and cardiovascular diseases (Chan et al, 2005; Navarro-García et al, 2009; Navarro-García et al, 2014). There is increasing interest nowadays in fish lipids because of their PUFAs
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