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¹ Bingöl University, Faculty of Agriculture, Department of Fisheries, Bingöl, Turkey
² Bingöl University, Vocational School of Technical Sciences, Department of Veterinary Medicine, Bingöl, Turkey
³ Karadeniz Technical University, Surmene Faculty of Marine Sciences, Department of Marine Sciences and Technology Engineering, Trabzon, Turkey
⁴ Karadeniz Technical University, Marine Sciences and Technology Institute, Karadeniz Technical University, Trabzon, Turkey DOI : 10.4194/1303-2712-v17_2_09 Viewed : 3615 - Downloaded : 3247 Noctiluca scintillans reached the highest abundance (5105 ind/m³) in April; and April was an important period in the Black Sea ecosystem because of the seasonal thermocline. While the relationship between temperature and abundance was important (P<0.05, r²=-0.8), the relationship was not important between salinity and abundance (P<0.05, r²=-0.06); and Chlorophyll-a (Chl-a) and abundance (P<0.05, r²=-0.2). It was determined that total lipid was 0.5% in wet weight (WW). It was shown that the main Saturated Fatty Acids (SFA) were 16:0 (24%) and 18:0 (6%), main Monounsaturated Fatty Acids (MUFA) were 18:1ω-9c (22%) and 16:1ω-7 (4%), main Polyunsaturated Fatty Acids (PUFA) were 18:2ω-6c (19%) and 20:4ω-6c (8%). Phytosterols were the most important sterols in N. scintillans; and stigmasterol was 60 μg/gr and β-sterol was 8μg/gr as the most important ones in phytosterols. α-tocopherol was the highest amount (10.8 μg/g) in lipophilic vitamins. It was found that Malondialdehyde (MDA) was 65 μg/g, total protein was 10 mg/g, Glutathione (GSH) was 10565 μg/g and GSSG) was 49 μg/g. Consequently, PUFA and α-tocopherol were the most important biochemical parameters and α- tocopherol may reduce toxicity in blooms of N. scintillans because of inhibitory effect of α-tocopherol on lipid oxidation. Additionally, we can say that N. scintillans is a resistant dinoflagellate against oxidative stress. Keywords : PUFA, phytosterols, toxicity, lipid oxidation