Summary The study objective was to investigate the profiles of tocopherol, heavy metals, and fatty acids in the liver oil of female and male thornback ray Raja clavata from the Black and Mediterranean seas. The fish liver oil analyses were carried out by using a spectrophotometer (Hitachi U‐1900), ICP‐AES (Inductively Coupled Plasma‐Atomic Emission Spectrometry, and a GC‐MS (gas chromatography‐mass spectrometry), respectively. Results showed that the tocopherol content differed between the sample origin and gender (range of 42.3–134.5 mg kg−1). Pb, Cd, and Mn contents in livers of all R. clavata were lower than for Cu, Fe, and Zn. Levels of 7.6 and 8.9% in the eicosapentaenoic acid (EPA) were found to be higher in Black Sea thornback rays than in Mediterranean specimens (4.5 and 5.8%) (P < 0.05). All thornback ray liver oils contained large amounts of docosahexaenoic acid (DHA) in the range of 19.9–26.1%.

Lipid, moisture, fatty acid, and mineral contents of gold band goatfish (Upeneus moluccensis) (Bleeker, 1855) and striped red mullet (Mullus surmuletus) (Linnaeus, 1758) were investigated. The lipid and moisture contents in the two species were found to be significantly different from each other (P<0.05). Lipids of striped red mullet include significantly (P<0.05) higher levels of C14:0, C15:0, C16:1, C17:1, C18:1n9, C18:2n6, C20:3n6, DHA (Docosahexaenoic Acid, C22:6n3) and EPA (Eicasapentaenoic Acid, C20:5n3) fatty acids than those of gold band goatfish. Proportions (%) of SFA (Saturated Fatty Acid), MUFA (Monounsaturated Fatty Acid), and PUFA (Polyunsaturated Fatty Acid), DHA/EPA, and n3/n6 were found to be 39. 30, 26.81, 32.18, 3.26, and 5.35 for gold band goatfish and 36.72, 41.83, 18.92, 0.89, and 3.31 for striped red mullet, respectively. K and P were found to be predominant among the 11 measured minerals in the two species. Only the K, Ca, and Na content of the two fish species were found to be significantly different (P<0.05).Keywords: Upeneus moluccensis, Mullus surmuletus, minerals, fatty acids, lipid content, gold band goatfish, striped red mullet. Keywords: Paşa Barbunu ve Tekir Balığının Yağ Asitleri Komposizyonları ve Mineral Madde İçerikleri ÖzetBu çalışmada paşa barbunu veya Nil barbunu (Upeneus moluccensis, Bleeker, 1855) ve tekir balığının (Mullus surmuletus, Linnaeus, 1758) toplam yağ, nem, kül, yağ asitleri kompozisyonunu ve mineral madde içerikleri incelenmiştir. Bu iki türe ait yağ ve nem içerikleri birbirinden önemli derecede farklı bulunmuştur (P<0,05). Çalışmanın sonuçları tekir balığı yağında bulunan C14:0, C15:0, C16:1, C17:1, C18:1n9, C18:2n6, C20:3n6, DHA (Dokosahekzaenoik Asit, C22:6n3) ve EPA (Eikosapentaenoik Asit, C20:5n-3) yağ asitleri seviyelerinin paşa barbunu yağında bulunandan daha yüksek miktarlarda olduğunu göstermiştir (P<0,05). SFA (Doymuş Yağ Asitleri), MUFA (Tekli Doymamış Yağ Asitleri), PUFA (Çoklu Doymamış Yağ Asitleri), DHA /EPA ve n3/n6 miktarlarını (%) sırası ile paşa barbununda 39,30, 26,81, 32,18, 3,26 ve 5,35 ve tekir balığında ise 36,72, 41,83, 18,92, 0,89 ve 3,31 olduğu tespit edilmiştir. İncelenen mineraller içerisinden K ve P değerleri her iki türde en yüksek miktarlarda bulunmuştur. Bu iki tür balıkta incelenen minerallerden yalnızca K, Ca ve Na seviyelerindeki farklılık istatistiksel açıdan önemli bulunmuştur (P<0,05).Anahtar Kelimeler: Upeneus moluccensis, Mullus surmuletus, mineraller, yağ asitleri, yağ içeriği, paşa barbunu, tekir balığı.

Element compositions, fatty acid profiles, lipid levels, and proximate compositions of marbled spinefoot and dusky spinefoot from Northeastern Mediterranean Sea/Turkey were evaluated. Amounts of K and P of both fish were calculated as the predominant elements among the 11 and followed by Na, Mg, and Ca in this study. Apart from the copper, micro elements composition did not change significantly in both species. Saturated fatty acids (SFA), polyunsaturated fatty acids (PUFA) and monounsaturated fatty acids (MUFA) levels were the predominant fatty acids in both species respectively. Linoleic (n6) acid and linoleic (n3) acid levels were significantly higher in dusky spine foot than marbled spine foot. The ratio of DHA/EPA in marbled spinefoot and dusky spinefoot were calculated as 3.58 and 1.82, respectively. Lipid content of dusky spine-foot was significantly (P< 0.05) higher than that of marbled spine-foot, although moisture contents of both fish were almost the same. Çarpan (Siganus rivulatus, Forsskal, 1775) ve Tavşan (Siganus luridus, Ruppell, 1878) Balıklarının Element Kompozisyonları, Yağ Asitleri Profilleri ve Besin BileşenleriKuzeydoğu Akdeniz bölgesinde bulunan çarpan ve tavşan balıklarının element komposizyonları, yağ asitleri profilleri ve besin bileşenleri incelenmiştir. Bu iki balığa ait K ve P seviyeleri incelenen 11 element içersinde en yüksek miktarlarda olduğu ve bunları sodyum, mağnezyum ve kalsiyum elementlerinin takip ettiği gözlenmiştir. Belirlenen mikro elementler içinde yalnız bakır miktarı önemli derecede tavşan balığında, çarpan balığından yüksek bulunmuştur. Her iki türde de en yüksek yağ asitleri doymuş yağ asitleri (SFA) olurken, bunları çoklu doymamış (PUFA) ve tekli doymamış yağ asitleri (MUFA) izlemiştir. Linoleik ve linolenik yağ asitleri tavşan balığında diğer türe göre daha yüksek bulunmuştur. Çarpan ve tavşan balığına ait DHA/EPA oranları sırası ile 3.58 ve 1.82 olarak hesaplanmıştır. Tavşan balığının yağ içeriği çarpan balığından önemli miktarda (P< 0.05) yüksek ve bu iki balığa ait nem miktarları ise hemen hemen aynı bulunmuştur.

The study objective was to investigate the chemical composition of otoliths of two Lessepsian fish migrants, namely, Champsodon nudivittis and Nemipterus randalli, which thrive in the Iskenderun Bay, Turkey. The study specifically investigated the age structure and explored differences in chemical otolith composition in relation to age. Samples were collected using a traditional Mediterranean bottom trawl (mesh size 44 mm) at depths of 45 to 90 m. A total of 78 Champsodon nudivittis (size range, 6.0 to 14.0 cm) and 60 Nemipterus randalli (size range, 6.1 to 17 cm) were captured in May 2012. Age readings were carried out (sectioning technique). Additionally, the concentrations of Na, K, Li, and Ca were determined using flame photospectrometry. The results revealed that the concentrations of Na (5.70 mg/g) and K (4.45 mg/g) in otoliths of Nemipterus randalli were predominant elements after Ca (128.71 mg/g). The concentration of Li in otoliths was also statistically different in the two species. This study contributes to the knowledge of the otolith chemistry in the two Lessepsian fish species now living in the same (but new) geographical region.

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