Habi̇b BAL, Selim ESEN

Preliminary study on otolith chemistry and otolith morphology of two demersal fish species, European hake (Merluccius merluccius Linnaeus, 1758) and striped red mullet (Mullus surmuletus Linnaeus, 1758) in the Sea of Marmara

Otoliths are calcium carbonate (CaCO3) accumulations. Under the influence of different ecosystems morphological and chemical composition change. In this study, economically important two demersal fish species; European hake Merluccius merluccius (Linnaeus, 1758) and Stripet red mullet (Mullus surmuletus Linnaeus, 1758) was examined. Otoliths (Sagitta) belonging to these two species have been studied both chemically and morphologicall. Morphometric measurements of otoliths (length, mm; width, mm; area, mm2; perimeter, mm) in the sagittal of each species was made by the Leica M125 tri-ocular microscope. In the chemical analysis of otoliths, strontium (Sr), magnesium (Mg) and calcium (Ca) trace element amounts, the ratios of Sr and Mg trace elements to Ca element (Sr/Ca and Mg/Ca) were determined. For the micro-chemical analysis of otoliths ICP-MS was used. The highest magnesium (24.92±9.57 mmol/mol) and strontium (26.17±1.81 mmol/mol) element values were found in the otolith of red mullet. The difference between strontium (Sr) and magnesium (Mg) amounts for two fish species was found to be significant (P<0.05). In addition to it was found that the difference between them in the amount of calcium is significant (P<0.001). The shape indexes of otoliths are significantly different between the two fish species. Especially in terms of roundness (RD) and aspect ratio (AR) (P<0.001). The results of this study provide information about the habitats of two economic importance demersal fish species. Since such studies can give information about the habitat areas of fish species, they are important for tracking stocks, migration routes and sustainable fisheries.

Marmara Denizi’nde iki demersal balık türünün bakalyaro (Merluccius merluccius Linnaeus, 1758) ve tekir (Mullus surmuletus Linnaeus, 1758)’in otolit kimyası ve otolit morfolojisi üzerine ön çalışma

Otolitler kalsiyum karbonat (CaCO3) birikimleridir. Farklı ekosistemlerin etkisi altında morfolojik ve kimyasal olarak değişmektedir. Bu çalışmada, ekonomik olarak önemli iki demersal balık türü; Bakalyaro Merluccius merluccius (Linnaeus, 1758) ve tekir (Mullus surmuletus Linnaeus, 1758) balığına ait otolitler (Sagitta) hem kimyasal hem de morfolojik olarak incelenmiştir. Otolitlerin (uzunluk, mm; genişlik, mm; alan, mm2; çevre, mm) morfometrik ölçümleri Leica M125 tri-oküler mikroskop ile yapılmıştır. Otolit yapısındaki stronsiyum (Sr), magnezyum (Mg) ve kalsiyum (Ca) iz element miktarları ile Sr ve Mg eser elementlerinin Ca elementine (Sr/Ca ve Mg/Ca) oranları belirlenmiştir. Otolitlerin mikro kimyasal analizi için ICP-MS kullanılmıştır. En yüksek magnezyum (24,92±9,57 mmol/mol) ve stronsiyum (26,17±1,81 mmol/mol) element değerleri tekir otolitinde tespit edilmiştir. İki balık türü için stronsiyum (Sr) ve magnezyum (Mg) miktarları arasındaki fark önemli bulunmuştur (P<0,05). Ayrıca kalsiyum miktarı açısından aralarındaki farkın oldukça önemli olduğu tespit edilmiştir (P<0,001). Otolitlerin şekil indeksleri iki balık türü arasında önemli ölçüde, özellikle yuvarlaklık (RD) ve en boy oranı (AR) açısından önemli olduğu tespit edilmiştir (P<0,001). Bu çalışmanın sonuçları, ekonomik önemi olan iki demersal balık türünün habitatları hakkında bilgi verdiğinden; stokları, göç yolları ve sürdürülebilir balıkçılığın takibi açısından önem arz etmektedir.

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