____________________________________________________________________________________________ *Corresponding author: Email: mineper@yahoo.com; Annual Research & Review in Biology 4(16): 2628-2633, 2014 SCIENCEDOMAIN international www.sciencedomain.org Seasonal Variation in Major Minerals (Ca, P, K, Mg) and Proximate Composition in Flesh of Mesopotamian Catfish (Silurus triostegus Heckel, 1843) from Turkey Mine Perçin Olgunoglu 1* , Ilkan Ali Olgunoğlu 1 and Mustafa Göçer 1 1 Department of Aquaculture and Fisheries Program, Kahta Vocational Training School, Adıyaman University, Turkey. Authors’ contributions This work was carried out in collaboration between all authors. Author MPO designed the study, wrote the protocol and wrote the first draft of the manuscript. Author İAO collected the samples, worked in the practical part. Author MG performed the statistical analysis and managed the literature searches. All authors read and approved the final manuscript. Received 15 th January 2014 Accepted 6 th March 2014 Published 28 th April 2014 ABSTRACT In this study, the seasonal variation on selected major minerals (Ca, P, K, Mg) and proximate composition of Mesopotamian catfish (Silurus triostegus Heckel, 1843) were investigated. Fish samples used in this research were obtained seasonally from Atatürk Dam Lake within the boundries of Turkey (37ºC45N’ latitude/38ºC17E’ longitude) via fishing. The mean value of Ca, P, K and Mg were determined as 92.59±9.81μg/g, 1447.56±117.38μg/g, 2762.50±418.00μg/g and 227.26±39.79μg/g (wet weight) respectively. The highest mineral contents were identified in summer. The highest crude protein was observed in autumn (18.88%) and the lowest in winter (16.88%).The average lipid content was identified between 4.22-6.56% and the highest value was observed in winter. The results showed significant differences between the four seasons (P<0.05) in major minerals and proximate composition. Keywords: Mesopotamian catfish; Silurus triostegus; minerals; proximate composition. Short Communication