The moisture, ash, protein and fat content and amino acid, fatty acid and mineral compositions in the flesh of three commercially important fish species (Dicentrarchus labrax, Sparus aurata, Dentex dentex) from the aqua culture of Turkey were evaluated. Ranges of moisture, ash, protein and fat contents were 69.68-76.42%, 1.49-1.95%, 18.21-21.70% and 2.29-8.10%, respectively. Among them, those occurring in the highest proportions were aspartic acid (3238.91-5204.71 mg/100 g), glutamic acid (5256.60-5810.43 mg/100 g), arginine (198.07-414.91 mg/kg), phenylalanine (50.51-386.96 mg/100 g), leucine (375.84-574.94 mg/100 g) and lysine (3089.71-4711.98 mg/100 g). The fatty acid compositions of sea bass (D. labrax), sea bream (S. aurata) and common dentex (D. dentex) ranged from 28.01% to 32.41% saturated, from 25.88% to 28.62% monounsaturated, and from 24.75% to 27.42% polyunsaturated. The highest potassium, magnesium, phosphorus, iodine and selenium contents were found in these fishes.