The relationship between the mean Fulton’s condition and form factors of 12 marine species (N=209 fish specimens) caught in the Zadar area (middle eastern Adriatic) was analysed. The lowest mean condition factor (K = 0.6329) referred to the elongated Trachinus draco, while the highest one (K = 1.7758) referred to the deep-bodied Scorpaena porcus. The correlation between the mean Fulton’s condition and form factors of these 12 populations was highly significant (K = 0.404 + 0.663 a3.0; r2 = 0.815; P < 0.01). Including more species in the calculation would give even more accurate results.