In this study, The ratio and density of Flounder (Platichthys flesus luscus Pallas, 1811) in different catch compositions in Trabzon-Rize coasts were examined. The mean quantity and ratio of flounder in trammel net catch composition was determined as 0.5 +/- 0.8 kg and 1.8%, in beach seine catch composition, 0.9 +/- 0.7 kg and 7.8 % respectively. In trawl catch composition in Trabzon and Rize coasts, mean quantity, ratios and density of flounder were determined as 0.85 +/- 0.4 kg, 0.4 %, 0.000054 kgm(-2) and 1.41 +/- 0.7, 2.0 %, 0.000033 kgm(-2) respectively. The density of flounder was 0.000038 kgm(-2) at the unit area. There was no any significant difference (p>0.05) between the flounder quantity in trawl catch compositions in Trabzon and Rize coasts.