In the present study, proximate composition and meat yield of discarded fish Tub gurnard (Chelidonichthys lucerna Linnaeus, 1758), brown comber(Serranus hepatus Linnaeus, 1758) and Scaldfish (Arnoglosus laterna Walbaum, 1792) caught in Mersin Bay (Northeastern Mediterranean) by bottom trawlers were investigated. The highest protein values and the lowest total lipid and ash values were recorded during spring in three species (P<0.05). Meat yield was found to be different significantly among spring and autumn samples (P<0.05). Mean meat yield of tub gurnard, brown comber and scaldfish were 50.94%, 53.85% and 64.56%, respectively. Results of study show that although these species are considered to be discarded, they can be considered as food or additive for various living groups due to their high nutritional quality, thus they can contribute significantly to the food requirement and economy of the country. Thus, both the ecological balance in the marine environment will be protected and economic losses will be prevented.