FE values among treatments within each trial were extremely similar, differing by no more than 0.1 in either trial. High feed efficiencies such as these are not uncommon in cobia. Chou el al (2001) reported a feed conversion ratio (FCR as: grams of dry feed/ grams of wet fish gain) of 1.09 in similar sized fish fed a 52% crude protein diet. Feed efficiencies in the present study represent FCRs ranging from 0.95-0.88 among all trials and treatments.