performance and phosphorus availability was investigated in hybrid (F1), female red sea bream × male black sea bream. Six diets were formulated: as fish meal (FM) 46% (control), FM 15% + SBM 40% (SP0), and 1000, 2000, 3000 and 4000 phytase activity units/kg in SP0 diet (SP1000, SP2000, SP3000 and SP4000, respectively). Ten juvenile F1 with
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