| Popis: |
The parameters of water quality, productive performance and economic viability were evaluated in tambaqui juveniles fed with different levels (0, 15, 25 and 35%) of Brazil nut meal (BNM). The water parameters measured were: surface temperature (TEMP), dissolved oxygen (OXY), hydrogenic potential (pH), total ammonia (AMO), alkalinity (ALK), hardness (HAR) and nitrite (NIT). Weight gain (WG), specific growth rate (SGR), feed intake (FI), apparent feed conversion (AFC), condition factor (K), daily feed intake (DFI) and daily weight gain (DWG) was avaluated. The cost of feed per kilogram consumed (CF US$/kg), cost of feed per kilogram of live weight gain (CF kg/LWG), economic efficiency index (EEI) and cost index (CI) were evaluated. TEMP, AMO, NIT, HAR did not differ (P>0.05), the means were 26.8°C, 0.16 mg L-1, 0 mg L and 17.8 mg L-1, respectively. The pH differed (P |
