Performance and nutrient utilization in South American juvenile catfish Pseudoplatystoma spp. weighting 89 - 170g, fed at different energy and protein levels

Abstract

Performance and nutrient utilization in South (18.0, 18.8, 19.6, 20.5, 21.3MJ/kg). No segundo experimento, os juvenis (170,03±3,35g) foram alimentados com dietas contendo cinco níveis de proteína (360, 400, 440, 480 e 520g/kg

Dietary protein:lipid ratio changes growth, digestive enzyme activity, metabolic profile and haematological parameters in hybrid surubim (Pseudoplatystoma fasciatum × Leiarius marmoratus)

“…This effect was observed after 20 days and lasted for the 60-day trial period, showing different nutrient utilization by the different treatment groups over time. This early response to dietary treatments has also been observed in trials with fish of different feeding behaviours (Johansen et al, 2011;Karalazos et al, 2011;Teixeira et al, 2013). When feed consumption decreases, all growth parameters were affected due to low nutrient intake.…”

“…Studies that evaluate protein:lipid ratios commonly analyse growth and nutrient utilization (Arslan et al., ; Karalazos, Bendikasen & Bell, ; Liu et al., ; Teixeira et al., ). However, studies that show growth performance, nutrient utilization, digestibility, enzyme activities and metabolic responses provide more robust information of how fish metabolism responds to different protein:energy ratios and physiological adaptation as a whole.…”