Effect of different dietary protein-energy ratio on growth, feed utilization, body composition and haematological indices of European sea bass, Dicentrarchus labrax fingerlings

Abstract

This study was conducted to investigate the effect three dietary protein energy ratio on growth performance, feed utilization and haematological indices of European sea bass Dicentrarchus labrax fingerlings culture in net enclosures (hapa, 30 m-3 each) for 60 days. The experimental treatments were assigned in triplicate. Three test diets were formulated to contain three different protein levels (450, 500, and 550 g kg-1 diet) and three lipid levels (174, 160 and 150 g kg-1 diet) to provided three different dietary protein: energy ratio (P: E ratio: 20 , 23 and 25 mg CP kJ-1 GE g-1 , P:E21, P:E23 and P:E25, respectively). A total of 180 European sea bass, Dicentrarchus labrax with an average initial body weight of 13.0 ± 0.5 g fish-1 were randomly distributed into nine net enclosures measuring (3 × 8 ×1.25m each) at a stocking density of 20 fish per net enclosure. Over the 60-days feeding period, growth, feed utilization efficiency and survival (%) of D. labrax fingerlings was improved significantly (P>0.05) with increasing dietary protein energy ratio up to P:E23 compared to P:E25 diets. The same trend was observed for the best feed conversion ratio (FCR). No statistical difference (P ≥ 0.05) was observed for the influence of dietary protein energy ratio on whole body proximate analysis of fish except for protein which recorded the highest values for fish fed P:E23 diet. Mean red blood cell counts (RBCs), mean white blood cell counts (WBCs), hematocrit (Hct), hemoglobin (Hb), total plasma protein, total plasma globulin, plasma

A Systematic Review and Meta-Analysis of Basal and Post-Stress Circulating Cortisol Concentration in an Important Marine Aquaculture Fish Species, European Sea Bass, Dicentrarchus labrax

“…), (Eli3) used the individuals and not the tanks as experimental units and, therefore, presented the results as an average of individuals and not tanks, and (Eli4) it was possible to attribute the data to control or post-stress conditions. After this stage, 8 research items were excluded ([ 16 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]; Table S2 ), and the remaining 69 items were used in the meta-analysis.…”

Growth, Feed Utilization, Blood Biochemical Variables, Immunity, Histology of the Intestine, Gills and Liver Tissues, and Carcass Composition of the European Seabass (Dicentrarchus labrax) Raised Using Different Water Sources

“…However, they disagree with those reported for meagre fish (Abdel-Rahim et al, 2019). The higher levels of these enzymes in T3 compared to T1 and T2 may be due to the reduced salinity of the water and the presence of pollutants, which resulted in an increased metabolic rate during osmoregulation and stress (Goda et al, 2019).…”