Assessment of a high protein distillers dried grain (HP-DDG) augmented with phytase in diets for European sea bass, Dicentrarchus labrax fingerlings on growth performance, haematological status, immune response and related gut and liver histology. Aquaculture.

An experimental study was conducted to evaluate the effect of three different natural growth promoters as feed additives on growth performance of monosex Nile tilapia fingerlings. Three nutritional treatments were applied at two additive levels (0.15 & 0.3 %) of Paprika (Hot Red Pepper "Capsicum annuum" meal), Proplis (Bee Glue) and Humapol-FIS Substance (Humic & Fulvic acids with Mixture of Minerals) each one in addition to Control diet. The tested treatments were conducted in two cement ponds (8×4×1 m), divided with nets to 16 equal aquatic compartments (2×2×1 m); 14 of them were used and stocked randomly with 20 fish/each one with an average initial body weight of 23.62 ± 0.13 g. The experiment lasted for 20 weeks (Six feeding days/week with the feeding rate at 3% of live body weight/day). The results at the end of the experiment showed that, growth performance and feed conversion ratio were significantly (P< 0.05) improved for monosex tilapia fingerlings fed on diets with the aforementioned natural feed additives compared to fish fed on the control diet. Feed cost required to produce 1kg weight gain compared to fish fed on the control diet was reduced by using the feed additives. These results revealed that using Proplis (P) at a dietary additive level of 0.3 % was the best treatment in terms of growth performance and feed utilization, while the highest revenue and the best economic evaluation were obtained from the Paprika (K) diet at a level of 0.3 % compared to the control diet.

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Protein level Lipid level Liver enzyme activities Growth performance Digestibility coefficient A feeding trial was designed to assess the effects of dietary protein and lipid content on growth, feed utilization efficiency, and muscle proximate composition of Solea aegyptiaca juveniles. Eight diets were formulated (4 protein levels; 40, 45, 50& 55% at 2 lipid levels; 8, 12%). The results showed that growth performance in terms of weight gain, specific growth rate, condition factor, feed conversion ratio, protein efficiency ratio and net protein utilization were much higher for fish group fed on a diet contained 45% protein at 12% lipid than the rest of experimental groups. The feed intake of experimental fish tended to reduce with rising dietary lipid levels. No significant differences in Solea aegyptiaca for digestibility coefficient and body chemical composition were observed. The body content of lipid and liver enzymes (alanine aminotransferase and aspartate aminotransferase) activities were positively correlated with dietary lipid levels. The present results pointed to the diet containing 45%protein and 12% lipid with 22.5 MJ/kg-1 had a protein-sparing effect and was optimal for Solea aegyptiaca juveniles.

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