The present study is a preliminary work which was conducted to evaluate the impact of adding 3 levels of garlic (10, 20 and 30 g/kg diet) as well as onion powder (5, 10 and 20 g/kg diet) in a basal diet of sea bass (Dicentrarcus labrax) fry (initial weight = 0.4 ± 0.05 g/fish) on growth performance, feed utilization, body composition, survival rate and some hematological parameters. The present results suggested that dietary garlic or onion powder administrated separately at levels of 30 or 10 g/kg respectively could improve survival, growth and feed utilization of sea bass fry. Administration of garlic and onion indicates a slide edge for garlic to onion in growth, feed utilization and fish protein content. It will also induce a significant increase in some blood variables (hemoglobin content, hematocrit value, mean corpuscular volume, mean corpuscular hemoglobin and leukocytes count) in treated fish when compared to the control fish group. ª 2015 National Institute of Oceanography and Fisheries. Hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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A total of 360 monosex Oreochromis niloticus with an average body weight of 7.1±1 g were used. The fish were randomly divided into 8 equal triplicate groups (15 fish/replicate). A basal control diet was formulated to fulfil the nutrient requirements of the fish that contained 25% crude protein (CP) and 448.3 kcal/100 g. The other 7 diets (treatment diets) were supplemented with pomegranate peel (PP) at rates of 1, 2, 3, 5, 10, 15 and 20%. The fish were fed the diets 3 times daily at a rate of 5 to 7% of the body weight per day, 6 days a week for 90 days. Haematological analysis revealed that red blood cell (RBC) counts and haemoglobin levels (Hb) were significantly lower and that white blood cell (WBC) counts were significantly (P<0.01) higher in blood from fish fed the different PP-supplemented diets than in blood from fish fed the control diet. Glucose and total protein levels were increased after 90 days. Cholesterol levels were reduced by PP, while triglyceride levels were significantly increased. In addition, alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels were significantly reduced in the blood of monosex Nile tilapia fed diets with different concentrations of PP. Immunological parameters (IgM levels and lysozyme activity) were significantly improved by PP supplementation. These results indicate that addition of PP to monosex O. niloticus diets improved immune status and liver and kidney function without any adverse effects on health status.

The objective of the current study was to evaluate the growth performance, survival, feed utilization, whole body composition and biochemical blood parameters of Nile tilapia, Oreochromis niloticus and thinlip mullet, Liza ramada, fed diets supplemented with four levels of lemon peel (0, 0.5, 1 and 2%) in a polyculture system. The fish were stocked in 2×5×1 m concrete tanks at a density of 40 Nile tilapia (0.6 g) and 10 thinlip mullet (3.3 g) fingerlings per tank and were fed a pelleted diet (~25% Crude protein), twice daily for 77 days. Treatment with 2% lemon peel had significant positive effects on growth, feed utilization and total biomass of Nile tilapia, whereas 0.5% lemon peel was optimal for thinlip mullet. The blood parameter results showed thatNile tilapia fed 2% dietary lemon peel had the lowest triglyceride, amylase and glucose levels. In contrast, thinlip mullet fed 0.5% dietary lemon peel had the highest levels of amylase and glucose compared with the other groups.