Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 23 ISSUE 1
Written by Tarek FOUDA, Abd-Elrahman ELRAYES, Abd-Elhameed ELHANAFY

This study examined the impact of applying the optimum operating condition for fine bubbles aeration of 0.554 m³.h^-1 air flow rate, tube depths from the water surface of 0.7 m, tube inner diameter of 11 mm, and circular design shape at aquaculture greenhouse for rearing Nile Tilapia and compared with conventional water change system in three replicates for every treatment. For the classic water change method and fine bubbles, the corresponding water change ratios were 10 and 30, respectively. Before reaching commercial size, the experiment lasted for 8 weeks. Biological indicators estimated for blood, blood bio-chemical, digestive enzymes, anti-oxidant enzymes and serum bio-chemical parameters. Aeration method has a significant effect on red blood cells (Rbcs) where P value was 0.033. Also, a significant effect obtained on hemoglobin content (HB) where P value is 0.04. fine bubbles aeration has highest value of total protein by 4.93 g/dl compared with 4.46 g/dl for water change treatment. Amylas mean values were 21.047 and 12.307 U/L for fine bubbles aeration and water change treatment, respectively. mean values for SOD were 8.87 and 8.187 U/gm, CAT were 10.617 and 10.367 U/gm and MDA mean values were 12.93 and 18.367 nmol/g for fine bubbles aeration and water change treatment, respectively.

[Read full article] [Citation]