EFFECT OF SODIUM CARBONATE ON LEAD AND ZINC TOXICITY AND ITS EFFECT ON GROWTH PERFORMANCE, FEED UTILIZATION, BIOACCUMULATION AND BIOCHEMICAL CONSTITUENTS IN OREOCHROMIS NILOTICUS

Mohamed k. Khames1;
Mohamed M. Zenhom1

and Mahmoud A. Metwally2

Fish Nutrition Department 1 and Physiology Department 2, Central Laboratory for Aquaculture Research, Agriculture Research Center, Egypt.

Received 29 /3 /2020

Accepted 28 /4 /2020

ABSTRACT

This study evaluated the effect of sodium carbonate on chronic exposure of water Lead (Pb) and Zinc (Zn) toxicity on O. niloticus growth performances, feed utilization bioaccumulation and biochemical constituents. 210 Tilapia niloticus were divided into seven groups each group with three replicates. The group1 (G1) untreated group served as control group, group2 (G2) exposure to concentrations (10 and 20 mmol/L) lead and zinc respectively, group3 (G3) exposure to (15 and 30 mmol/L) lead and zinc respectively, group4 (G4) exposure to (20 and 40mmol/L) lead and zinc respectively, but groups (G5, G6 and G7) exposure to 10 mmol/L of Na2CO3 with the same previous concentration of lead and zinc. Each aquarium was containing 10 fish (20.3±0.01g / fish) and the experiments expanded two month. The growth parameters were affected by lead and zinc concentration. High growth performance and feed utilization (WG, SGR, RGR, FCR, PER, PPV, and FI) showed at control group and low concentrations lead and zinc exposure one. Bioaccumulation of lead and zinc increase with increasing concentration exposure dose. Erythrocyte count (RBCs), hemoglobin content (Hb) and hematocrit value (Hct) were significantly affected by high lead and zinc concentrations compared to control one. Blood glucose, Aminotransferase (AST&ALT) activity, total protein, and total lipids were significantly affected by lead and zinc concentration compared to control group. Overall results presented after adding of Na2CO3 indicate that improve the growth performance, feed utilization, biochemical constituents and bioaccumulation decrease in tilapia fish.

Keywords:
Oreochromis niloticus, bioaccumulation, growth, lead, zinc and Na2CO3.

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