S. El-sayed, H., M. El-khodary, G. (2019). Impact of Copper and Cadmium on the Nutritional Value of the Rotifer Brachionus plicatilis and their Effect on Dicentrarchus labrax Fish Larvae.. test, 23(2), 491-503. doi: 10.21608/ejabf.2019.33919
Heba S. El-sayed; Gihan M. El-khodary. "Impact of Copper and Cadmium on the Nutritional Value of the Rotifer Brachionus plicatilis and their Effect on Dicentrarchus labrax Fish Larvae.". test, 23, 2, 2019, 491-503. doi: 10.21608/ejabf.2019.33919
S. El-sayed, H., M. El-khodary, G. (2019). 'Impact of Copper and Cadmium on the Nutritional Value of the Rotifer Brachionus plicatilis and their Effect on Dicentrarchus labrax Fish Larvae.', test, 23(2), pp. 491-503. doi: 10.21608/ejabf.2019.33919
S. El-sayed, H., M. El-khodary, G. Impact of Copper and Cadmium on the Nutritional Value of the Rotifer Brachionus plicatilis and their Effect on Dicentrarchus labrax Fish Larvae.. test, 2019; 23(2): 491-503. doi: 10.21608/ejabf.2019.33919

Impact of Copper and Cadmium on the Nutritional Value of the Rotifer Brachionus plicatilis and their Effect on Dicentrarchus labrax Fish Larvae.

Egyptian Journal of Aquatic Biology and Fisheries
Article 36, Volume 23, Issue 2, April 2019, Pages 491-503    PDF (948.5 K)
Document Type: Original Article
DOI: 10.21608/ejabf.2019.33919
Authors
Heba S. El-sayed; Gihan M. El-khodary
Abstract
Brachionus plicatilis is a rotifer that considered an important live feed in aquaculture for feeding the initial stages of many fish larvae. This study aimed to determine the growth, survival rate and biochemical alterations of Dicentrarchus labrax (sea bass) larvae fed on B. plicatilis treated with sublethal concentrations of cadmium chloride (CdCl2) and copper sulphate (CuSO4). This study is extended to evaluate the alteration in the nutritional value of B. plicatilis upon the exposure to sublethal doses of these heavy metals. The results showed that the   total length and width means of D. labrax larvae reared on B. plicatilis exposed to CuSO4 and CdCl2 increased significantly when compared to their control (p< 0.05.). D. labrax larvae fed on rotifers treated with CuSO4 and CdCl2showed a significant decrease in their survival percentages (p < 0.001) and their total lipids and protein levels (p < 0.001) when compared to their control. Moreover, the level of carbohydrate and lipid decreased significantly (p < 0.05) in the B. plicatilis exposed to sublethal concentration of CdCl2 and CuSO4. Most of the essential and nonessential amino acids in B. plicatilis exposed to these heavy metals were partially decreased while methionine, phenylalanine, histidine and leucine showed significant increase. Treating B. plicatilis with CdCl2 showed a significant decrease in mono and poly unsaturated fatty acids. The oleic acid ((C20:1 ω9) and the caprylic acid (C8:0) decreased in B. plicatilis exposed to CdCl2 and CuSO4, while the Eicosatrienoic acid (C 20:3ω3) and the Eicosapentaenoic acid (C 20:5ω3) were not detected. The Arachidonic acid (C20:4 ω6) decreased significantly in treated B. plicatilis with CdCl2.  The present work concluded that, D. labrax larvae feeds on B. plicatilis exposed to sublethal concentration of Cd and Cu heavy metals showed marked effect on the survival rate and biochemical composition.
Keywords
Brachionus plicatilis; Dicentrarchus labrax; Heavy metals; cadmium; copper; Nutritional Value; biochemical parameters
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