Growth, biochemical variables, and zinc bioaccumulation in Nile tilapia, Oreochromis niloticus (L.) as affected by water-born zinc toxicity and exposure period
Abstract The present study was carried out to investigate the effect of sublethal zinc (Zn) concentrations on growth performance, biochemical variables, and Zn residues in various organs of Nile tilapia, Oreochromis niloticus (L.). Fish (25 ± 0.5 g) were exposed to 0.0, 3.5, or 7.0 mg Zn L−1 for 1 o...
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| Format: | Article |
| Language: | English |
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Islamic Azad University
2016-06-01
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| Series: | International Aquatic Research |
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| Online Access: | http://link.springer.com/article/10.1007/s40071-016-0135-0 |
| _version_ | 1818775872659783680 |
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| author | Mohsen Abdel-Tawwab Gamal O. El-Sayed Sherien H. Shady |
| author_facet | Mohsen Abdel-Tawwab Gamal O. El-Sayed Sherien H. Shady |
| author_sort | Mohsen Abdel-Tawwab |
| collection | DOAJ |
| description | Abstract The present study was carried out to investigate the effect of sublethal zinc (Zn) concentrations on growth performance, biochemical variables, and Zn residues in various organs of Nile tilapia, Oreochromis niloticus (L.). Fish (25 ± 0.5 g) were exposed to 0.0, 3.5, or 7.0 mg Zn L−1 for 1 or 6 weeks. Fish growth was significantly reduced with increasing Zn concentrations. However, fish exposed to 7.0 mg Zn L−1 grew less quickly than those of the control group. Likewise, best feed intake and feed conversion ratio were obtained at the control group. Furthermore, glucose, aspartate aminotransferase (AST), alanine aminotransferase (ALT), creatinine, and cortisol increased significantly with increasing Zn concentrations and exposure time, with maximal values in the 7.0 mg Zn L−1 treatment after 6 weeks. Meanwhile, highest values of serum protein and lipids were obtained in the control fish reared for 6 week, whereas their lowest values were observed in fish exposed to 7.0 mg Zn L−1 for 1 week. There was no significant change in whole-body moisture content of fish due to Zn exposure, although crude protein and total lipid contents decreased significantly with increasing Zn concentrations. In addition, Zn exposure increased total ash contents and Zn residues in different investigated fish organs. The Zn concentrations in all fish organs were time-dependant and the Zn residues after 1 week were found to follow the order of gills > liver > kidney > muscle, meanwhile after 6 weeks it followed the order of liver > kidney > gill > muscle. The present findings revealed that liver and kidney tissues are the prime sites of Zn bioaccumulation, while Zn load in the muscle was for low as compared to other organs. |
| first_indexed | 2024-12-18T11:03:57Z |
| format | Article |
| id | doaj.art-900cb890bbd04e058c2b3d52e7b3ca68 |
| institution | Directory Open Access Journal |
| issn | 2008-4935 2008-6970 |
| language | English |
| last_indexed | 2024-12-18T11:03:57Z |
| publishDate | 2016-06-01 |
| publisher | Islamic Azad University |
| record_format | Article |
| series | International Aquatic Research |
| spelling | doaj.art-900cb890bbd04e058c2b3d52e7b3ca682022-12-21T21:10:09ZengIslamic Azad UniversityInternational Aquatic Research2008-49352008-69702016-06-018319720610.1007/s40071-016-0135-0Growth, biochemical variables, and zinc bioaccumulation in Nile tilapia, Oreochromis niloticus (L.) as affected by water-born zinc toxicity and exposure periodMohsen Abdel-Tawwab0Gamal O. El-Sayed1Sherien H. Shady2Department of Fish Biology and Ecology, Central Laboratory for Aquaculture ResearchChemistry Department, Faculty of Science, Benha UniversityDepartment of Fish Biology and Ecology, Central Laboratory for Aquaculture ResearchAbstract The present study was carried out to investigate the effect of sublethal zinc (Zn) concentrations on growth performance, biochemical variables, and Zn residues in various organs of Nile tilapia, Oreochromis niloticus (L.). Fish (25 ± 0.5 g) were exposed to 0.0, 3.5, or 7.0 mg Zn L−1 for 1 or 6 weeks. Fish growth was significantly reduced with increasing Zn concentrations. However, fish exposed to 7.0 mg Zn L−1 grew less quickly than those of the control group. Likewise, best feed intake and feed conversion ratio were obtained at the control group. Furthermore, glucose, aspartate aminotransferase (AST), alanine aminotransferase (ALT), creatinine, and cortisol increased significantly with increasing Zn concentrations and exposure time, with maximal values in the 7.0 mg Zn L−1 treatment after 6 weeks. Meanwhile, highest values of serum protein and lipids were obtained in the control fish reared for 6 week, whereas their lowest values were observed in fish exposed to 7.0 mg Zn L−1 for 1 week. There was no significant change in whole-body moisture content of fish due to Zn exposure, although crude protein and total lipid contents decreased significantly with increasing Zn concentrations. In addition, Zn exposure increased total ash contents and Zn residues in different investigated fish organs. The Zn concentrations in all fish organs were time-dependant and the Zn residues after 1 week were found to follow the order of gills > liver > kidney > muscle, meanwhile after 6 weeks it followed the order of liver > kidney > gill > muscle. The present findings revealed that liver and kidney tissues are the prime sites of Zn bioaccumulation, while Zn load in the muscle was for low as compared to other organs.http://link.springer.com/article/10.1007/s40071-016-0135-0Nile tilapiaFish performanceBiochemical variablesZn toxicityZn bioaccumulationFish organs |
| spellingShingle | Mohsen Abdel-Tawwab Gamal O. El-Sayed Sherien H. Shady Growth, biochemical variables, and zinc bioaccumulation in Nile tilapia, Oreochromis niloticus (L.) as affected by water-born zinc toxicity and exposure period International Aquatic Research Nile tilapia Fish performance Biochemical variables Zn toxicity Zn bioaccumulation Fish organs |
| title | Growth, biochemical variables, and zinc bioaccumulation in Nile tilapia, Oreochromis niloticus (L.) as affected by water-born zinc toxicity and exposure period |
| title_full | Growth, biochemical variables, and zinc bioaccumulation in Nile tilapia, Oreochromis niloticus (L.) as affected by water-born zinc toxicity and exposure period |
| title_fullStr | Growth, biochemical variables, and zinc bioaccumulation in Nile tilapia, Oreochromis niloticus (L.) as affected by water-born zinc toxicity and exposure period |
| title_full_unstemmed | Growth, biochemical variables, and zinc bioaccumulation in Nile tilapia, Oreochromis niloticus (L.) as affected by water-born zinc toxicity and exposure period |
| title_short | Growth, biochemical variables, and zinc bioaccumulation in Nile tilapia, Oreochromis niloticus (L.) as affected by water-born zinc toxicity and exposure period |
| title_sort | growth biochemical variables and zinc bioaccumulation in nile tilapia oreochromis niloticus l as affected by water born zinc toxicity and exposure period |
| topic | Nile tilapia Fish performance Biochemical variables Zn toxicity Zn bioaccumulation Fish organs |
| url | http://link.springer.com/article/10.1007/s40071-016-0135-0 |
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