Bioaccumulation of silver and its effects on biochemical parameters and histological alterations in an Indian major carp Labeo rohita

Extensive usage of silver in several applications may contaminate the freshwater compartment and affects the health status of aquatic organisms. In the present investigation, fingerlings of Indian major carp Labeo rohita were exposed (35 days) to sublethal concentrations of silver nitrate (AgNO3) an...

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Autores principales:	Chellappan Shobana, Basuvannan Rangasamy, Devan Hemalatha, Mathan Ramesh
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2021
Materias:	Metal Toxicity Tissue/organ Enzymes Ionoregulation Fish Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/bf325ec4e7dc4fdc8b6b9a421900589c
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spelling	oai:doaj.org-article:bf325ec4e7dc4fdc8b6b9a421900589c2021-11-16T04:11:07ZBioaccumulation of silver and its effects on biochemical parameters and histological alterations in an Indian major carp Labeo rohita2590-182610.1016/j.enceco.2020.10.006https://doaj.org/article/bf325ec4e7dc4fdc8b6b9a421900589c2021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2590182620300308https://doaj.org/toc/2590-1826Extensive usage of silver in several applications may contaminate the freshwater compartment and affects the health status of aquatic organisms. In the present investigation, fingerlings of Indian major carp Labeo rohita were exposed (35 days) to sublethal concentrations of silver nitrate (AgNO3) and bioaccumulation pattern, biochemical and histological alterations were evaluated. Initially, the median lethal concentration (LC 50) of silver nitrate to the fish Labeo rohita for 96 h was calculated and it was found to be 0.035 mg L−1. To assess the toxicity of ionic silver two sublethal concentrations (0.0035 mg L−1: 1/10th of LC 50 and 0.007 mg L−1; 1/5th of LC 50) were selected and the experiment was conducted for a period of 35 days. A considerable quantity of AgNO3 was accumulated in the gill, liver and kidney tissues of Labeo rohita. Accumulation of AgNO3 was high in liver tissue compared to other organs/tissue. Membrane-bound enzyme (Na+/K+/-ATPase) activity was inhibited in both the concentrations when compared with the control group. Likewise, plasma electrolytes (Na+, K+ and Cl−) level were significantly decreased when compared with untreated groups. On the other hand, a noticeably increased level of glucose was observed in fish exposed to 0.0035 and 0.007 mg L−1 of AgNO3. Moreover, declining protein level was assessed during the initial days (7 and 14 days), and the level was increased in the rest of the exposure period. Extensive histopathological abnormalities were noticed in gill (hyperplasia, epithelial lifting, curling of lamellae) and liver (degeneration of hepatic nucleus, vacuolization, hepatic necrosis) of fish treated with silver nitrate when compared to control groups. The results obtained in the present study revealed that the bioaccumulation pattern, alterations in membrane-bound gill-ATPase activity, plasma electrolytes, biochemical and histological parameters of fish can be useful for biomonitoring the changes in the environment and health condition of fish in freshwater ecosystem contaminated with silver.Chellappan ShobanaBasuvannan RangasamyDevan HemalathaMathan RameshKeAi Communications Co., Ltd.articleMetalToxicityTissue/organEnzymesIonoregulationFishEnvironmental technology. Sanitary engineeringTD1-1066ENEnvironmental Chemistry and Ecotoxicology, Vol 3, Iss , Pp 51-58 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Metal Toxicity Tissue/organ Enzymes Ionoregulation Fish Environmental technology. Sanitary engineering TD1-1066
spellingShingle	Metal Toxicity Tissue/organ Enzymes Ionoregulation Fish Environmental technology. Sanitary engineering TD1-1066 Chellappan Shobana Basuvannan Rangasamy Devan Hemalatha Mathan Ramesh Bioaccumulation of silver and its effects on biochemical parameters and histological alterations in an Indian major carp Labeo rohita
description	Extensive usage of silver in several applications may contaminate the freshwater compartment and affects the health status of aquatic organisms. In the present investigation, fingerlings of Indian major carp Labeo rohita were exposed (35 days) to sublethal concentrations of silver nitrate (AgNO3) and bioaccumulation pattern, biochemical and histological alterations were evaluated. Initially, the median lethal concentration (LC 50) of silver nitrate to the fish Labeo rohita for 96 h was calculated and it was found to be 0.035 mg L−1. To assess the toxicity of ionic silver two sublethal concentrations (0.0035 mg L−1: 1/10th of LC 50 and 0.007 mg L−1; 1/5th of LC 50) were selected and the experiment was conducted for a period of 35 days. A considerable quantity of AgNO3 was accumulated in the gill, liver and kidney tissues of Labeo rohita. Accumulation of AgNO3 was high in liver tissue compared to other organs/tissue. Membrane-bound enzyme (Na+/K+/-ATPase) activity was inhibited in both the concentrations when compared with the control group. Likewise, plasma electrolytes (Na+, K+ and Cl−) level were significantly decreased when compared with untreated groups. On the other hand, a noticeably increased level of glucose was observed in fish exposed to 0.0035 and 0.007 mg L−1 of AgNO3. Moreover, declining protein level was assessed during the initial days (7 and 14 days), and the level was increased in the rest of the exposure period. Extensive histopathological abnormalities were noticed in gill (hyperplasia, epithelial lifting, curling of lamellae) and liver (degeneration of hepatic nucleus, vacuolization, hepatic necrosis) of fish treated with silver nitrate when compared to control groups. The results obtained in the present study revealed that the bioaccumulation pattern, alterations in membrane-bound gill-ATPase activity, plasma electrolytes, biochemical and histological parameters of fish can be useful for biomonitoring the changes in the environment and health condition of fish in freshwater ecosystem contaminated with silver.
format	article
author	Chellappan Shobana Basuvannan Rangasamy Devan Hemalatha Mathan Ramesh
author_facet	Chellappan Shobana Basuvannan Rangasamy Devan Hemalatha Mathan Ramesh
author_sort	Chellappan Shobana
title	Bioaccumulation of silver and its effects on biochemical parameters and histological alterations in an Indian major carp Labeo rohita
title_short	Bioaccumulation of silver and its effects on biochemical parameters and histological alterations in an Indian major carp Labeo rohita
title_full	Bioaccumulation of silver and its effects on biochemical parameters and histological alterations in an Indian major carp Labeo rohita
title_fullStr	Bioaccumulation of silver and its effects on biochemical parameters and histological alterations in an Indian major carp Labeo rohita
title_full_unstemmed	Bioaccumulation of silver and its effects on biochemical parameters and histological alterations in an Indian major carp Labeo rohita
title_sort	bioaccumulation of silver and its effects on biochemical parameters and histological alterations in an indian major carp labeo rohita
publisher	KeAi Communications Co., Ltd.
publishDate	2021
url	https://doaj.org/article/bf325ec4e7dc4fdc8b6b9a421900589c
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Bioaccumulation of silver and its effects on biochemical parameters and histological alterations in an Indian major carp Labeo rohita

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