Distribution And Accumulation Of Heavy Metals In Fish in Cage System in Linggi Estuary, Malaysia

Kuala Linggi is developing into potential aquaculture area in the west coast of Peninsular Malaysia but this area is facing ecological pressures. In Malaysia, data on heavy metals in aquaculture area and the cultured organisms are lacking. This study is aimed to evaluate the metal levels in fish...

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Main Author:	Yusof, Shahrizad
Format:	Thesis
Language:	English English
Published:	2005
Subjects:	Heavy metals Animal cages - Linggi Estuary - Malaysia
Online Access:	http://psasir.upm.edu.my/id/eprint/6270/1/FS_2005_41.pdf
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id	my-upm-ir.6270
record_format	uketd_dc
spelling	my-upm-ir.62702023-10-19T06:54:43Z Distribution And Accumulation Of Heavy Metals In Fish in Cage System in Linggi Estuary, Malaysia 2005-06 Yusof, Shahrizad Kuala Linggi is developing into potential aquaculture area in the west coast of Peninsular Malaysia but this area is facing ecological pressures. In Malaysia, data on heavy metals in aquaculture area and the cultured organisms are lacking. This study is aimed to evaluate the metal levels in fish cage ecosystem and to investigate the exposure route of metals to the cultured fish. Samples of three different sizes of cultured Nile tilapia (Oreochromis niloticus), river sediment, cage sediment, river water and periphyton were analysed for Cu, Zn, Cd and Pb content using atomic absorption spectrophotometer. The cultured fish Hg content was also determined using mercury analyser. Heavy metals (Cu, Zn, Cd, Pb and Hg) are present in the aquaculture area in Linggi Estuary. Concentrations of Cu and Zn in the Linggi River water in the estuary are below the standards outlined by the Malaysian Department of Environment, but Cd and Pb concentrations are above the standards. Sediment Cu and Zn concentrations are at safe levels but Cd and Pb concentrations are above threshold levels. Sediment Cu and Zn are due to anthropogenic origin while large percentage of Cd and Pb in the sediment occurs naturally. There is a similar trend of Cu, Zn, Cd and Pb accumulation in three components of the aquaculture area environment, the periphyton, the cage sediment and the river sediment. This reflects close relationship of these components in cycling of the heavy metals. These three components, plus the commercial fish feed contribute heavy metals to the cultured fish. Different metals accumulate in different organs of the cultured fish. Copper is concentrated in the liver, Zn in the bone, Pb in the operculum, Cd in the gills and Hg in the kidney. Copper, Zn, Cd and Pb were also found to accumulate with age of fish. With respect to Cu, Zn and Hg, the fish cultured in Linggi Estuary is safe for consumption but their Cd and Pb levels are above the permissible level set by the Malaysian Government. Elevated levels of these of nonessential elements may pose threats to human health through consumption of the fish. These results indicate that some measures should be taken to prevent the contamination of the estuarine environment for human and animal health. Heavy metals Animal cages - Linggi Estuary - Malaysia 2005-06 Thesis http://psasir.upm.edu.my/id/eprint/6270/ http://psasir.upm.edu.my/id/eprint/6270/1/FS_2005_41.pdf text en public masters Universiti Putra Malaysia Heavy metals Animal cages - Linggi Estuary - Malaysia Science Ismail, Ahmad English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
advisor	Ismail, Ahmad
topic	Heavy metals Animal cages - Linggi Estuary - Malaysia
spellingShingle	Heavy metals Animal cages - Linggi Estuary - Malaysia Yusof, Shahrizad Distribution And Accumulation Of Heavy Metals In Fish in Cage System in Linggi Estuary, Malaysia
description	Kuala Linggi is developing into potential aquaculture area in the west coast of Peninsular Malaysia but this area is facing ecological pressures. In Malaysia, data on heavy metals in aquaculture area and the cultured organisms are lacking. This study is aimed to evaluate the metal levels in fish cage ecosystem and to investigate the exposure route of metals to the cultured fish. Samples of three different sizes of cultured Nile tilapia (Oreochromis niloticus), river sediment, cage sediment, river water and periphyton were analysed for Cu, Zn, Cd and Pb content using atomic absorption spectrophotometer. The cultured fish Hg content was also determined using mercury analyser. Heavy metals (Cu, Zn, Cd, Pb and Hg) are present in the aquaculture area in Linggi Estuary. Concentrations of Cu and Zn in the Linggi River water in the estuary are below the standards outlined by the Malaysian Department of Environment, but Cd and Pb concentrations are above the standards. Sediment Cu and Zn concentrations are at safe levels but Cd and Pb concentrations are above threshold levels. Sediment Cu and Zn are due to anthropogenic origin while large percentage of Cd and Pb in the sediment occurs naturally. There is a similar trend of Cu, Zn, Cd and Pb accumulation in three components of the aquaculture area environment, the periphyton, the cage sediment and the river sediment. This reflects close relationship of these components in cycling of the heavy metals. These three components, plus the commercial fish feed contribute heavy metals to the cultured fish. Different metals accumulate in different organs of the cultured fish. Copper is concentrated in the liver, Zn in the bone, Pb in the operculum, Cd in the gills and Hg in the kidney. Copper, Zn, Cd and Pb were also found to accumulate with age of fish. With respect to Cu, Zn and Hg, the fish cultured in Linggi Estuary is safe for consumption but their Cd and Pb levels are above the permissible level set by the Malaysian Government. Elevated levels of these of nonessential elements may pose threats to human health through consumption of the fish. These results indicate that some measures should be taken to prevent the contamination of the estuarine environment for human and animal health.
format	Thesis
qualification_level	Master's degree
author	Yusof, Shahrizad
author_facet	Yusof, Shahrizad
author_sort	Yusof, Shahrizad
title	Distribution And Accumulation Of Heavy Metals In Fish in Cage System in Linggi Estuary, Malaysia
title_short	Distribution And Accumulation Of Heavy Metals In Fish in Cage System in Linggi Estuary, Malaysia
title_full	Distribution And Accumulation Of Heavy Metals In Fish in Cage System in Linggi Estuary, Malaysia
title_fullStr	Distribution And Accumulation Of Heavy Metals In Fish in Cage System in Linggi Estuary, Malaysia
title_full_unstemmed	Distribution And Accumulation Of Heavy Metals In Fish in Cage System in Linggi Estuary, Malaysia
title_sort	distribution and accumulation of heavy metals in fish in cage system in linggi estuary, malaysia
granting_institution	Universiti Putra Malaysia
granting_department	Science
publishDate	2005
url	http://psasir.upm.edu.my/id/eprint/6270/1/FS_2005_41.pdf
_version_	1783725717739012096

Distribution And Accumulation Of Heavy Metals In Fish in Cage System in Linggi Estuary, Malaysia

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