Geosmin off-flavour in pond-raised fish in southern Bangladesh and occurrence of potential off-flavour producing organisms

Pangas Pangasianodon hypophthalmus and tilapia Oreochromis niloticus were cultivated for 6 mo in earthen ponds in Bangladesh to examine occurrence of the off-flavour geosmin in water and fish and to test procedures for reduction of off-flavour. In the ponds (~1 m depth and area of 400 m2), the avera...

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Autores principales:	MA Petersen, MA Alam, MM Rahman, ML Ali, S Mahmud, L Schlüter, NOG Jørgensen
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2014
Materias:	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/3af8f9e06e464313a480217645ad0aa0
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spelling	oai:doaj.org-article:3af8f9e06e464313a480217645ad0aa02021-11-17T10:09:54ZGeosmin off-flavour in pond-raised fish in southern Bangladesh and occurrence of potential off-flavour producing organisms1869-215X1869-753410.3354/aei00100https://doaj.org/article/3af8f9e06e464313a480217645ad0aa02014-05-01T00:00:00Zhttps://www.int-res.com/abstracts/aei/v5/n2/p107-116/https://doaj.org/toc/1869-215Xhttps://doaj.org/toc/1869-7534Pangas Pangasianodon hypophthalmus and tilapia Oreochromis niloticus were cultivated for 6 mo in earthen ponds in Bangladesh to examine occurrence of the off-flavour geosmin in water and fish and to test procedures for reduction of off-flavour. In the ponds (~1 m depth and area of 400 m2), the average geosmin concentration was 3.9 ng l-1 (range 0.2 to 20 ng l-1). No effects of season or water treatment (sand filtration or probiotic microbes) were found. The content of geosmin in the fish was 21 ng kg-1 (range: 0.0 to 91 ng kg-1) for pangas and 17 ng kg-1 (range: 0.0 to 68 ng kg-1) for tilapia. Water treatment reduced the geosmin content by 56 to 74% in pangas, but no effect was found in tilapia. Likewise, depuration for ≥12 h in groundwater lowered the geosmin content in pangas (by 65 to 90%) but not in tilapia. Sensory analysis indicated a positive effect of both water treatment and depuration, and the fish were graded ‘no or mild flavour’ after such treatment, compared to ‘strong off-flavour’ in controls. Abundance analyses of known off-flavour producing microorganisms (streptomycete bacteria and cyanobacteria) showed a high density of streptomycetes (0.5 to 13% of the bacterial population), while cyanobacteria made up a maximum of 9.3% of the phytoplankton biomass or were absent. This first study on off-flavours in pangas and tilapia in Bangladeshi ponds indicates that geosmin was not a major off-flavour in the fish, but improvement of sensory quality by water treatment and depuration suggests that other, unidentified off-flavours were present in the fish.MA PetersenMA AlamMM RahmanML AliS MahmudL SchlüterNOG JørgensenInter-ResearcharticleAquaculture. Fisheries. AnglingSH1-691EcologyQH540-549.5ENAquaculture Environment Interactions, Vol 5, Iss 2, Pp 107-116 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
spellingShingle	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 MA Petersen MA Alam MM Rahman ML Ali S Mahmud L Schlüter NOG Jørgensen Geosmin off-flavour in pond-raised fish in southern Bangladesh and occurrence of potential off-flavour producing organisms
description	Pangas Pangasianodon hypophthalmus and tilapia Oreochromis niloticus were cultivated for 6 mo in earthen ponds in Bangladesh to examine occurrence of the off-flavour geosmin in water and fish and to test procedures for reduction of off-flavour. In the ponds (~1 m depth and area of 400 m2), the average geosmin concentration was 3.9 ng l-1 (range 0.2 to 20 ng l-1). No effects of season or water treatment (sand filtration or probiotic microbes) were found. The content of geosmin in the fish was 21 ng kg-1 (range: 0.0 to 91 ng kg-1) for pangas and 17 ng kg-1 (range: 0.0 to 68 ng kg-1) for tilapia. Water treatment reduced the geosmin content by 56 to 74% in pangas, but no effect was found in tilapia. Likewise, depuration for ≥12 h in groundwater lowered the geosmin content in pangas (by 65 to 90%) but not in tilapia. Sensory analysis indicated a positive effect of both water treatment and depuration, and the fish were graded ‘no or mild flavour’ after such treatment, compared to ‘strong off-flavour’ in controls. Abundance analyses of known off-flavour producing microorganisms (streptomycete bacteria and cyanobacteria) showed a high density of streptomycetes (0.5 to 13% of the bacterial population), while cyanobacteria made up a maximum of 9.3% of the phytoplankton biomass or were absent. This first study on off-flavours in pangas and tilapia in Bangladeshi ponds indicates that geosmin was not a major off-flavour in the fish, but improvement of sensory quality by water treatment and depuration suggests that other, unidentified off-flavours were present in the fish.
format	article
author	MA Petersen MA Alam MM Rahman ML Ali S Mahmud L Schlüter NOG Jørgensen
author_facet	MA Petersen MA Alam MM Rahman ML Ali S Mahmud L Schlüter NOG Jørgensen
author_sort	MA Petersen
title	Geosmin off-flavour in pond-raised fish in southern Bangladesh and occurrence of potential off-flavour producing organisms
title_short	Geosmin off-flavour in pond-raised fish in southern Bangladesh and occurrence of potential off-flavour producing organisms
title_full	Geosmin off-flavour in pond-raised fish in southern Bangladesh and occurrence of potential off-flavour producing organisms
title_fullStr	Geosmin off-flavour in pond-raised fish in southern Bangladesh and occurrence of potential off-flavour producing organisms
title_full_unstemmed	Geosmin off-flavour in pond-raised fish in southern Bangladesh and occurrence of potential off-flavour producing organisms
title_sort	geosmin off-flavour in pond-raised fish in southern bangladesh and occurrence of potential off-flavour producing organisms
publisher	Inter-Research
publishDate	2014
url	https://doaj.org/article/3af8f9e06e464313a480217645ad0aa0
work_keys_str_mv	AT mapetersen geosminoffflavourinpondraisedfishinsouthernbangladeshandoccurrenceofpotentialoffflavourproducingorganisms AT maalam geosminoffflavourinpondraisedfishinsouthernbangladeshandoccurrenceofpotentialoffflavourproducingorganisms AT mmrahman geosminoffflavourinpondraisedfishinsouthernbangladeshandoccurrenceofpotentialoffflavourproducingorganisms AT mlali geosminoffflavourinpondraisedfishinsouthernbangladeshandoccurrenceofpotentialoffflavourproducingorganisms AT smahmud geosminoffflavourinpondraisedfishinsouthernbangladeshandoccurrenceofpotentialoffflavourproducingorganisms AT lschluter geosminoffflavourinpondraisedfishinsouthernbangladeshandoccurrenceofpotentialoffflavourproducingorganisms AT nogjørgensen geosminoffflavourinpondraisedfishinsouthernbangladeshandoccurrenceofpotentialoffflavourproducingorganisms
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Geosmin off-flavour in pond-raised fish in southern Bangladesh and occurrence of potential off-flavour producing organisms

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