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Article: Nitrogen budgets for the areolated grouper Epinephelus areolatus cultured under laboratory conditions and in open-sea cages

TitleNitrogen budgets for the areolated grouper Epinephelus areolatus cultured under laboratory conditions and in open-sea cages
Authors
KeywordsAssimilation efficiency
Grouper
Nitrogen budget
Issue Date1999
PublisherInter-Research. The Journal's web site is located at http://www.int-res.com/journals/meps/index.html
Citation
Marine Ecology Progress Series, 1999, v. 186, p. 271-281 How to Cite?
AbstractThe nitrogen budget of grouper Epinephelus areolatus (Forskal) in a culture system can be represented by the mass balance equation: Consumption (C) = feed input (I) - feed wastage (W) = production (P) + mortality (M) + excretion (E) + faecal production (F). A nitrogen budge? was constructed for individual groupers cultured for 1 mo under laboratory condition and an annual nitrogen budget was also constructed for a cohort of E. areolatus cultured in an open-sea-cage farm and fed with trash fish. Consumption was determined independently both by feeding experiments as well as by summation of P, M, E and F, to provide an estimate of the accuracy of the budget equation. In the laboratory budget, 27.5% of N consumed was channelled to growth, while 64.4% was excreted in the form of ammonia and 8.1% lost in faeces. The N-assimilation efficiency was 91.9%. While the net N-retention efficiency was 29.9%. For the annual budget constructed for the open-sea-cage farm, only 8.6% of total N input into the farm was harvested in the form of fish production, while loss to mortality was 3.7%. Ammonia excretion was the most important N loss (46.0%), followed by feed wastage (37.7%) and faecal production (4.0%). 66% of total N input could be accounted for in the laboratory N budget for individual groupers, but only 48% of N input into the culture system could be accounted for in the annual nitrogen budget constructed for open-sea-cage farming. It was estimated that 87.7% of the total N input to the farm was lost to the environment (equivalent to 321 kg N t-1 of fish production). Such a value is almost 3 times as high as N loss from temperate salmonid farms.
Persistent Identifierhttp://hdl.handle.net/10722/92770
ISSN
2015 Impact Factor: 2.361
2015 SCImago Journal Rankings: 1.554
References

 

DC FieldValueLanguage
dc.contributor.authorLeung, KMYen_HK
dc.contributor.authorChu, JCWen_HK
dc.contributor.authorWu, RSSen_HK
dc.date.accessioned2010-09-17T10:56:39Z-
dc.date.available2010-09-17T10:56:39Z-
dc.date.issued1999en_HK
dc.identifier.citationMarine Ecology Progress Series, 1999, v. 186, p. 271-281en_HK
dc.identifier.issn0171-8630en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92770-
dc.description.abstractThe nitrogen budget of grouper Epinephelus areolatus (Forskal) in a culture system can be represented by the mass balance equation: Consumption (C) = feed input (I) - feed wastage (W) = production (P) + mortality (M) + excretion (E) + faecal production (F). A nitrogen budge? was constructed for individual groupers cultured for 1 mo under laboratory condition and an annual nitrogen budget was also constructed for a cohort of E. areolatus cultured in an open-sea-cage farm and fed with trash fish. Consumption was determined independently both by feeding experiments as well as by summation of P, M, E and F, to provide an estimate of the accuracy of the budget equation. In the laboratory budget, 27.5% of N consumed was channelled to growth, while 64.4% was excreted in the form of ammonia and 8.1% lost in faeces. The N-assimilation efficiency was 91.9%. While the net N-retention efficiency was 29.9%. For the annual budget constructed for the open-sea-cage farm, only 8.6% of total N input into the farm was harvested in the form of fish production, while loss to mortality was 3.7%. Ammonia excretion was the most important N loss (46.0%), followed by feed wastage (37.7%) and faecal production (4.0%). 66% of total N input could be accounted for in the laboratory N budget for individual groupers, but only 48% of N input into the culture system could be accounted for in the annual nitrogen budget constructed for open-sea-cage farming. It was estimated that 87.7% of the total N input to the farm was lost to the environment (equivalent to 321 kg N t-1 of fish production). Such a value is almost 3 times as high as N loss from temperate salmonid farms.en_HK
dc.languageengen_HK
dc.publisherInter-Research. The Journal's web site is located at http://www.int-res.com/journals/meps/index.htmlen_HK
dc.relation.ispartofMarine Ecology Progress Seriesen_HK
dc.subjectAssimilation efficiencyen_HK
dc.subjectGrouperen_HK
dc.subjectNitrogen budgeten_HK
dc.titleNitrogen budgets for the areolated grouper Epinephelus areolatus cultured under laboratory conditions and in open-sea cagesen_HK
dc.typeArticleen_HK
dc.identifier.emailLeung, KMY: kmyleung@hku.hken_HK
dc.identifier.emailWu, RSS: rudolfwu@hku.hken_HK
dc.identifier.authorityLeung, KMY=rp00733en_HK
dc.identifier.authorityWu, RSS=rp01398en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0033578583en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033578583&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume186en_HK
dc.identifier.spage271en_HK
dc.identifier.epage281en_HK
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridLeung, KMY=7401860738en_HK
dc.identifier.scopusauthoridChu, JCW=7402881225en_HK
dc.identifier.scopusauthoridWu, RSS=7402945079en_HK

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