Carbon, nitrogen and phosphorus loadings from tilapia fish cages in Lake Malawi and factors influencing their magnitude

Gondwe, Mangaliso J.; Guildford, Stephanie J.; Hecky, Robert E.

doi:10.1016/j.jglr.2010.11.014

Cited by 44 publications

(34 citation statements)

References 52 publications

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“…Estimates from aquaculture production records indicate that 71% to 88% of nutrients added through feed to fish cages in Lake Malawi are lost into the surrounding environment from fish cages. The amount of nutrients discharged from the fish cages are directly proportional to the amount of feed used so that as the fish farming expands, the levels of nutrients discharged may exceed levels observed in major rivers draining into the lake (Gondwe et al, 2011). Similar losses of between 70% and 80% C, N and P have been reported from temperate cages by Gowen and Bradbury (1987), Holby and Hall (1991), Hall et al (1990Hall et al ( , 1992 and Kaushik (1998).…”

Section: Introductionmentioning

confidence: 53%

“…The recent development of intensive cage aquaculture in the shallow southeast arm represents a new source of nutrients to Lake Malawi which may also accelerate eutrophication. Gondwe et al (2011) demonstrate that the establishment of cage culture in the lake can be a significant source of C, N and P nutrients into the lake's epilimnion. Estimates from aquaculture production records indicate that 71% to 88% of nutrients added through feed to fish cages in Lake Malawi are lost into the surrounding environment from fish cages.…”

Section: Introductionmentioning

confidence: 91%

See 1 more Smart Citation

Physical–chemical measurements in the water column along a transect through a tilapia cage fish farm in Lake Malawi, Africa

Gondwe

Guildford

Hecky

2011

Journal of Great Lakes Research

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Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 91%

Physical–chemical measurements in the water column along a transect through a tilapia cage fish farm in Lake Malawi, Africa

Gondwe

Guildford

Hecky

2011

Journal of Great Lakes Research

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“…Gondwe et al (2011) observed that nutrient losses from cages to the surrounding environment in the order of 81-91% for C, 59-80% for N and 85-92% for p, indicating the importance of cage aquaculture as a new source of nutrients, not only locally, but on a lake-wide basis, may stimulate microbial populations. As a consequence, the quality of commercialised fish can be committed due to the high contamination of pathogenic bacteria or saprophytic bacteria that accelerates the deterioration process of the fish.…”

Section: Discussionmentioning

confidence: 99%

The influence of fish culture in floating net cages on microbial indicators of water quality

et al. 2013

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This work was carried out to analyse the microbiological parameters of the water quality of a reservoir used for the irrigation and culture of tilapia (Oreochromis niloticus) in floating net cages. The physico-chemical parameters, counts of mesophilic total aerobic bacteria, total and thermotolerant coliforms and fecal streptococci, and the presence of Escherichia coli in samples of water collected in three sites of the reservoir (pre-culture site, culture site, post-culture site) were analysed. The levels of ammonia (0.047-0.059 mg/L), nitrite (0.001-0.021 mg/L) and total phosphorus (0.050-0.355 mg/L) in the water did not show significant differences (p > 0.05) between sampling sites. The levels of total bacteria in the water varied between 1.3 x 10 4 and 67.3 x 10 4 CFU/100 mL. The MPN values of thermotolerant coliforms (< 930 MPN/100 mL) were within values recommended for water used for fish culture and/or irrigation. The presence of E. coli and fecal streptococci were verified in 48% and 56% of analysed samples, respectively. The site with floating net cages showed more samples contaminated with E. coli and fecal streptococci than other sampling points.Keywords: fish culture, tilapia, cage, coliforms, faecal streptococci. Influência da piscicultura em tanques-rede sobre os microrganismos indicadores da qualidade de água ResumoEste trabalho foi realizado para analisar os parâmetros microbiológicos da qualidade da água de um reservatório destinado a irrigação e à cultivo de tilapia do Nilo (Oreochromis niloticus) em tanques redes. Foi realizada análise de parâmetros físico-químicos, quantificação de bactérias totais aeróbias mesófilas, coliformes totais e termotolerantes, estreptococos fecais e a detecção de E. coli em amostras de água coletada em três pontos distintos do açude (pré-cultivo, cultivo, pós-cultivo). Os níveis de amônia (0,047-0,059 mg/L), nitrito (0,001-0,021 mg/L) e fósforo total (0,050-0,355 mg/L) na água não apresentaram diferenças significativas (p > 0.05) entre os pontos de coleta. As contagens de bactérias aeróbias mesófilas variaram entre 1,3 x 10 4 e 67,3 x 10 4 UFC/100 mL nas amostras de água. O NMP de coliformes termotolerantes (< 930 NMP/100 mL) se apresentou dentro do limite permitido para águas doces destinadas a piscicultura e/ou irrigação. A presença de E. coli foi constatada em 48% e de estreptococos fecais em 56% das amostras de água analisadas. O local de cultivo de tilápia em tanques-rede apresentou maior número de amostras contaminadas com E. coli e estreptococos fecais que outros pontos de amostragem.

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“…The main impacts related to aquaculture in rivers, lakes, and reservoirs are associated to the increased flow of particles and dissolved nutrients in the environment (Sugiura et al, 2006;Azevedo et al, 2011;Gondwe et al, 2011;Canale et al, 2016); the mortality and loss of biodiversity of fishes (Sang, 2006); the contamination by chemical compounds (through the use of antibiotics, antiparasitics, anesthetics, and disinfectants) (Burridge et al, 2010); the lower dissolved oxygen concentrations (Hamblin & Gale, 2002); the occurrence of harmful algal blooms (Sowles, 2009); and the increase in the contents of organic matter and metals in the sediment (Xia et al, 2016). In addition to these factors, the following were observed: changes in the biodiversity of the microflora and benthic sediments (Buschmann et al, 2009); changes in the trophic structure and biological attributes of the diet of wild fishes due to the introduction of exotic species from aquaculture (Arthur et al, 2010;Carvalho et al, 2012;Ramos et al, 2014); dissemination of diseases that may affect wild populations of aquatic organisms (Israel, 2007); and, in some cases, direct conflicts with other users of water resources, which can cause adverse social effects (Béné & Obirih-Opareh, 2009).…”

Section: Environmental Impact Of Aquaculture In Lakes and Reservoirsmentioning

confidence: 99%

Mathematical modeling for the management of the carrying capacity of aquaculture enterprises in lakes and reservoirs

Bueno

Bureau

Skipper-Horton

et al. 2017

Pesq. agropec. bras.

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-Flooded areas of reservoirs and artificial lakes have been increasingly used for fish production; however, the waste generated by aquaculture has become a concern for the sustainable development of this activity. One of the main strategies adopted by management and regulatory agencies is the use of hydrodynamic models that calculate the carrying or nutrient load capacity of a particular water body and the effect of fish farming. These models are precise in the development of optimal strategies for feeding and waste calculation. This review paper addresses this topic and describes the methodology developed for the analysis and simulation of the carrying capacity for fish production, based on the integration of the Fish-PrFEQ nutritional bioenergetic model and the hydrodynamic model of Dillon & Rigler. This methodology allows evaluating the real contribution of aquaculture waste and assists in the planning and management of aquaculture in these aquatic environments, besides enabling and encouraging producers and the aquaculture industry to use fish food with better nutritional quality and lower environmental impact.Index terms: hydrodynamic modeling, mass balance, nutritional bioenergetics, solid waste, sustainable aquaculture. Modelagem matemática para gestão da capacidade de suporte de empreendimentos aquícolas em lagos e reservatóriosResumo -Áreas inundadas de reservatórios e lagos artificiais estão sendo cada vez mais utilizadas para a produção de peixes; contudo, os resíduos lançados pela aquicultura tornaram-se uma preocupação para o desenvolvimento sustentável desta atividade. Uma das principais estratégias adotadas pelos órgãos gestores e fiscalizadores consiste no uso de modelos hidrodinâmicos que calculam a capacidade de suporte ou de carga de nutrientes de um determinado corpo hídrico e a influência dos cultivos de peixes. Esses modelos são precisos no desenvolvimento de estratégias ideais de alimentação e cálculo de resíduos. Este trabalho de revisão aborda esta temática e traz uma descrição da metodologia desenvolvida para análise e simulação da capacidade de suporte para produção de pescados, baseada na integração do modelo bioenergético nutricional "Fish-PrFEQ" com o modelo hidrodinâmico de Dillon & Rigler. Esta metodologia permite avaliar a real contribuição de resíduos aquícolas e auxilia no planejamento e na gestão da aquicultura nestes ambientes aquáticos, além de possibilitar e incentivar que os produtores e a indústria aquícola utilizem rações de melhor qualidade nutricional e menor impacto ambiental.Termos para indexação: modelagem hidrodinâmica, balanço de massa, bioenergética nutricional, resíduos sólidos, aquicultura sustentável.

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Carbon, nitrogen and phosphorus loadings from tilapia fish cages in Lake Malawi and factors influencing their magnitude

Cited by 44 publications

References 52 publications

Physical–chemical measurements in the water column along a transect through a tilapia cage fish farm in Lake Malawi, Africa

Physical–chemical measurements in the water column along a transect through a tilapia cage fish farm in Lake Malawi, Africa

The influence of fish culture in floating net cages on microbial indicators of water quality

Mathematical modeling for the management of the carrying capacity of aquaculture enterprises in lakes and reservoirs

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