Influence of fish farming in net cages on phytoplankton structure: a case study in a subtropical Brazilian reservoir

Bartozek, Elaine Cristina Rodrigues; Bueno, Norma Catarina; Rodrigues, Liliana

doi:10.1590/1519-6984.21912

Cited by 13 publications

(4 citation statements)

References 33 publications

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“…The mean pH values observed in this study remained within of the ideal range (between 6.5 and 9.0) for fish production (Baldisserotto, 2002). Other authors evaluated the influence of net cages fish farms on water quality and also observed that the pH remained close to neutrality and within the standard limits established by CONAMA 357/05 legislation (Bueno et al, 2008;Américo et al, 2012;Mallasen et al, 2012;Bartozek et al, 2014). The similarity of mean pH values found in this study shows that the fish farming did not affect this variable in Furnas reservoir.…”

Section: Resultssupporting

confidence: 82%

Assessment of the influence of a net cage fish culture on the water quality in Furnas reservoir, Brazil

Barçante

Viana

Sousa

et al. 2022

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Aquaculture is growing rapidly around the world. In Brazil, fish farming in net tanks has high potential due its large number of reservoirs. However, cultivable areas of tanks with a high fish density may be more susceptible to eutrophication compared to other production systems, and may impair the ecosystem where they are installed. Therefore, attention is needed to this type of system to avoid environmental impacts. The objective of this study was to evaluate the influence of a fish farming in net tanks on the water quality of the Furnas reservoir, Brazil. For physical-chemical analysis, water samples were collected monthly during two production cycles. The results were compared to the limits proposed by the environmental legislation for water bodies in Brazil. It was noted that nitrite and phosphate presented mean values higher than those allowed; however, these results were not associated with fish farming, and there is no influence on the water quality of the Furnas reservoir during the study period. Water quality in the reservoir may be influenced by other activities developed in its basin, such as livestock and intensive agriculture that use many fertilizers, released into the reservoir through runoff.

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Section: Resultssupporting

confidence: 82%

Assessment of the influence of a net cage fish culture on the water quality in Furnas reservoir, Brazil

Barçante

Viana

Sousa

et al. 2022

RSD

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“…According to PCA results, the analyzed abiotic variables were influenced by seasonality. Other authors also pointed out seasonality as one of the factors influencing variations in abiotic factors, mainly water transparency, in studies similar to the current one (Alves and Baccarin, 2005;Borges et al, 2010;Kaggwa et al, 2011;Ayroza et al, 2013;Bartozek et al, 2014).…”

Section: Resultssupporting

confidence: 61%

Water quality in Ponte Pensa Aquaculture Park, Solteira Island Reservoir, SP, Brazil, where fish are cultivated under great-volume cage system

et al. 2019

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This study analyzes spatial and temporal variations in physical and chemical water variables due to the influence of fish culture in a cage system (20x20x3 m) in Ponte Pensa Aquaculture Park (Solteira Island Reservoir), before and after cage installation. Water samples were collected on a monthly basis in the subsurface of three sampling sites (August/2011 to July/2013): downstream from the farming site (S1), at the farming site (S2), and upstream from the farming site (S3) (n = 72). Water temperature, pH, dissolved oxygen, transparency, turbidity, electrical conductivity, ammonium ion and total phosphorus were assessed. The principal component analysis (PCA) was applied to joint analysis data. PCA results explained the 61% joint variability in data of the first two components. Fish farming in cages caused significant temporal changes, mainly in January 2013, as well as sudden spatial changes in water physical and chemical variables. Fish culture influenced the quality of the water; such influence was mainly indicated by variations in ammonium ions and in total phosphorus concentrations, which were confirmed through PCA application. PCA results showed two distinct temporal phases: Phase 1 -prior to fish-cage farming, when limnological conditions were characterized by the highest dissolved oxygen concentrations and by high temperatures; Phase 2 -post-production period, when limnological conditions were characterized by the highest total phosphorus and ammonium ion concentrations.Edna Ferreira Rosini et al. Influência da piscicultura em tanques-redes de grande volume na qualidade da água do Parque Aquícola Ponte Pensa, Reservatório IlhaSolteira, SP, Brasil RESUMO O objetivo do presente estudo é analisar a variação espacial e temporal das variáveis físicas e químicas da água na zona de influência da tilapicultura em tanques-redes (20x20x3 m) no parque aquícola Ponte Pensa (Reservatório de Ilha Solteira), abrangendo os períodos pré e pósintrodução da produção. Amostras da água foram obtidas mensalmente (agosto/2011 a julho/2013) na subsuperfície em três estações de amostragem: jusante da área de criação (S1), local de criação (S2) e a montante (S3) (n=72). Foram avaliadas a temperatura da água, pH, oxigênio dissolvido, transparência, turbidez, condutividade elétrica, íon amônio e fósforo total. Utilizou-se a PCA para análise conjunta dos dados. A PCA explicou 61% da variabilidade conjunta dos dados nos dois primeiros componentes. As atividades da piscicultura em tanquesrede provocaram alterações temporais, detectadas especialmente a partir de janeiro de 2013, e sutis alterações espaciais nas variáveis físicas e química da água. O íon amônio e o fósforo total foram as variáveis que mais indicaram a influência desta atividade na qualidade da água, confirmados pela PCA que demostrou duas fases temporais distintas: Fase 1-em que as condições limnológicas antes da produção de peixes em tanques-rede foram caracterizadas pelas maiores concentrações de oxigênio dissolvido e altas temperaturas; e Fase 2período pós-produção, q...

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“…Bueno and Shimizu (2008) performed an extensive revision of the factors responsible for the interspecific variation on the reproductive period of aeglids and suggest that the reproductive period tends to be concentrated in the colder months of the year at lower latitudes, as is the case in the present study. Besides, subtropical regions have seasonal changes in rainfall and induce physical and chemical changes in water (Figueredo and Giani, 2001;Bartozek et al, 2014) that may contribute to this pattern.…”

Section: Discussionmentioning

confidence: 99%

Method of capture and population structure of Aegla georginae Santos and Jara, 2013 (Decapoda: Anomura: Aeglidae) in a tributary of the Ibicuí River in southern Brazil

et al. 2016

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In the current study, we investigated population aspects of Aegla georginae in the Ibicuí River Basin by considering different capture methods and the implication of these data in the analysis of population dynamics. We sampled 1774 individuals: 1259 males (21 and 97 juveniles and 1029 and 113 adults in trap and handnet, respectively), 512 females (05 and 140 juveniles, 184 and 64 adults, and 81 and 38 ovigerous in trap and handnet, respectively) and 03 unsexed individuals (02 and 01 in trap and handnet, respectively). The frequency distribution in size classes shows a bimodal model for both sexes. The carapace length (CL) in males and females varied from 3.11 to 26.00 and 3.73 to 22.36 mm, respectively. Males presented significantly larger sizes than females. The relative abundance between males and females was significantly different from 1:1 with more males than females in most sampling periods (p < 0.05) when considering the grouped data (handnet + trap) and trap captures, but followed the expected ratio in most months when considering individuals sampled only with handnet (p > 0.05). Juveniles were recorded in all seasons, and reproduction occurs throughout the year. The population structure is similar to the model known for aeglids, and the capture methods affected the analysis of A. georginae, where the grouped data and trap captures presented greater abundance of individuals than handnet and males predominate in the larger size classes, and females in the intermediary size classes. Therefore, an integrated view of the capture methods is the best model for studying the population dynamics of aeglids.

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Influence of fish farming in net cages on phytoplankton structure: a case study in a subtropical Brazilian reservoir

Cited by 13 publications

References 33 publications

Assessment of the influence of a net cage fish culture on the water quality in Furnas reservoir, Brazil

Assessment of the influence of a net cage fish culture on the water quality in Furnas reservoir, Brazil

Water quality in Ponte Pensa Aquaculture Park, Solteira Island Reservoir, SP, Brazil, where fish are cultivated under great-volume cage system

Method of capture and population structure of Aegla georginae Santos and Jara, 2013 (Decapoda: Anomura: Aeglidae) in a tributary of the Ibicuí River in southern Brazil

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