Daercy Maria Monteiro de Rezende Ayroza
@sp.gov.br
Instituto Pesca
Possui graduação em Agronomia pela Universidade Federal de Lavras (1982), mestrado em Geografia pela Universidade Estadual de Maringá (2001) e doutorado pela UNESP, no Programa de Pós-Graduação em Aqüicultura no CAUNESP, Jaboticabal (2012). Atualmente é tesoureira do Capítulo Latinoamericano e Caribenho (LACC), da World Aquaculture Society (WAS), consultora da Fundação de Desenvolvimento da Pesquisa do Agronegócio (FUNDEPAG) e pesquisadora científica do Instituto de Pesca, da Agência Paulista de Tecnologia dos Agronegócios, SAA-SP. Tem experiência na área de Ecologia, com ênfase em Limnologia, atuando principalmente nos seguintes temas: monitoramento ambiental em áreas com tanques-rede; regularização e licenciamento de aquicultura; e estudos e monitoramento de Limnoperna fortunei.
EDUCATION
Graduação em Agronomia pela Universidade Federal de Lavras (1982), mestrado em Geografia pela Universidade Estadual de Maringá (2001) e doutorado pela UNESP, no Programa de Pós-Graduação em Aqüicultura no CAUNESP, Jaboticabal (2012).
Scopus Publications
Scopus Publications
Esther Faria Braga, Daercy Maria Monteiro de Rezende Ayroza, Maria Clara de Macedo Silva, Thiana Santiago Nascimento, Eduardo Gomes Sanches, Clovis Ferreira do Carmo, Lilian Paula Faria Pereira, André Luís Mazzei Albert, William Romão Batista, Rosangela Sabbatini Capella Lopes,et al.
American Chemical Society (ACS)
Daercy Maria Monteiro de Rezende Ayroza, Taissa Juliana Melo, Lilian Paula Faria‐Pereira, Maria Letizia Petesse, Mauro de Freitas Rebelo, Clóvis Ferreira Carmo, and Daniel Hugo Cataldo
Wiley
Daercy Maria Monteiro de Rezende Ayroza, Clovis Ferreira do Carmo, Antonio Fernando Monteiro Camargo, Márcia Divina Oliveira, and Maria Letizia Petesse
Wiley
Cage fish farming is an important economic activity in Brazil where tilapia (Oreochromis niloticus) is the main cultivated species. To investigate the cage fish farm as a vector for golden mussel invasion, we hypothesised that: (1) Limnoperna fortunei, a freshwater bivalve mollusc, finds greater food availability in the cage fish farm; (2) the cage fish farm favours mollusc colonisation and its nutritional status; and (3) its performance in the reservoir would vary over the year. We obtained data from limnological variables as well as the number of larvae and adult individuals, to evaluate condition index (CI) monthly from February 2015 to January of 2016. We established sampling stations at three points with fish farming and three points without fish farming (controls) in the Canoas II Reservoir, Paranapanema River, Brazil. We used principal component analysis (PCA) to identify spatial and temporal distribution of samples according to limnological variables. We performed a linear mixed model analysis to test the hypothesis of no difference between areas (fish farm and control) and time (months) for larval density and CI of L. fortunei. The first PCA axis (28.48% of variance) revealed a temporal gradient, showing the separation between cold and hot months. The second PCA axis (19.61% of variance) separated the samples of control and fish farms; fish farms displayed higher concentrations of total phosphorus, nitrite, and chlorophyll a. Larval densities of L. fortunei were higher in fish cage areas with time being responsible for 35% of this variation. Mussel CI was also higher in fish farms and time was responsible for 36% of the variation. We conclude that fish production in cages contributes to the establishment of golden mussels in the reservoir. Our results serve as a warning that other molluscs or invasive species may be favoured by aquaculture activities in aquatic environments. The colonisation of the mussel in the reservoir varies during the year in response to seasonality.
Jesaías Ismael COSTA, Maria Inez Espagnoli MARTINS, and Daercy Maria Monteiro de Rezende AYROZA
Boletim do Instituto de Pesca
The economic impact of the control of the golden mussel on tilapia bred in net cages, with different volumes and production scales, is evaluated. Twelve fish farms were selected in Ilha Solteira Reservoir, on the Parana River (between the states of Sao Paulo and Mato Grosso do Sul), and in the Canoas II and Chavantes Reservoirs on the Paranapanema River (between the states of Sao Paulo and Parana), Brazil. A semi-structured questionnaire provided data on expenditure and capital required for calculating control costs. Expenses on labor, maintenance and depreciation of infrastructure and equipments, cage maintenance, additional depreciation and costs with electricity or fuel for cleaning were accounted. Large-size enterprises had the lowest costs, regardless of net cage volume. Cage depreciation and maintenance greatly influenced costs for mussel control, reaching an average rate of 69.89%. Lowest added costs were reported in large-size fish farms (R$ 0.45 kg fish-1), followed by medium- and small-size ones (R$ 1.00 kg fish-1). Mean economic impact reached 11.48% (large-size), 27.25% (medium-size) and 25.81% (small-size). Impact varied between 7.83% and 19.22%, respectively, in 108m3 and 6m3 net cages.
Daercy Maria Monteiro Rezende Ayroza, Marcos Gomes Nogueira, Luiz Marques da Silva Ayroza, Edmir Daniel Carvalho, Antonio Sergio Ferraudo, and Antonio Fernando Monteiro Camargo
Wiley
The influence of tilapia cages on limnological characteristics of the Chavantes Reservoir, Paranapanema River, Brazil, was investigated in March and June 2007. Principal components analysis was used to compare the transparency; dissolved oxygen; temperature; total organic nitrogen, phosphorus, and dissolved solids; chlorophyll a and electrical conductivity of fish farm 1 (239.3 m.t.), 2 (461.5 m.t.) and areas without cages, in the lacustrine and river-reservoir transition regions. The variables differentiated the regions and areas with and without cages. In March, in the lacustrine region, there was a thermal and chemical stratification, and in the transition region, there was a temperature and oxygen reduction gradient between the surface and bottom that was also observed in June in fish farm 1. The higher transparency confirmed the increased light penetration in the lacustrine region. In the transition region, there were higher turbidity, total dissolved solid, and conductivity values that are likely related to allochthonous material flow and transport. In fish farms, lower oxygen and pH values indicate intense decomposition and respiration. The generally higher total dissolved solid and nutrient values, turbidity, and conductivity and the lower transparency in one or both fish farms indicate their contribution to eutrophication, demonstrating the need for careful monitoring.
Igor P. Ramos, Heleno Brandão, Augusto S. Zanatta, Érica de O.P. Zica, Reinaldo J. da Silva, Daercy M.M. de Rezende-Ayroza, and Edmir D. Carvalho
Elsevier BV
Abstract Historically, the ichthyofauna of large Brazilian rivers has been subject to anthropogenic interference, such as impoundments. Currently, cage fish farming systems are a new source of impact on aquatic ecosystems. The objective of this study was to characterise the impact of freshwater fish farms on the feeding of five species of Neotropical freshwater fish. Specimens of Astyanax altiparanae, Galeocharax knerii, Iheringicthys labrosus, Pimelodus maculatus and Plagioscion squamosissimus were sampled in areas around two systems of cage fish farming (CF), and two control areas (CT) that were not influenced by this activity. Results show that there were significant changes in the diet of trophic generalist species (A. altiparanae, P. maculatus and I. labrosus) accompanied by a related increase in the condition factor values of these species in cage areas. Trophic specialist species, such as the carnivorous fish species G. knerii and P. squamosissimus, presented small differences between the CF and CT areas with regard to diet and showed no differences in other analyses performed. In conclusion, cage fish farms can affect the natural diet of trophic generalist fish species, directly affecting the nutritional status (condition factor), where food wastes was found to be one of the principal items consumed by this trophic guild. Results indicate that these species are responsible for recycling a great quantity of organic matter transferred by this type of activity, which, along with local fishery activities, contribute to mitigation of associated processes of eutrophication.
Luiz Marques da Silva Ayroza, Elizabeth Romagosa, Daercy Maria Monteiro de Rezende Ayroza, João Donato Scorvo Filho, and Fernando André Salles
FapUNIFESP (SciELO)
Neste trabalho foi realizada a análise econômica da produção de juvenis de tilápia-do-nilo em tanques-rede utilizando-se diferentes densidades de estocagem. O experimento foi desenvolvido em área aquícola, em delineamento de blocos casualizados, com quatro densidades de estocagem (100, 200, 300 e 400 peixes m-3), avaliadas com seis repetições, em dois períodos de criação: de março a abril de 2005 (52 dias - peso inicial de 43,08 ± 2,98 g e peso final de 262,14 ± 47,86 g) e de março a abril de 2006 (58 dias - peso inicial de 43,16 ± 5,34 g e peso final 314,24 ± 73,30 g). Foram avaliadas as seguintes variáveis econômicas: custo da ração mais custo do juvenil dividido pela biomassa, em R$ kg-1; porcentagem do custo da ração por quilo de peixe produzido sobre o preço de venda; porcentagem do custo do juvenil por quilo de peixe produzido sobre o preço de venda e; porcentagem dos custos da ração mais do juvenil por quilo de peixe produzido sobre o preço de venda. Da menor densidade de estocagem (100) para a maior (400), ocorreu diminuição no ganho de peso diário e elevação do índice de conversão alimentar aparente, mas essa redução não comprometeu a taxa de sobrevivência. Entretanto, o ganho de biomassa aumentou com o adensamento de peixes. As maiores receitas líquidas foram obtidas nas densidades de estocagem de 100 e 200 peixes m-3. Os preços não remuneraram os custos operacionais (efetivo e total) em maiores densidades (300 e 400 peixes m-3). Os melhores resultados para a produção de juvenis de tilápia-do-nilo foram obtidos com densidades de até 200 peixes m-3.