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This study reports the presence of high parasitic load by Myzobdella lugubris Leidy, 1851 in the swimming crab Callinectes bocourti A. Milne-Edwards, 1879 from Amazon mangrove. We sampled the swimming crabs using a baited trap, between January and June 2023, in Santa Maria River, located in the municipality of Curuçá, state of Pará, Brazil (geographical coordinates 0°40'3.705"S, 047°54'43.405"W). After sampling, each swimming crab was individually placed in plastic containers for the count of leeches per individual. In the laboratory, the specimens were sexed, measured (parasite and host) and fixed in 70% alcohol. For the leech species identification, macroscopic techniques were combined with light microscopy (LM) and scanning electron microscopy (SEM). We examined 86 specimens of C. bocourti (75 males and 11 females) in a ratio of 1 M:0.14 F, all infested with leeches. In total, 186 leech specimens were collected, ranging from 1 to 21 leeches per host. Leeches oviposited the cocoons in greater quantities in ventral area of swimming crab carapace (32%), followed by dorsal area of carapace (29.09%), chelipeds (24.34%) and ambulatory legs (14.57%). The presence of M. lugubris is a risk to the health of the host, once it may transmit a range of diseases to aquatic organisms, and subsequently risk to human health.

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Glyphosate is a broad-spectrum, non-selective herbicide used to control weeds and protect agricultural crops, and it is classified as potentially carcinogenic by the International Agency for Research on Cancer. In Mexico, the use of pesticides is a common practice, including glyphosate. However, on December 31st, 2020, the Mexican government decreed the prohibition of this herbicide as of January 2024. In this review, we investigate the association between glyphosate and cancer risk and found that most of the studies focused using animals showing negative effects such as genotoxicity, cytotoxicity and neurotoxicity, some studies used cancer cell lines showing proliferative effects due to glyphosate exposure. To our knowledge, in Mexico, there are no scientific reports on the association of glyphosate with any type of cancer. In addition, we reviewed the toxicological effects of the herbicide glyphosate, and the specific case of the current situation of the use and environmental damage of this herbicide in Mexico. We found that few studies have been published on glyphosate, and that the largest number of publications are from the International Agency for Research on Cancer classification to date. Additionally, we provide data on glyphosate stimulation at low doses as a biostimulant in crops and analytical monitoring techniques for the detection of glyphosates in different matrices. Finally, we have tried to summarize the actions of the Mexican government to seek sustainable alternatives and replace the use of glyphosate, to obtain food free of this herbicide and take care of the health of the population and the environment.

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Introducción: La ley Orgánica del Ambiente 7554, señala a la Secretaría Técnica Nacional Ambiental (SETENA) como la institución encargada de evaluar y dar seguimiento a las medidas de compensación ambiental en Costa Rica. Objetivo: Exponer el marco jurídico y legislación que rige y aplica la SETENA en el tema de compensación ambiental. Métodos: Se describe brevemente un caso de estudio sobre como la compensación ha sido implementada en el país. Resultados: SETENA interpreta la compensación ambiental como un conjunto de medidas y acciones generadoras de beneficios ambientales que: 1) son proporcionales a impactos o perjuicios ambientales causados por el desarrollo de los proyectos siempre que no se puedan adoptar medidas de prevención, corrección o mitigación; y 2) constituyen una herramienta a utilizar durante la etapa de gestión ambiental, en la fase constructiva u operativa, cuando se evidencien incumplimientos a los compromisos ambientales adquiridos, faltas a la normativa ambiental, o daños ambientales identificados después de obtener la licencia ambiental para el proyecto. Conclusión: SETENA define los Planes de Compensación Ambiental como un procedimiento que sirve de guía para establecer la toma de acciones. Las medidas de compensación se establecen de acuerdo con el tipo de proyecto y hallazgos encontrados durante el monitoreo, por lo que no hay una estandarización para estos planes de compensación.

Introduction: The Organic Law of the Environment No. 7554 designates the National Environmental Technical Secretary (Spanish Acronym - SETENA) as the institution in charge of evaluating and following up on environmental compensation measures in Costa Rica. Objective: To expose the legal framework and legislation that governs and applies SETENA about environmental compensation in this country. Methods: A case study on how compensation has been implemented in the country is briefly described. Results: SETENA interprets environmental compensation as a set of measures and actions that generate environmental benefits that: 1) are proportional to the environmental impacts or damages caused by the development projects, provided that prevention, correction, or mitigation measures cannot be adopted; and 2) is a tool to be used during the environmental management stage, in the construction or operational phase, when there is evidence of non-compliance with the acquired environmental commitments, lack of environmental regulations, or environmental damage identified after reaching environmental approval for the project. Conclusion: SETENA defines the Environmental Compensation Plan as a procedure that serves as a guide to establish the actions to take. The compensation measures are dictated concerning the type of project and the findings encountered during its monitoring, which is why there is no standardization of these compensation plans.

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Pollution incidents cause transient water quality alterations during the passage of contaminants' plume along watercourses, with plume passage period and contaminants' concentrations modelled by advection-dispersion equations. Despite being transient, water quality alterations can impose many impacts on the streamwater ecosystem services. This study proposes two frameworks based on Habitat Equivalency Analysis to be applied during assessments of streamwaters' pollution incidents and respective compensation panoramas: (1) Streamwater interim loss framework, to calculate interim loss debits caused by transient alterations in the streamwater quality; (2) Total credit framework, to calculate streamwater credits generated by improvements in selected watercourse's streamwater quality, produced by wastewater treatment plants in this study. The amount of credits calculated in the selected watercourses assists in the proposal of suitable compensatory remediation projects to offset interim losses. Frameworks' calculations are founded on IVA, a water quality index for protection of aquatic life and aquatic communities. Frameworks' calculations depend on three parameters: IVA, watercourses fluxes and the present value multiplier. The frameworks were calculated in ΔIVAxL, unit defined by multiplying sensed alterations in streamwater quality (as ΔIVA) and streamwater flux, in liters (L). The frameworks were applied to two major streamwater pollution incidents in Brazil, caused by the dam collapses of Mariana and Brumadinho, suggesting suitable compensatory remediations' projects for the respective streamwater interim losses. Depending on the selected project, Brumadinho compensation period varied from 2 to 5 years, with estimated costs in the 2020 Int.$ 5.7-18.7M range; Mariana compensation period varied from 8 to 20 years, with estimated costs in the 2020 Int.$ 16.7-58.1M range. Based on Brumadinho compensatory remediation projects, an average water pollution environmental damage value per interim loss was calculated, 1.17E-4 2020 Int.$/ΔIVAxL, which might be useful in comparing streamwater pollution evaluations around the world.

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This study aimed to investigate the phytoremediation potential promoted by Baccharis dracunculifolia DC. and Baccharis trimera (Less.) DC. in copper mining tailing area, in the Southern part of Brazil. The plants were selected considering their spontaneous growth in tailing area. The phytoremediation indexes including translocation factor (TF), bioconcentration factor (BCF), metal extraction ratio (MER), and plant effective number (PEN) were assessed. Both species showed higher concentrations of heavy metals in the roots than to the shoots. B. trimera has potential for phytoextraction of Zn, Cd, Cr, and Pb and phytostabilization of Ba and Ni, whereas B. dracunculifolia demonstrated potential for phytoextraction of Pb and phytostabilization of Cu, Zn, and Ba. B. trimera showed higher potential in phytoremediation of the metals such as Cu > Zn > Cr > Ni and Cd than the B. dracunculifolia plants. A smaller number B. trimera plants was required to remove 1 g of Cu, Zn, Cr, Pb, Ni, and Cd than B. dracunculifolia plants, and implies that B. trimera is more efficient for decontamination of the metals. Both species showed potential for phytoremediation of metals in the mining tailing area under study.

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Tobacco is the most widespread non-food crop in the world. In Brazil, tobacco cultivation is one of the main commodities of the southern region. However, its production is associated with environmental impacts and risks to human health, which have yet to be quantified. This paper uses midpoint and endpoint life cycle assessment (LCA) to analyze the potential environmental damage and human health risk associated with agricultural production of conventional Virginia (CV), organic Virginia (OV), and Burley (BU) tobacco varieties. Organic tobacco production substitutes synthetic fertilizers and pesticides with organic compounds in the cropping stage. The results show that for one ton of dried tobacco, BU, CV, and OV emit 1,610, 1,426, and 1,091 kg CO2 eq, respectively. For organic production, greater impacts are linked to the land use (LU) impact category. The endpoint results showed that OV production resulted in a higher potential for human and environmental damage than BU and CV. The drying of green OV and CV tobacco requires the burning of firewood, which emits high levels of particulate matter and is associated with human health (HH) damage. Overall, the HH damage category accounts for 68%, 82%, and 78% of the total score points associated with the production of BU, CV, and OV.

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O objetivo desse estudo foi analisar a percepção clínica, ética e legal de acadêmicos do curso de Odontologia sobre o gerenciamento de Resíduos em Serviços de Saúde (RSS). O estudo foi do tipo observacional transversal, com amostragem censitária de acadêmicos do 8º(n=23) e 9º(n=18) períodos. No questionário aplicado abordou-se o processo de produção, manuseio e descarte dos RSS, no que concerne ao gerenciamento, legislação e questões éticas. Os dados foram organizados em planilhas e interpretados por meio de análise descritiva. Sobre as normas vigentes para o gerenciamento de RSS, 82,9% e 95,1% dos estudantes afirmaram desconhecer o tratamento/disposição final e regulamento técnico para o gerenciamento de RSS, respectivamente. Em relação ao Plano de Gerenciamento de Resíduos de Serviços de Saúde (PGRSS), 85,4% não conhecem o Código Penal e 87,8% não estão familiarizados com o Código Civil. Além de disso, a maioria dos entrevistados desconhecem as Normas da Associação Brasileira de Normas Técnicas (75,6%) e as Resoluções do Conselho Nacional do Meio Ambiente (82,9%) e da Agência Nacional de Vigilância Sanitária (95,1%). Por outro lado, 73,2% afirmam conhecer os direitos e deveres do cirurgião-dentista, presentes no Código de Ética Odontológica. Quanto à classificação dos resíduos produzidos em ambiente odontológico, 95,1% responderam corretamente sobre o hipoclorito de sódio e 97,6% sobre os roletes de algodão e gaze com sangue. Portanto, foi possível concluir que existe conhecimento satisfatório sobre os aspectos clínicos e éticos, entretanto insuficiente quanto às legislações vigentes no Brasil (AU).

The aim of this study was to analyze the dental students' clinical, ethical and legal perception on the management of health services waste (HSW). This was a cross-sectional observational study, with census sampling of students from the 8th (n=23) and 9th (n=18) terms. The applied questionnaire addressed the process of production, handling and disposal of HSW, regarding management, legislation and ethical issues. Data were organized in spreadsheets and interpreted by descriptive analysis. Regarding the current rules for the management of WHS, 82.9% and 95.1% of the students stated that they did not know the final treatment/disposition and technical regulation for HSW management, respectively. Regarding the Health Services Waste Management Plan (HSWMP), 85.4% did not know the Criminal Code and 87.8% were not familiar with the Civil Code. In addition, most respondents were unaware of the principles of the Brazilian Association of Technical Standards (75.6%) and the Resolutions of the National Environmental Council (82.9%) and the National Health Surveillance Agency (95.1%). On the other hand, 73.2% claimed to know the rights and duties of the dental surgeon, present in the Code of Dental Ethics. Regarding the classification of residues produced in a dental environment, 95.1% answered correctly about sodium hypochlorite and 97.6% about cotton and blood gauze rollers. Therefore, it was possible to conclude that there is satisfactory knowledge about the clinical and ethical aspects, however insufficient regarding the current legislation in Brazil (AU).

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O presente trabalho analisa a proteção ao meio ambiente pelo ordenamento jurídico brasileiro. Identifica, desde a Constituição Federal, até a legislação infraconstitucional, dispositivos que tratam da proteção ao meio ambiente e da responsabilidade daqueles que causarem dano ambiental em indenizar e reparar os prejuízos. Ao final, relaciona a responsabilidade jurídica prevista pela legislação ao caso específico do acidente ambiental ocorrido em Mariana, Minas Gerais, no ano de 2015.

This paper analyzes the protection of the environment by the Brazilian legal system. It identifies, from the Federal Constitution, to the infraconstitutional legislation, devices that deal with the protection of the environment and the responsibility of those who cause environmental damages in indemnifying and repairing the damages. In the end, it relates the legal responsibility provided by the legislation to the specific case of the environmental accident occurred in Mariana, Minas Gerais, in the year 2015.

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O presente trabalho analisa a proteção ao meio ambiente pelo ordenamento jurídico brasileiro. Identifica, desde a Constituição Federal, até a legislação infraconstitucional, dispositivos que tratam da proteção ao meio ambiente e da responsabilidade daqueles que causarem dano ambiental em indenizar e reparar os prejuízos. Ao final, relaciona a responsabilidade jurídica prevista pela legislação ao caso específico do acidente ambiental ocorrido em Mariana, Minas Gerais, no ano de 2015.(AU)

This paper analyzes the protection of the environment by the Brazilian legal system. It identifies, from the Federal Constitution, to the infraconstitutional legislation, devices that deal with the protection of the environment and the responsibility of those who cause environmental damages in indemnifying and repairing the damages. In the end, it relates the legal responsibility provided by the legislation to the specific case of the environmental accident occurred in Mariana, Minas Gerais, in the year 2015.(AU)

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Los alcances acumulativos de la acción humana, aunados al poderío tecno-científico, llevan hoy a que nuestra especie no solo se cuestione los límites de la capacidad que tiene la Tierra para asimilar y reciclar luego los desechos de la actividad humana, sino también los límites de nuestro especieísmo en la trama de la existencia. No ha sido la excepción, sino más bien la regla, que en una constante nuestra especie haya aumentado en población, sobreutilizando el entorno y malogrando un desarrollo que deteriora el medio ambiente cada vez más. El ser humano ha escrito la historia de la humanidad de forma especieísta, ensalzando su rol histórico que ha hecho obra contra el ser ecológico. Sin embargo, aisladas y frágiles treguas entre animales humanos y no humanos posibilitan cuestionarnos el sentido y significado filosófico del conservacionismo en eras del más crudo especieísmo.

The cumulative scope of human action, combined with the techno-scientific power nowadays take our species not only to question the limits of the Earth capacity to assimilate and recycle the waste products of human activities, but also the limits of speciesism within the weave of existence. It has not been the exception but rather the rule, that our species has constantly increased its population, overusing the environment and ruining a development that deteriorates the environment increasingly. Human beings have written the history of humanity in a speciesist form, extolling their historic role which has made work against the ecological being. However, isolated and fragile truces between human and nonhuman animals allow questioning the meaning and philosophical significance of conservationism in an age of the crudest speciesism.

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O soro do leite é um subproduto de relevância da indústria de queijos por ser produzido em grande volume e conter aproximadamente 55% dos nutrientes do leite. O seu aproveitamento industrial em produtos da alimentação humana ainda é considerado baixo, visto que a alta concentração de minerais proporciona uma baixa aceitação sensorial dos alimentos que o contém. Dessa forma, têm-se desenvolvido bebidas, principalmente as fermentadas, que apresentam novos sabores e aromas, com o objetivo de recuperar essa importante fonte de nutrientes para a cadeia alimentar humana. Observa-se, portanto, que a utilização do soro de queijo enriquece os produtos que os contém e evita o descarte diretamente no solo, na rede pública de esgoto, rios e lagos, minimizando o impacto negativo, conforme abordado nesta revisão.

The whey is a relevant by-product in the cheese industry for being produced in large volume and for containing approximately 55% of its nutrients from milk. Its industry performance upon human nutrition products is still considered low, because the high concentration of minerals provides a low sensorial acceptation of food. Thus, beverages have been developed, mainly the fermented ones that display new flavors and aromas, aiming at recovering such important source of nutrients for the human food chain. It is observed, therefore, that the use of cheese whey enriches the products that contain them and avoid the culling directly in the soil, in the sewage system, rivers, and lakes, minimizing the negative impact, as discussed in this review.

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The whey is a relevant by-product in the cheese industry for being produced in large volume and for containing approximately 55% of its nutrients from milk. Its industry performance upon human nutrition products is still considered low, because the high concentration of minerals provides a low sensorial acceptation of food. Thus, beverages have been developed, mainly the fermented ones that display new flavors and aromas, aiming at recovering such important source of nutrients for the human food chain. It is observed, therefore, that the use of cheese whey enriches the products that contain them and avoid the culling directly in the soil, in the sewage system, rivers, and lakes, minimizing the negative impact, as discussed in this review.

O soro do leite é um subproduto de relevância da indústria de queijos por ser produzido em grande volume e conter aproximadamente 55% dos nutrientes do leite. O seu aproveitamento industrial em produtos da alimentação humana ainda é considerado baixo, visto que a alta concentração de minerais proporciona uma baixa aceitação sensorial dos alimentos que o contém. Dessa forma, têm-se desenvolvido bebidas, principalmente as fermentadas, que apresentam novos sabores e aromas, com o objetivo de recuperar essa importante fonte de nutrientes para a cadeia alimentar humana. Observa-se, portanto, que a utilização do soro de queijo enriquece os produtos que os contém e evita o descarte diretamente no solo, na rede pública de esgoto, rios e lagos, minimizando o impacto negativo, conforme abordado nesta revisão.

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The whey is a relevant by-product in the cheese industry for being produced in large volume and for containing approximately 55% of its nutrients from milk. Its industry performance upon human nutrition products is still considered low, because the high concentration of minerals provides a low sensorial acceptation of food. Thus, beverages have been developed, mainly the fermented ones that display new flavors and aromas, aiming at recovering such important source of nutrients for the human food chain. It is observed, therefore, that the use of cheese whey enriches the products that contain them and avoid the culling directly in the soil, in the sewage system, rivers, and lakes, minimizing the negative impact, as discussed in this review.

O soro do leite é um subproduto de relevância da indústria de queijos por ser produzido em grande volume e conter aproximadamente 55% dos nutrientes do leite. O seu aproveitamento industrial em produtos da alimentação humana ainda é considerado baixo, visto que a alta concentração de minerais proporciona uma baixa aceitação sensorial dos alimentos que o contém. Dessa forma, têm-se desenvolvido bebidas, principalmente as fermentadas, que apresentam novos sabores e aromas, com o objetivo de recuperar essa importante fonte de nutrientes para a cadeia alimentar humana. Observa-se, portanto, que a utilização do soro de queijo enriquece os produtos que os contém e evita o descarte diretamente no solo, na rede pública de esgoto, rios e lagos, minimizando o impacto negativo, conforme abordado nesta revisão.

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INTRODUÇÃO: O aumento de tecnologia e equipamentos automatizados em laboratórios de análises clínicas permitiu ampliar significativamente a capacidade de análises e processamento de informações. Entretanto, aumentou também na mesma proporção a utilização de reagentes químicos nas análises, gerando resíduos que, se descartados de forma incorreta, causam sérios danos ao meio ambiente. OBJETIVO: avaliar a informação e a conscientização dos profissionais de laboratórios de análises clínicas em relação a possíveis danos ambientais causados pelos resíduos químicos produzidos, forma de descarte adotada e interesse em receber informações relacionadas. MATERIAL E MÉTODOS: Foram realizadas entrevistas, estruturadas em questionário, para obter a quantidade de análises hematológicas realizadas na cidade de Curitiba/PR, o modo de descarte dos resíduos gerados pelos equipamentos automatizados e, também, para inferir sobre o conhecimento dos profissionais quanto à formulação das soluções, à forma recomendada de descarte e ao potencial para causar danos ao meio ambiente. RESULTADOS E CONCLUSÃO: A maioria (80 por cento) dos profissionais de laboratórios de análises clínicas acredita ser responsável pelo resíduo produzido, no entanto não possui conhecimento sobre a questão. Esse desconhecimento propicia práticas inadequadas em 47 por cento dos laboratórios pesquisados, que descartam o resíduo diretamente na rede coletora de esgotos. Para evitar a contaminação biológica, 20 por cento dos laboratórios tratam os resíduos com hipoclorito antes de descartá-los na rede coletora de esgoto, e apenas 12 por cento deles possuem tratamento para efluentes, porém esse tipo de procedimento realizado é desconhecido.

INTRODUCTION: The widespread use of technology and automated equipment in clinical laboratories has allowed to expand analysis capacity and information processing significantly. However, it has also augmented the use of chemical reagents in analyses, generating waste that, if improperly disposed, may cause serious environmental damage. OBJECTIVES: To evaluate the knowledge and awareness of clinical laboratory professionals as to the potential environmental damage caused by chemical waste, adopted forms of disposal, and interest in receiving related information. METHODS: Interviews were conducted in a structured questionnaire in order to assess the total number of blood tests performed in the city of Curitiba and the forms of waste disposal generated by automated equipment. They were also developed to infer professionals' knowledge regarding solution development, recommended ways of disposal, and potential environmental hazard. RESULTS AND CONCLUSION: The vast majority (80 percent) of professionals in clinical laboratories believes to be responsible for the produced waste, but has no knowledge on the issue. This unawareness generates inadequate practices in 47 percent of surveyed laboratories, which discard waste directly into the sewer system. In order to avoid biological contamination, 20 percent of the laboratories treat their waste with sodium hypochlorite before disposal into the sewer system, and only 12 percent have sewage treatment, though its type is unknown.

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The aim of this study was to assess of composition and structure of ichthyofauna over two distinct periods: three and eleven years after the establishment of the protected area. The results of composition and structure of the ichthyofauna of the Diamante River, sampled quarterly from November 2005 to August 2006, were compared to results obtained by Abilhoa and Bastos (2005) in studies conducted between August 1997 and December 1998. The 2.4 to 16 cm-mesh gillnets were exposed for 24 hours and checked every 8 hours. In order to characterize the ichthyofauna, patterns of species richness, diversity, evenness and frequency of occurrence of species were analyzed. A total of 673 individuals, distributed among 36 species, 13 families and four orders were sampled. Significant changes were found in ichthyofauna composition, with a reduction in diversity and evenness as compared to the previous study. The high representativeness of alien species indicates instability in the studied area, through changes in diversity, species replacement, predominance of opportunistic species, and physical changes such as silting and degradation of the body of water.

O objetivo do presente trabalho foi investigar as assembleias de peixes do ribeirão Diamante (Estação Ecológica do Caiuá), visando avaliar sua composição e estrutura, ao longo de dois períodos distintos: três e 11 anos após sua criação. Para tanto, foram comparados os resultados obtidos nas amostragens realizadas trimestralmente no presente estudo, entre novembro de 2005 e agosto de 2006, com os resultados apresentados por Abilhoa e Bastos (2005) para o período de agosto de 1997 a dezembro de 1998. Neste estudo, os aparelhos de pesca foram constituídos de redes de espera simples com malhas de 2,4 a 16 cm (entre nós opostos), expostas por 24h, com revistas a cada 8h. Para a caracterização da ictiofauna, foram analisados padrões de riqueza específica, diversidade, equitabilidade e frequência de ocorrência das espécies. Foram capturados 673 indivíduos, distribuídos em 36 espécies, 13 famílias e quatro ordens. Verificou-se significativa alteração na composição da ictiofauna do ribeirão, com redução na diversidade e equitabilidade em relação ao trabalho anterior. Observou-se alta representatividade de espécies exóticas, o que indica instabilidade na área de estudo pelas alterações na diversidade, substituição de espécies, predomínio de oportunistas e alterações físicas como assoreamento e degradação do corpo de água.

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The aim of this study was to assess of composition and structure of ichthyofauna over two distinct periods: three and eleven years after the establishment of the protected area. The results of composition and structure of the ichthyofauna of the Diamante River, sampled quarterly from November 2005 to August 2006, were compared to results obtained by Abilhoa and Bastos (2005) in studies conducted between August 1997 and December 1998. The 2.4 to 16 cm-mesh gillnets were exposed for 24 hours and checked every 8 hours. In order to characterize the ichthyofauna, patterns of species richness, diversity, evenness and frequency of occurrence of species were analyzed. A total of 673 individuals, distributed among 36 species, 13 families and four orders were sampled. Significant changes were found in ichthyofauna composition, with a reduction in diversity and evenness as compared to the previous study. The high representativeness of alien species indicates instability in the studied area, through changes in diversity, species replacement, predominance of opportunistic species, and physical changes such as silting and degradation of the body of water.

O objetivo do presente trabalho foi investigar as assembleias de peixes do ribeirão Diamante (Estação Ecológica do Caiuá), visando avaliar sua composição e estrutura, ao longo de dois períodos distintos: três e 11 anos após sua criação. Para tanto, foram comparados os resultados obtidos nas amostragens realizadas trimestralmente no presente estudo, entre novembro de 2005 e agosto de 2006, com os resultados apresentados por Abilhoa e Bastos (2005) para o período de agosto de 1997 a dezembro de 1998. Neste estudo, os aparelhos de pesca foram constituídos de redes de espera simples com malhas de 2,4 a 16 cm (entre nós opostos), expostas por 24h, com revistas a cada 8h. Para a caracterização da ictiofauna, foram analisados padrões de riqueza específica, diversidade, equitabilidade e frequência de ocorrência das espécies. Foram capturados 673 indivíduos, distribuídos em 36 espécies, 13 famílias e quatro ordens. Verificou-se significativa alteração na composição da ictiofauna do ribeirão, com redução na diversidade e equitabilidade em relação ao trabalho anterior. Observou-se alta representatividade de espécies exóticas, o que indica instabilidade na área de estudo pelas alterações na diversidade, substituição de espécies, predomínio de oportunistas e alterações físicas como assoreamento e degradação do corpo de água.