科研之友
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摘要
This work analyzes the morphological alterations in Brachyplatystoma rousseauxii gills and evaluates whether this species can be considered an environmental monitoring biomarker of Guajar芍 Bay. Sampling was carried out in four areas around Bel谷m, Brazil, in four annual periods: dry/wet season, wet season, wet/dry season and dry season. Water pH, temperature and suspended material were evaluated. A total of 36 specimens were collected. The second right gill arch of each animal was removed and immediately fixed and processed for histopathology analysis with light microscopy. The physicochemical analysis of the water during the study period showed slight acidity, temperature and material in suspension within normal levels. Histopathological analysis of the gills from 14 individuals from area I presented no alterations, and only 2 individuals from this area presented some significant type of alteration. In contrast, all individuals captured in areas II, III, and IV presented at least one of the following alterations: aneurism-like alterations, epithelial elevation, infiltration, cell proliferation and cell hypertrophy. Based on the gill histopathological analysis, this organ is considered a good biomarker and the native species B. rousseauxii could be used as a bioindicator for environmental monitoring. O objetivo deste trabalho foi analisar as altera es morfol車gicas branquiais em Brachyplatystoma rousseauxii e verificar se esta esp谷cie pode ser considerada como indicador biol車gico para o monitoramento ambiental da ba赤a do Guajar芍. As coletas aconteceram em quatro 芍reas ao redor da cidade de Bel谷m: I (controle), II, III e IV (forte influ那ncia antr車pica), nos quatro per赤odos anuais: esta o seco/chuvoso, esta o chuvoso, esta o chuvoso/seco e esta o seco. Nesses per赤odos foram medidos pH, temperatura e material em suspens o. Foram capturados 36 exemplares. O segundo arco branquial direito de cada animal foi retirado, imediatamente fixado e processado para an芍lise histopatol車gica. A an芍lise f赤sico-qu赤mica da 芍gua revelou pH levemente 芍cido, a temperatura e o material em suspens o se encontravam nos parametros de normalidade. As an芍lises histopatol車gicas das branquias de 14 animais da 芍rea I n o apresentaram altera es branquiais e somente dois revelaram algum tipo de altera o. Todos os indiv赤duos capturados nas 芍reas II, III e IV apresentaram pelo menos uma das seguintes altera es: aneurisma, eleva o epitelial, infiltra o, prolifera o celular, fus o lamelar e hipertrofia celular. De acordo com as an芍lises histopatol車gicas branquiais, este 車rg o 谷 cons
