{"id":2408,"date":"2025-07-10T09:03:21","date_gmt":"2025-07-10T12:03:21","guid":{"rendered":"https:\/\/www.ufrgs.br\/ecotox\/?p=2408"},"modified":"2025-07-10T14:07:30","modified_gmt":"2025-07-10T17:07:30","slug":"pimephales-promelas-ele-pode-nao-ser-bonito-mas-e-um-excelente-modelo","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/ecotox\/pimephales-promelas-ele-pode-nao-ser-bonito-mas-e-um-excelente-modelo\/","title":{"rendered":"Pimephales promelas: ele pode n\u00e3o ser bonito, mas \u00e9 um excelente modelo"},"content":{"rendered":"<p><\/p>\n<p data-start=\"209\" data-end=\"314\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignleft wp-image-2409\" src=\"https:\/\/www.ufrgs.br\/ecotox\/wp-content\/uploads\/2025\/07\/Male-fathead-minnow-head.webp\" alt=\"\" width=\"474\" height=\"304\" srcset=\"https:\/\/www.ufrgs.br\/ecotox\/wp-content\/uploads\/2025\/07\/Male-fathead-minnow-head.webp 780w, https:\/\/www.ufrgs.br\/ecotox\/wp-content\/uploads\/2025\/07\/Male-fathead-minnow-head-150x96.webp 150w, https:\/\/www.ufrgs.br\/ecotox\/wp-content\/uploads\/2025\/07\/Male-fathead-minnow-head-768x492.webp 768w, https:\/\/www.ufrgs.br\/ecotox\/wp-content\/uploads\/2025\/07\/Male-fathead-minnow-head-468x300.webp 468w, https:\/\/www.ufrgs.br\/ecotox\/wp-content\/uploads\/2025\/07\/Male-fathead-minnow-head-330x212.webp 330w\" sizes=\"(max-width: 474px) 100vw, 474px\" \/><\/p>\n<p>Por Dr. Alexandre Arenzon \u2013 10\/07\/25<\/p>\n<p>Ele pode n\u00e3o ser um modelo de beleza, mas certamente \u00e9 um excelente modelo de organismo-teste.<\/p>\n<p>Na ecotoxicologia aqu\u00e1tica, escolher a esp\u00e9cie modelo ideal pode fazer toda a diferen\u00e7a \u2014 seja porque sua sensibilidade representa os demais organismos do ambiente aqu\u00e1tico, seja por permitir que diferentes m\u00e9todos de ensaio sejam empregados, gerando resultados representativos.<\/p>\n<p>Origin\u00e1rio da Am\u00e9rica do Norte e adaptado a condi\u00e7\u00f5es de laborat\u00f3rio, o fathead minnow (<em>Pimephales promelas<\/em>) tem desempenhado um papel crucial na compreens\u00e3o dos efeitos de subst\u00e2ncias qu\u00edmicas nos ecossistemas aqu\u00e1ticos de \u00e1gua doce. Sua import\u00e2ncia est\u00e1 relacionada a uma s\u00e9rie de caracter\u00edsticas que o tornam ideal para ensaios padronizados: ciclo de vida curto, facilidade de cultivo em laborat\u00f3rio, sensibilidade a contaminantes e ampla base de dados toxicol\u00f3gicos dispon\u00edveis.<\/p>\n<p>Apesar de sua ampla utiliza\u00e7\u00e3o regulat\u00f3ria na Am\u00e9rica do Norte \u2014 onde \u00e9 um dos pilares para a avalia\u00e7\u00e3o de risco ambiental \u2014, a aplica\u00e7\u00e3o do <em>Pimephales promelas<\/em> no Brasil ainda enfrenta desafios. Duas normas da ABNT o indicam como organismo-teste para ensaios de toxicidade aguda e cr\u00f4nica. Contudo, sendo uma esp\u00e9cie ex\u00f3tica, sua importa\u00e7\u00e3o requer processos de autoriza\u00e7\u00e3o pr\u00e9via complexos. Isso contrasta com o peixe-zebra (<em>Danio rerio<\/em>), de origem asi\u00e1tica e igualmente presente nas normas da ABNT, mas comercializado livremente no Brasil.<\/p>\n<p>Os m\u00e9todos de cultivo do <em>P. promelas<\/em> s\u00e3o bem definidos e vi\u00e1veis para implementa\u00e7\u00e3o em laborat\u00f3rio. Essa caracter\u00edstica permite uma produ\u00e7\u00e3o eficiente de organismos, suprindo a demanda para os mais diversos tipos de ensaios toxicol\u00f3gicos.<\/p>\n<p>Do ponto de vista regulat\u00f3rio, a United States Environmental Protection Agency (USEPA) emprega amplamente ensaios de toxicidade aguda (sobreviv\u00eancia) e cr\u00f4nica (sobreviv\u00eancia e crescimento corporal) com <em>Pimephales promelas<\/em>. Al\u00e9m disso, metodologias est\u00e3o dispon\u00edveis para avalia\u00e7\u00e3o de est\u00e1gios iniciais do desenvolvimento, reprodu\u00e7\u00e3o e para investigar os efeitos de subst\u00e2ncias qu\u00edmicas classificadas como desreguladores end\u00f3crinos. A robustez e a aceita\u00e7\u00e3o internacional desses m\u00e9todos refor\u00e7am a credibilidade dos dados gerados por meio deste modelo.<\/p>\n<p>No Laborat\u00f3rio de Ecotoxicologia da UFRGS, aprimoramos constantemente o m\u00e9todo de cultivo do <em>Pimephales promelas<\/em>, garantindo maior taxa de eclos\u00e3o e sobreviv\u00eancia dos alevinos produzidos. Al\u00e9m disso, estamos implementando o m\u00e9todo de avalia\u00e7\u00e3o com os est\u00e1gios iniciais do desenvolvimento e desenvolvendo ensaios comportamentais de f\u00e1cil implementa\u00e7\u00e3o, contribuindo para ampliar o uso dessa esp\u00e9cie em estudos ecotoxicol\u00f3gicos no Brasil.<\/p>\n<p><strong>Refer\u00eancias:<\/strong><\/p>\n<ol>\n<li>Ankley, G.T., Jensen, K.M., Kahl, M.D., Korte, J.J. and Makynen, E.A. (2001). Description and evaluation of a short-term reproduction test with the fathead minnow (Pimephales promelas). Environmental Toxicology and Chemistry, 20: 1276-1290. https:\/\/doi.org\/10.1002\/etc.5620200616<\/li>\n<li>Ankley GT, Villeneuve DL. The fathead minnow in aquatic toxicology: past, present and future. Aquatic Toxicology. 2006 Jun 10;78(1):91-102. doi: 10.1016\/j.aquatox.2006.01.018.<\/li>\n<li>S. Environmental Protection Agency. (2002). Method 1001.0: Fathead Minnow, Pimephales promelas, Larval Survival and Teratogenicity Test; Chronic Toxicity. EPA-821-R-02-013.<\/li>\n<li>S. Environmental Protection Agency. (2002). Fathead Minnow (Pimephales promelas) Larval Survival and Growth Toxicity Tests. EPA-821-R-02-013.<\/li>\n<\/ol>\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Conhe\u00e7a um pouco mais sobre esse organismo-teste que funciona excepcionalmente bem como modelo em an\u00e1lises ambientais.<\/p>\n","protected":false},"author":1,"featured_media":2409,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"aside","meta":[],"categories":[9,6],"tags":[],"post_folder":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Conhe\u00e7a um pouco mais sobre esse organismo-teste que funciona excepcionalmente bem como modelo em an\u00e1lises ambientais.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"gerente\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.ufrgs.br\/ecotox\/pimephales-promelas-ele-pode-nao-ser-bonito-mas-e-um-excelente-modelo\/\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO 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