Plasma energetic substrates and hepatic enzymes in the four-eyed fish Anableps anableps (Teleostei: Cyprinodontiformes) during the dry and rainy seasons in the Amazonian Island of Maracá, extreme north of Brazil

ABSTRACT Anableps anableps is a viviparous teleost typical from Amazon Delta estuaries. It representative of this biome in Maracá, which offers potential for biomonitoring. The aim study to apply different biomarkers males and females species verify possible seasonal influences on their physiology. To collect fish, three expeditions were carried out the rainy season April 2018 February 2019. Biometric parameters gonadosomatic (GSI), hepatosomatic (HSI), viscerosomatic (VSI) indexes calculated, blood samples taken measure triglycerides, total proteins, glucose, activity enzymes aspartate aminotransferase (AST), alanine (ALT), alkaline phosphatase (ALP). GSI higher dry season. This probably related embryogenesis process. Males show an increase biomass during season, metabolic homogeneity, plasma ALT activity. tested are biomonitoring, preliminarily suggesting that there asynchronism between A. as allocation energy resources at times life cycle.