Rigor mortis e aspectos reprodutivos de Acaris Bodós (Ptrygoplichthys pardalis), capturados no Rio Tapajós, Pa, Brasil

Abstract

This work aimed to analyze some aspects of the reproductive biology of acaris-bodós, Ptrygoplichthys pardalis, evaluating the Fulton condition factor (k), gonadosomatic index (IGS), sexual ratio and stage of sexual maturation, and also aimed to evaluate the resolution of rigor mortis, in fish sacrificed under stressful conditions. Twenty fish were captured in the Tapajós River, 10 of which were immediately killed and 10 were sacrificed under transport stress conditions for rigor mortis evaluation. We also measured weight and total length for determination of the Fulton condition factor (k), as well as the gonads, sexed, and heavy, for determination of the gonadosomatic index (IGS) and sex ratio, and classified for the maturation stage sexual. Fish slaughtered after stress reached rigor mortis in less time, in relation to fish slaughtered immediately. The fish were in good nutritional status, presenting k values of 1,02 ± 0,08, sex ratio of females: males of 9: 1, gonadosomatic index (IGS) of 0,244 ± 0,068%, and presented a maturation stage as females spawned or emptied in the rainy season.