Bossemeyer, I. M. K. and Hall, G. A. B. (1980) “Determination of the time of spawing and maturation of the jundiá, rhamdia sapo, based on the gonado-somatic index (GSI) and the morphocytologic study of the gonods”, Ciência e Natura, 2(2), pp. 133–151. doi: 10.5902/2179460X24869.