This paper aims at the determination of (1) period and area of spawning, (2) length and age at first spawning and (3) sex ratio of the 'pescada-foguete' (Macrodon ancylodon) from the southern coast of Brazil. The results obtained show that spawning occurs during October-May with a partial spawning in December and in March-April; the area of spawning was found to be between latitude 32ºS and longitude 51ºW and 52ºW. The first maturation occurs when the fish reach 25 cm long, being complete in about six months. The sex ratio found was 48% females for 52% males.