This paper presents an analysis of the fecundity and spawning of the sea trout, "pescada-foguete" (Macrodon ancylodon), of the Brazilian coast south of 29ºS, based mostly on egg count estimates of 21 specimens. The following conclusions were drawn: 1 - The eggs in the pre-spawning fish present a multimodal distribution of diameters, suggesting that they are spent successively within each spawning. 2 - The long spawning period, November-May, may be due to the partial spawning suggested above. 3 - In spent fish the ovaries contain mostly (97.5%) ovocytes less than 140 micra in diameter, plus a small quantity (2.5%) of eggs being resorbed. 4 - Correlations were drawn between fecundity (F)/total length (L) and fecundity (F)/weight (W), and are presented in equations (a) and (b) above. 5 - The value of L for F = 0 was determined and the value obtained (23.6 cm) is close to that verified for the beginning of the first maturity.