288 



Fishery Bulletin 98(2) 



25 



140000 



120000 



100000 



80000 



60000 



40000 



20000 







25 



140000 



120000 



100000 



80000 



60000 



40000 



20000 







1994 



27 



29 



31 



33 



35 



BF = 0973 FL ' 

 r^ = 0,33 



1995 



27 



29 



31 



33 



35 



BF = 3.8152 Fi' 

 r' = 038 



1997 



25 



27 29 31 33 

 Fork length (cm) 



35 



140000 



120000 



100000 



80000 



60000 



40000 



20000 







140000 



120000 



100000 



80000 



60000 



40000 



20000 







BF = 176 38 7Tf- 34318 

 /•^ = 38 



300 400 500 600 700 800 



300 400 500 600 700 800 



BF = 185 81 7T*'-18623 

 r^ = 052 



300 400 500 600 700 800 

 Ovary-free female weight (g) 



Figure 4 



Batch fecundity as a function of fork length and total weight (without ovary) obtained from the different 

 sampled years. 



ies about egg quality of B. aitrea compared with that 

 of £. anchoita should include determination of oocyte 

 dry weight, ash dry weight, and total lipid and fatty 

 acid composition. 



Acknowledgments 



This research was conducted within the INIDEP's 

 Coastal Project. We thank Teresa Carle and Haraldo 

 E. Christiansen for the preparation of histological 

 sections and Marcela Tobio who was responsible for 

 the photographic procedures. We would also like to 

 thank Norberto Scarlato and two anonymous review- 

 ers for a critical review of our manuscript. 



Literature cited 



Acha, E. M., and G. J. Macchi. 



2000. .Spawning of Brazilian menhaden. Brevoortia aurea. 

 in the Rio de la Plata estuary off Argentina and Uruguay. 

 Fi.sh. Bull. 98:227-235. 

 Ahrenholz, D. W. 



1991. Population biology and life history of the North Amer- 

 ican menhadens. Brevoortia spp. Mar. Fish. Rev. 53(4): 

 .3-19. 

 Alheith, J., V. H. Alarcon, and B. J. Macewicz. 



1984. .Spawning frequency and sex ratio in the Peruvian 

 anchovy Engraulia nngerif;. CalCOFI Rep. 25:4.3-52. 

 Anonymous. 



1998. Capturas maritimas totales 1997. Ministerio de Eco- 

 nomia y Obras y Servicios Piiblicos. Secretaria de Agricul- 

 tura, Ganaderia, Pesca y Alimentacion. Subsecretaria de 



