Arkhipkin: Intrapopulation structure oU/lex argentinus dunng its feeding period over the Patagonian Shelf 



Females 



Males 



Feb, I 



!00 WO ZOO 2S0 300 360 40O 



Feb, I 



Feb. I 



wo wo 200 2B0 300 3S0 400 



Feb, II 



wo wo aoo MO *oo 3so 400 



Feb, III 



o 

 c 

 <u 



3 

 CT 

 0) 



wo wo (00 ISO 300 3*0 400 



Feb, III 



100 wo SCO SBO 300 3«0 400 WO WO 100 230 300 380 400 



Mar, I 



Mar, I 



100 wo 2O0 ISO 300 360 400 100 WO tOO 230 300 3SO 400 



Mar, II 



wo wo 200 2S0 300 360 400 



Mantle length (mm) 



Mar, II 



100 wo 200 260 300 3SO 400 



Mantle length (mm) 



Age structure 



Feb, I 



J J * • o 



* u J J A a o 



Feb, III 



Mar, I 



1 - •• (••) 



A M J J A a o 



Mar. II 



Hatching month 



Figure 7 



Length-frequency and hatching month compositions (age structures) of ///ex argentinus of the fishery region of 47-49°S within the 

 EEZA in February-March 1991. Symbols are the same as in Figure 4. 



was confirmed both by similar hatching-month com- During the feeding period, winter-hatched /. argen- 



positions and prominent peaks of the CPUE in both tinus grew rapidly and matured — males maturing at 



regions. yoimger ages (from one to two months) than females 



