Milton and Blaber: Sexual maturity and spawning of tuna baitfish in the Solomon Islands 



225 



Table 2 



Minimum gonosomatic index (GSI) values used as criteria to estimate proportion of sexually mature fish (stage 3) and proportion of 

 fish spawning (late stage 5) at each site, and minimum size (SL, mm) of fish in spawning condition (based on values obtained from 

 fish examined histologically). N = sample size. 



60 



30 40 50 60 



Length (mm) 



70 



70 



100 



(b)£ heterolobus 



100 



J* 60 



60 



S. delicatulus 

 A. zosterophora 



40 50 60 



Length (mm) 



70 



70 



Figure 4 



Logistic curves of best fit which describe the change in proportion of ripe eggs (stage 4) in the ovaries 

 of six species of baitfish with increasing fish length. 



