106 
Fishery Bulletin 95(1), 1997 
600 
400 
200 
January 
o.o 
0.2 
0.4 
0.6 
0.8 
1.0 
600 February 
400 
200 
0.0 
0.2 
0.4 
0.6 
0.8 
1.0 
600 April 
400 
200 
0.0 
0.2 
0.4 
0.6 
0.8 
1.0 
600 
400 
200 
May 
o.o 
0.2 
0.4 
0.6 
0.8 
1.0 
600 
400 
200 
0 
June 
0.0 
0.2 
0.4 
0.6 
0.8 
1.0 
600 j u |y 
400 
200 
0 
0.0 
0.2 
0.4 
0.6 
0.8 
1.0 
600 August 
400 
200 
0 
0.0 0.2 0.4 0.6 0.8 1.0 
Oocyte diameter (mm) 
Figure 3 
Histograms of oocyte diameter of hoki from samples collected monthly on the Chatham Rise 
( Jan-Jun 1994) and west coast of the South Island ( Jul-Aug 1994) by the commercial fleet. 
Proportion of each age class developing to 
spawn 
Table 4 shows the estimated proportion of pre- 
spawners in each age class in the 1992 and 1993 May 
surveys. Table 4 also shows the percentage of fish at 
each age that were in strata where the proportion of 
developing fish could be measured (i.e. had at least 
two fish in the sample). Where this is less than 50%, 
the estimate is based on fish from only a small frac- 
tion of the population, and should not be used. Where 
it is less than 66%, the estimate might be considered 
unreliable. In 1992 there were enough data to make 
a reliable estimate of the proportion of prespawners 
