30 



Fishery Bulletin 97(1), 1999 



"5) 



UJ 

 O 



— 



1900 



~B~ Observed cpue 

 LMSE 



1905 



1910 



1915 



1920 



Year 



1925 



1930 



1935 



1940 



Figure 2 



Catch per unit of effort observed and predicted by the LMSE method for the 

 NSW eastern rock lobster fishery in the period of 1903 to 1936. 



CPUEs in these two fishing seasons 

 increased greatly and abruptly from 

 the previous years, followed by an 

 equally abrupt decrease (Fig. 4). 



Distributions for parameters of 

 the model estimated with the 

 bootstrapped LMSE method for pe- 

 riod II are presented in Figure 5. 

 The median value of the stock bio- 

 mass in year 1969-70 was 3808 t, 

 13% lower than the corresponding 

 LMSE estimate. The estimated 

 median value of Tj, was 0.172 

 (Table 3), 227f lower than the 

 LMSE-estimated Tjj. The median 

 value of (7jj was only 10% of that 

 estimated for Qj. This resulted 

 from different units of fishing ef- 

 forts used in calculating the abun- 

 dance index (CPUE) in the two 



2.000 2.800 3 400 4,000 4.600 5,200 6,600 6 400 7, COO 7,600 



K(t) 



m 

 o 



00 06 0.12 18 24 0.30 36 



60 80 110 140 170 200 



q X 10°(1 /vessel) Maximum sustainable yield (t) 



Figure 3 

 The distributions of the parameters estimated with the bootstrapped least median of squared errors (LMSE) for the period of 

 1903 to 1936. 



