Jones et al.: Species compositions of elasmobranchs caught by three commercial fishing methods 
375 
Table 6 
Estimates of the L 50 and L 95 at maturity, and the upper and lower 95% confidence limits (CL), for females and males of Heter- 
odontus portusjacksoni, Aptychotrema vincentiana, and Squatina australis recorded as total length (TL). For Myliobatis austra- 
lis, these values were recorded as disc length ( DL ); extrapolated values for disc widths (DW) are also provided. Estimates were 
derived by using gonadal status as an index of maturity for females and males and also by using full clasper calcification as that 
index for males. Sample sizes for females and males of each species are provided in Figure 4. 
Female (gonads) 
Male (gonads) 
Male (claspers) 
^50 
■^95 
^50 
■^95 
■^50 
•^95 
Heterodontus portusjacksoni 
Estimate 
805 
896 
593 
647 
581 
652 
Upper 95% CL 
826 
931 
605 
674 
594 
689 
Lower 95% CL 
781 
866 
579 
628 
563 
629 
Aptychotrema vincentiana 
Estimate 
798 
877 
671 
766 
654 
707 
Upper 95% CL 
815 
920 
695 
833 
676 
756 
Lower 95% CL 
774 
855 
631 
736 
618 
679 
Squatina australis 
Estimate 
823 
852 
734 
735 
721 
723 
Upper 95% CL 
842 
927 
753 
806 
753 
806 
Lower 95% CL 
771 
826 
673 
714 
674 
714 
Myliobatis australis 
Estimate 
511 
585 
399 
472 
388 
453 
Upper 95% CL 
558 
696 
416 
518 
404 
491 
Lower 95% CL 
480 
538 
376 
440 
366 
420 
Female (gonads) 
Male (gonads) 
Male (claspers) 
dw 50 
dw 95 
dw 50 
dw 95 
dw 50 
dw 95 
Myliobatis australis 
Estimate 
879 
1006 
689 
813 
670 
781 
Upper 95% CL 
960 
1195 
717 
891 
697 
845 
Lower 95% CL 
827 
926 
649 
758 
632 
724 
Table 7 
Numbers of females and males and total number of Heterodontus portusjacksoni , Aptychotrema vincentiana, Squatina australis, 
and Myliobatis australis that were caught by each fishing method and examined in the laboratory, and the percentages of indi- 
viduals with lengths less than their L 50 at maturity when using gonadal status as the index of maturity. L 50 refers to total length 
(TL 50 ), except in the case of M. australis where it refers to disc length ( DL 50 ). 
Fishing method 
Species name 
Females 
Males 
Sexes combined 
n 
% < L 50 
n 
% < L 50 
n 
% < L 50 
Trawl 
Heterodontus portusjacksoni 
121 
98 
128 
96 
249 
97 
Aptychotrema vincentiana 
182 
62 
116 
66 
298 
63 
Squatina australis 
155 
89 
169 
91 
324 
90 
Myliobatis australis 
71 
92 
83 
87 
154 
90 
Gillnet 
Heterodontus portusjacksoni 
115 
44 
76 
30 
191 
38 
Aptychotrema vincentiana 
16 
38 
20 
30 
36 
33 
Squatina australis 
22 
18 
16 
19 
38 
18 
Myliobatis australis 
14 
86 
25 
40 
39 
56 
Longline 
Heterodontus portusjacksoni 
57 
32 
19 
37 
76 
33 
Aptychotrema vincentiana 
5 
0 
1 
100 
6 
17 
Squatina australis 
— 
— 
— 
— 
— 
— 
Myliobatis australis 
11 
36 
14 
7 
25 
20 
