582 
Fishery Bulletin 95(3), 1997 
Table 2 
Trawl stations used for estimation of total annual fecundity for the AEPM and fecundity reduction for the DFRM June-July 1993 
on Ritchie Hill (R. Hill) and North Hill (N. Hill) (Fig. 2B). Catches taken on 22 June and 11 and 13 July were from commercial 
tows and catch sizes were unknown. No. staged = number of fish staged; Immat. = immature; Prop, active = proportion of active fish. 
Date 
Site 
Catch 
(kg) 
No. 
staged 
Immat. 
Stage 3 
Stage 4 
Stage 5 
Stage 8 
Stage 6 
Prop. 
active 
AEPM 
8 Jun 
R.Hill 
67 
26 
0 
24 
2 
0 
0 
0 
1.00 
8 Jun 
R.Hill 
30 
9 
0 
8 
1 
0 
0 
0 
1.00 
9 Jun 
R.Hill 
980 
95 
0 
78 
15 
0 
0 
2 
0.98 
9 Jun 
R.Hill 
980 
95 
0 
78 
15 
0 
0 
2 
0.98 
11 Jun 
R.Hill 
35 
10 
0 
9 
1 
0 
0 
0 
1.00 
11 Jun 
R.Hill 
239 
88 
2 
70 
11 
3 
2 
0 
1.00 
11 Jun 
N.Hill 
7,494 
165 
2 
125 
33 
4 
1 
0 
1.00 
11 Jun 
R.Hill 
549 
81 
1 
67 
13 
0 
0 
0 
1.00 
14 Jun 
R.Hill 
122 
41 
1 
28 
7 
4 
1 
0 
1.00 
14 Jun 
R.Hill 
103 
31 
3 
22 
5 
0 
1 
0 
1.00 
14 Jun 
R.Hill 
573 
75 
0 
51 
17 
3 
4 
0 
1.00 
15 Jun 
R.Hill 
1,195 
77 
0 
51 
21 
1 
4 
0 
1.00 
15 Jun 
R.Hill 
82 
23 
0 
10 
8 
2 
3 
0 
1.00 
16 Jun 
R.Hill 
47 
14 
1 
9 
2 
0 
2 
0 
1.00 
16 Jun 
N.Hill 
3,634 
63 
1 
25 
23 
10 
3 
1 
0.98 
17 Jun 
R.Hill 
21,478 
214 
0 
90 
96 
24 
4 
0 
1.00 
17 Jun 
R.Hill 
215 
63 
2 
30 
21 
9 
1 
0 
1.00 
DFRM 
20 Jun 
R.Hill 
23,535 
139 
0 
31 
85 
22 
1 
0 
1.00 
22 Jun 
R.Hill 
unknown 
107 
0 
19 
83 
4 
1 
0 
1.00 
27 Jun 
R.Hill 
7,218 
83 
0 
6 
26 
39 
10 
2 
0.98 
27 Jun 
R.Hill 
33,975 
227 
0 
10 
128 
78 
8 
3 
0.99 
30 Jun 
R.Hill 
19,405 
135 
0 
3 
50 
69 
8 
5 
0.96 
2 Jul 
R.Hill 
7,797 
45 
0 
3 
12 
22 
5 
3 
0.93 
4 Jul 
R.Hill 
2,936 
147 
0 
1 
67 
50 
13 
16 
0.89 
6 Jul 
N.Hill 
25,400 
56 
0 
0 
7 
27 
10 
12 
0.79 
6 Jul 
R.Hill 
402 
83 
0 
0 
2 
57 
19 
5 
0.94 
11 Jul 
R.Hill 
unknown 
31 
0 
0 
2 
15 
3 
11 
0.65 
13 Jul 
R.Hill 
unknown 
77 
0 
0 
6 
31 
11 
29 
0.62 
where n ; . = number of fish of ovarian group j at sta- 
tion i; and 
r if = mean fecundity (eggs/kg) of fish of ova- 
rian group j at station i. 
The mean fecundities/kg of fish of ovarian groups 1 
and 2 (r. ,) were estimated as 
f J 
m 
*=1 
where e ( jk = total fecundity of the £th fish of group j 
in the fecundity sample from station i 
(adjusted by the gonad wall proportions 
of total ovary weight in Appendix 4); 
w ijk = body weight (kg) of the kth. fish of 
group j in the fecundity sample from 
station i\ and 
m i f = number of fish of group j in the fecun- 
dity sample from station i. 
The R ’ s from the 11 DFRM trawls were fitted with 
a linear regression against time (weighted by the 
total number of fish in the ovarian-stage sample for 
each R t ) to estimate D, which is the mean daily fe- 
cundity (eggs/(kg x day)) for mature fish. The CV of 
D was estimated as the standard error of the slope 
of the regression, divided by the slope. 
Biomass of spawning females 
The biomass of spawning females 5 , was calculated 
by using the DFRM model given above. The CV of 
