214 
Fishery Bulletin 95(2), 1 997 
Table 1 
Summaries of two-tailed paired f-tests in a series of comparisons of various secondary BRD’s in experiment 1. ** = significant 
(P<0.01); * = significant (P<0.05); n = the number of replicates that had sufficient data available for analysis (i.e. >2 fish in 8 
replicates). 
Allerio Bros. 
vs. EMF 
Allerio Bros. vs. square- 
mesh 
Allerio Bros. vs. fisheye 
Paired f-value 
P 
n 
Paired f-value 
P 
n 
Paired f-value 
P 
n 
Wt. of prawns 
-0.602 
0.559 
12 
0.193 
0.850 
12 
0.689 
0.505 
12 
Wt. of total bycatch 
-0.967 
0.354 
12 
-1.827 
0.095 
12 
0.958 
0.358 
12 
No. of fortesque 
0.000 
0.999 
9 
0.886 
0.398 
10 
2.200 
0.052 
11 
No. of noncommercial sp. 
-0.860 
0.407 
12 
-2.46 
0.031* 
12 
-1.146 
0.276 
12 
No. of commercial sp. 
-0.232 
0.821 
12 
1.517 
0.157 
12 
-1.698 
0.120 
12 
Square-mesh 
vs. EMF 
Fisheye vs. square-mesh 
Fisheye vs. 
EMF 
Paired f-value 
P 
n 
Paired f-value 
P 
n 
Paired f-value 
P 
n 
Wt. of prawns 
-0.225 
0.826 
12 
-1.36 
0.200 
12 
-1.795 
0.100 
12 
Wt. of total bycatch 
-0.318 
0.756 
12 
-1.821 
0.095 
12 
-0.513 
0.618 
12 
No. of fortesque 
0.808 
0.440 
10 
-0.683 
0.544 
8 
-0.455 
0.659 
10 
No. of noncommercial sp. 
1.216 
0.249 
12 
-1.431 
0.180 
12 
-1.383 
0.194 
12 
No. of commercial sp. 
-0.890 
0.392 
12 
-0.364 
0.722 
12 
-1.190 
0.256 
12 
Table 2 
Summaries of one-tailed paired f-tests in a series of comparisons of various BRD’s in experiment 2. Ng = Nordmpre grid, 
significant (P<0.01); * = significant (P<0.05); n = the number of replicates that had sufficient data available for analysis (i. 
fish in 8 replicates). 
** _ 
e. >2 
Standard Ng vs. 
blubber chute 
EMF vs. blubber chute 
Fisheye vs. blubber chute 
Paired f-value 
P 
n 
Paired f-value 
P 
n 
Paired t-value P 
n 
Wt. of prawns 
2.864 
0.004** 
23 
3.764 
0.0005** 
23 
2.020 
0.027* 
23 
Wt. of total bycatch 
3.515 
0.001** 
23 
2.930 
0.003** 
23 
3.306 
0.002** 
23 
Wt. of large tooth flounder 
0.979 
0.173 
14 
0.729 
0.239 
14 
1.394 
0.103 
8 
No. of large tooth flounder 
0.061 
0.476 
14 
-0.879 
0.802 
14 
0.747 
0.239 
8 
No. of fortesque 
0.286 
0.389 
19 
-0.261 
0.601 
20 
0.761 
0.228 
18 
No. of narrow banded sole 
1.064 
0.164 
8 
— 
— 
— 
1.440 
0.090 
10 
No. of bridled goby 
-0.414 
0.654 
8 
— 
— 
— 
-0.078 
0.531 
11 
No. of catfish 
— 
— 
— 
— 
— 
— 
3.490 
0.003** 
10 
No. of noncommercial sp. 
2.626 
0.007** 
23 
2.040 
0.026* 
23 
1.931 
0.033* 
22 
No. of commercial sp. 
-1.190 
0.876 
23 
0.000 
0.500 
23 
0.282 
0.390 
23 
Standard Ng vs. fisheye 
Standard Ng 
vs. EMF 
Paired t-value 
P 
n 
Paired f-value 
P 
n 
Wt. of prawns 
0.618 
0.271 
23 
-1.418 
0.914 
23 
Wt. of total bycatch 
0.721 
0.239 
23 
0.512 
0.307 
23 
Wt. of large tooth flounder 
0.410 
0.346 
9 
-0.507 
0.689 
13 
No. of large tooth flounder 
1.835 
0.052 
9 
-0.456 
0.672 
13 
No. of fortesque 
-0.647 
0.736 
16 
-0.128 
0.449 
19 
No. of narrow banded sole 
-0.147 
0.556 
9 
0.741 
0.241 
8 
No. of bridled goby 
— 
— 
— 
3.468 
0.004** 
8 
No. of catfish 
— 
— 
— 
— 
— 
— 
No. of noncommercial sp. 
0.530 
0.300 
23 
2.688 
0.007* 
23 
No. of commercial sp. 
1.156 
0.130 
23 
0.755 
0.229 
23 
