Rogers et al.: Effectiveness of bycatch reduction devices in Louisiana inshore waters 
561 
Table 3 
Comparison of numbers and biomass of the most abundant species collected in bycatch reduction device (BRD) nets and corre- 
sponding control nets. SD is the standard deviation of the difference. Significance levels are 0.01 (”) and 0.05 (*). n= 72. Superscripted 
letters denote significance levels of paired t-tests on log-transformed data: 0.01 (“), 0.05 ( * ). 
Numbers Biomass (g) 
Species and 
BRD 
Mean catch/tow 
Percent 
catch 
difference 
Mean catch/tow 
Percent 
catch 
difference 
Control 
BRD 
SD 
P>t-value 
Control 
BRD 
SD 
P>t-value 
Atlantic croaker 
Authement-Ledet 
58.0 
38.0 
-34 
67.9 
0.01**“ 
832.9 
509.8 
-39 
711.1 
0.01** 
Lake Arthur 
56.8 
41.6 
-27 
63.4 
0.05* 6 
783.6 
627.8 
-20 
450.9 
0.01**“ 
Cameron 
58.5 
29.6 
-49 
64.8 
0.01** 
859.8 
570.2 
-34 
524.7 
0.01** 
Eymard 
56.9 
83.6 
47 
117.6 
0.06* 
789.7 
871.3 
10 
907.3 
0.45 
Spot 
Authement-Ledet 
12.2 
5.6 
-54 
12.4 
0.01**° 
294.4 
110.7 
-62 
318.0 
0.01**“ 
Lake Arthur 
25.3 
15.2 
-40 
52.3 
0.10 
575.5 
372.7 
-35 
1,121.1 
0.13 
Cameron 
12.0 
9.8 
-18 
6.7 
0.01** 
322.5 
269.4 
-16 
221.4 
0.05* 
Eymard 
22.6 
11.2 
-50 
49.4 
0.05*° 
562.0 
234.0 
-58 
1,137.9 
0.02*“ 
Sand seatrout 
Authement-Ledet 
14.1 
8.8 
-38 
26.3 
0.09* 
101.0 
63.5 
-37 
114.9 
0.01** 
Lake Arthur 
9.8 
8.5 
-13 
9.6 
0.27 
132.1 
110.5 
-16 
138.8 
0.19 
Cameron 
13.3 
4.8 
-64 
14.5 
0.01**“ 
119.8 
69.5 
-42 
105.5 
0.01**“ 
Eymard 
17.0 
20.1 
19 
21.7 
0.22* 
165.5 
160.1 
-3 
209.1 
0.83 
Hardhead catfish 
Authement-Ledet 
22.3 
11.0 
-51 
24.0 
0.01**“ 
625.5 
244.9 
-61 
596.6 
0.01**“ 
Lake Arthur 
26.2 
20.8 
-21 
31.2 
0.14“ 
729.6 
548.4 
-25 
380.4 
0.01**“ 
Cameron 
35.3 
14.4 
-59 
61.7 
0.01**“ 
960.0 
549.1 
-43 
784.2 
0.01**“ 
Eymard 
24.6 
23.2 
-6 
51.3 
0.82 
802.0 
393.7 
-51 
1,045.0 
0.01** 
Bay anchovy 
Authement-Ledet 
29.3 
18.3 
-37 
34.6 
0.01** 
40.1 
22.1 
-45 
45.1 
0.01*** 
Lake Arthur 
23.3 
14.7 
-37 
30.2 
0.02** 
35.3 
25.0 
-29 
49.3 
0.08* 
Cameron 
27.8 
7.0 
-75 
31.2 
0.01**“ 
36.7 
9.5 
-74 
41.8 
0.01**“ 
Eymard 
35.8 
65.4 
83 
67.4 
0.01**“ 
43.4 
80.8 
86 
79.8 
0.01**“ 
Gulf menhaden 
Authement-Ledet 
12.8 
10.0 
-22 
18.5 
0.20 
135.2 
110.8 
-18 
170.0 
0.23 
Lake Arthur 
7.8 
8.5 
9 
14.2 
0.67 
96.0 
106.7 
11 
161.7 
0.57 
Cameron 
7.6 
7.1 
-7 
12.5 
0.71 
82.1 
82.0 
0 
126.3 
0.99 
Eymard 
8.5 
12.1 
42 
22.8 
0.19 
96.0 
109.7 
14 
173.0 
0.50 
Blue crab 
Authement-Ledet 
9.9 
9.0 
-9 
6.9 
0.25 
430.3 
352.1 
-18 
353.3 
0.06 
Lake Arthur 
9.0 
6.4 
-28 
7.6 
0.01** 
378.6 
295.9 
-22 
326.0 
0.03* 
Cameron 
11.4 
9.3 
-19 
15.8 
0.24 
571.0 
457.2 
-20 
888.7 
0.28 
Eymard 
10.5 
9.3 
-12 
6.3 
0.09 
574.4 
410.0 
-29 
647.9 
0.03* 
Brown shrimp 
Authement-Ledet 
60.0 
46.7 
-22 
52.0 
0.03** 
332.4 
270.7 
-19 
197.7 
0.01** 
Lake Arthur 
64.3 
48.2 
-25 
54.6 
0.01**“ 
333.8 
268.8 
-19 
181.7 
0 oi*** 
Cameron 
78.5 
64.0 
-19 
72.4 
0.09 
375.6 
315.6 
-16 
170.2 
0.01** 
Eymard 
73.4 
99.1 
35 
85.8 
0.01** 
356.3 
438.6 
23 
273.4 
0.01** 
White shrimp 
Authement-Ledet 
24.6 
22.3 
-9 
22.9 
0.40 
150.3 
146.3 
-3 
116.5 
0.77 
Lake Arthur 
28.7 
22.7 
-21 
20.9 
0.02*“ 
179.6 
156.2 
-13 
137.4 
0.15“ 
Cameron 
32.0 
28.8 
-10 
24.6 
0.28 
202.9 
184.5 
-9 
124.1 
0.21 
Eymard 
25.4 
37.0 
46 
47.5 
0.04** 
160.8 
206.2 
28 
209.1 
0.07 
opening while the nets were being towed. Few fish 
were observed escaping from the Cameron and Lake 
Arthur BRD openings during these tests. 
Although each BRD net contained escape openings, 
smaller species, such as the bay anchovy, could have 
escaped through the codend meshes. The devices may 
