PRESENT STATUS OF THE SHRIMP TRAWL FISHERY IN THE ...

Shrimp trawl fishery in the west coast of Sri Lanka 33
% Frequency
15
10
5
0
Male : n=3649 X=11.4
Female : n=3811 X=11.34
5.8
6.6
7.4
8.2
9
9.8
10.6
11.4
12.2
13
13.8
Mid length (cm)
14.6
15.4
16.2
17
17.8
18.6
Male
Female
P.indicus
% Frequency
25
20
15
10
5
0
Male : n=19 996 X=7.03
Female : n=15 209 X=7.51
3.3
3.7
4.1
4.5
4.9
5.3
5.7
6.1
6.5
6.9
7.3
7.7
8.1
Mid length (cm)
8.5
8.9
9.3
9.7
10.1
10.5
10.9
11.3
Male
Female
P.dobsoni
20
Male : n=10 051 X=6.96
% Frequency
15
10
5
0
Female : n=16 357 X=7.3
3.3
3.7
4.1
4.5
4.9
5.3
5.7
6.1
6.5
6.9
7.3
7.7
Mid length (cm)
8.1
8.5
8.9
9.3
9.7
10.1
10.5
10.9
Male
Female
P.coromandelica
20
Male : n=2265 X=15.1
% Frequency
15
10
5
Female : n=2234 X=16.86
0
9.8
10.6
11.4
12.2
13
13.8
14.6
15.4
16.2
17
17.8
Mid length (cm)
18.6
19.4
20.2
21
21.8
22.6
Male
Female
P. merguiensis
Figure 7. Length frequency distributions of the major shrimp species caught in the catches
of non-mechanised trawls : n=number of individuals X=mean length