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

34 P. A. A. T. Jayawardane et al.
30
P. A. A. T. Jayawardane et al
% Frequency
15
10
5
0
Male : n=4600 X=12.8
Female : n=4170 X=12.43
5.8
6.6
7.4
8.2
9
9.8
10.6
11.4
12.2
13
13.8
14.6
15.4
16.2
17
17.8
18.6
Mid length (cm)
Male
Female
P.indicus
25
Male : n=14 760 X=7.47
% Frequency
20
15
10
5
0
Female : n=15 635 X=8.55
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
8.5
8.9
9.3
9.7
10.1
10.5
10.9
11.3
Mid length (cm)
Male
Female
P.dobsoni
20
Male : n=11 795 X=6.8
% Frequency
15
10
5
0
Female : n=12 600 X=7.81
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
% Frequency
20
15
10
5
0
Male : n=2 325 X=15.1
Female : n=2 754 X=17.22
11
11.8
12.6
13.4
14.2
15
15.8
16.6
17.4
18.2
Mid length (cm)
19
19.8
20.6
21.4
22.2
23
23.8
Male
Female
P. merguiensis
Figure 8. Length frequency distributions of the major shrimp species caught in the
catches of mechanised trawls : n=number of individuals X=mean length