597
of Tana jal are as follows: L 45.0–67.5 m, H 5.0–
5.5 m and mesh size 45–46 mm. The gear is operated by three persons on two round-bottomed
boats. In operation, a small portion of the Beel is
encircled with the net. The fi rst person operates
the boat, the second lowers the net and the third
arranges to encircle the area to capture fi sh.
In Sone Beel, Tana jal is generally seen in
operation during the period from September to
February at a depth range of 0.50–5.0 m, usually
for catching Wallago attu .
Kar ( 1990 ) and Dey and Kar ( 1990 ) reported
that Maha jal effi ciently accounted for 17.63 %
of the IMC and 63.10 % of the trash fi sh catches
from Sone Beel; Chat jal and Ghuran jal hauled
35.40 and 30.33 % of the IMC and 18.40 and
8.20 % of the trash fi shes, respectively. On the
other hand, Tana jal accounted for 2 % of the big
catfi shes, while Dorar jal catches included 12 %
of the IMC and the exotic carps and 16 % of the
trash fi shes. Jhaki jal found to have favoured the
IMC by harvesting a big bulk (29.9 %) of the big
catfi shes and 10 % of the trash fi shes of Sone
Beel. Rekh jal hauls included 7 % of the big catfi shes. Ghuran jal and Chat jal are effective gears
to haul the IMCs. On the other hand, Tana jal and
Rekh jal are totally ineffective to trash fi shes
because of big size of their mesh.
Investment-return analysis of the encircling
gears is tabulated below:
Plate 27.20 Tana jal
The foregoing analysis reveals that Maha jal
costs the highest in its fabrication but accounted
for poor return in terms of CPGH. It, thus, portrays less viable economically.
As has been mentioned earlier, in Sone
Beel, gears exhibit seasonality in their operation. Maha jal and Tana jal are the gears
operated exclusively during the rainy season,
Investment-return analysis of the encircling gears
Fabrication cost
Average catch
Average return
Mahajan
Per head
Per head
Per head
Share (%)
Investment
return/haul
Gear type
(Rs)
(kg/haul)
(Rs/haul)
(Rs)
(Rs)
(Rs)
Maha jal
62,000.00
70.0
750.00
25.00
15,500.00
187.50
(L 750 m)
Dal jal
3,000.00
70.0
2,450.00
20.00
600.00
490.00
(L 80 m)
Chat jal
5,000.00
0.5
10.00
25.00
1,250.00
2.50
(L 110 m)
Ghuran jal
2,000.00
0.5
8.00
33.00
666.00
2.66
(L 30 m)
Jhaki jal
800.00
0.1
1.50
50.00
400.00
0.75
(D 4.0 m)
Tana jal
2,000.00
0.5
15.00
25.00
500.00
3.75
(L 55 m)
Rekh jal
700.00
0.1
3.00
50.00
350.00
1.50
(D 4.0 m)
27.3 Wetland Fish Catching Devices Exemplifi ed from a Typical Wetland in Asia
of Tana jal are as follows: L 45.0–67.5 m, H 5.0–
5.5 m and mesh size 45–46 mm. The gear is operated by three persons on two round-bottomed
boats. In operation, a small portion of the Beel is
encircled with the net. The fi rst person operates
the boat, the second lowers the net and the third
arranges to encircle the area to capture fi sh.
In Sone Beel, Tana jal is generally seen in
operation during the period from September to
February at a depth range of 0.50–5.0 m, usually
for catching Wallago attu .
Kar ( 1990 ) and Dey and Kar ( 1990 ) reported
that Maha jal effi ciently accounted for 17.63 %
of the IMC and 63.10 % of the trash fi sh catches
from Sone Beel; Chat jal and Ghuran jal hauled
35.40 and 30.33 % of the IMC and 18.40 and
8.20 % of the trash fi shes, respectively. On the
other hand, Tana jal accounted for 2 % of the big
catfi shes, while Dorar jal catches included 12 %
of the IMC and the exotic carps and 16 % of the
trash fi shes. Jhaki jal found to have favoured the
IMC by harvesting a big bulk (29.9 %) of the big
catfi shes and 10 % of the trash fi shes of Sone
Beel. Rekh jal hauls included 7 % of the big catfi shes. Ghuran jal and Chat jal are effective gears
to haul the IMCs. On the other hand, Tana jal and
Rekh jal are totally ineffective to trash fi shes
because of big size of their mesh.
Investment-return analysis of the encircling
gears is tabulated below:
Plate 27.20 Tana jal
The foregoing analysis reveals that Maha jal
costs the highest in its fabrication but accounted
for poor return in terms of CPGH. It, thus, portrays less viable economically.
As has been mentioned earlier, in Sone
Beel, gears exhibit seasonality in their operation. Maha jal and Tana jal are the gears
operated exclusively during the rainy season,
Investment-return analysis of the encircling gears
Fabrication cost
Average catch
Average return
Mahajan
Per head
Per head
Per head
Share (%)
Investment
return/haul
Gear type
(Rs)
(kg/haul)
(Rs/haul)
(Rs)
(Rs)
(Rs)
Maha jal
62,000.00
70.0
750.00
25.00
15,500.00
187.50
(L 750 m)
Dal jal
3,000.00
70.0
2,450.00
20.00
600.00
490.00
(L 80 m)
Chat jal
5,000.00
0.5
10.00
25.00
1,250.00
2.50
(L 110 m)
Ghuran jal
2,000.00
0.5
8.00
33.00
666.00
2.66
(L 30 m)
Jhaki jal
800.00
0.1
1.50
50.00
400.00
0.75
(D 4.0 m)
Tana jal
2,000.00
0.5
15.00
25.00
500.00
3.75
(L 55 m)
Rekh jal
700.00
0.1
3.00
50.00
350.00
1.50
(D 4.0 m)
27.3 Wetland Fish Catching Devices Exemplifi ed from a Typical Wetland in Asia