The water level in the rice field was kept between 10 and 15 cm, except in the ratoon
crop when the water levels were between 30 and 40 cm. O. niloticus (L.), C. carpio L. and
B. gonionotus (Bleeker) were stocked in all eight experiments. Trichogaster pectoralis
Regan was stocked in three experiments, whereas Osphronemus goramy Lacepoˆde,
Hypophthalmichthys molitrix (Valenciennes), Labeo rohita (Hamilton) and Clarias sp.
were stocked in one experiment. All fish were stocked at about 20 DAS. A few days
before rice seeding, trenches of all plots were treated with 15 ppm Derris root (5%
rotenone) to eradicate wild fish. A 5-mm screen at the field water inlets and a 10-mm
screen at the main water gate of the station prevented other fish from entering the fields.
The water level in the rice field was kept between 10 and 15 cm, except in the ratooncrop when the water levels were between 30 and 40 cm. O. niloticus (L.), C. carpio L. andB. gonionotus (Bleeker) were stocked in all eight experiments. Trichogaster pectoralisRegan was stocked in three experiments, whereas Osphronemus goramy Lacepoˆde,Hypophthalmichthys molitrix (Valenciennes), Labeo rohita (Hamilton) and Clarias sp.were stocked in one experiment. All fish were stocked at about 20 DAS. A few daysbefore rice seeding, trenches of all plots were treated with 15 ppm Derris root (5%rotenone) to eradicate wild fish. A 5-mm screen at the field water inlets and a 10-mmscreen at the main water gate of the station prevented other fish from entering the fields.
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