Oxygen level in the tanks should exceed 3
mg/l. If the magur fish tanks are supplied with turbid water it is advisable to
filter it with through a sand filter and to aerate the tanks at night for maintaining
oxygen level by using an air blower The aeration grid should be one feet above
the bottom of the tank so that mud can settle at the bottom..Magur requires
mud. .
A tank containing such a fish group required
approximately 5 liter/min water supply. Depth of fish tanks should be 0.5–0.75
m. Let us take water depth 0.75 meter.The freeboard of the tank should be 0.5
meter so that fish don’t jump out. So total depth of tank is 1.25 Meter. Volume
of the tank should be 10,000 liter. Normally it should be square in size. So
length and width of tank will be 4 Meter by 4 meter.
For avoiding the direct contact between tank wall
and fish it is better to cover the inner surface of tank with polyethylene
sheet.
Inlet water should be
sprayed in the tank from a perforated PVC tube throughout the length.
Outlet water will overflow
from a overflow weir at the outlet side. The top of the overflow weir will be
covered by net/mesh. The proper mesh size is 1.0–1.5 mm
Most efficient way of
plankton maintenance is frequent manuring with small doses of poultry or cattle
manure. In addition to plankton maintenance, frequent manuring maintains an
active and effective bacterial population in pond water. It facilitates
decomposition of metabolites hampering fish growth. Poultry (5–15 kg/bigha) or
cattle (10–20 kg/bigha) manure is sufficient for frequent treatment of pond.
Daily brushing of wall and
bottom of the tanks is essential. Moreover, when there is deterioration in
water quality, 10–20 % fresh water replacement is suggested.
Lime is used for killing
different living organisms remaining in muddy pools after dewatering of ponds.
IF MAGUR SURVIVES IN THE POLISHING TANK, IT MEANS
THE ETP IS RUNNING PROPERLY.
TANK SIZE : 4 x 4 x 1.25
Meter. Water depth = 0.75 Meter. Free Board=0.5 M
