Bio-Drum (Rotating Biological Contactor, RBC): A type of Biological Filter consisting of a rotating drum packed with high-surface-area plastic media half-submerged in water.
As it rotates, nitrifying bacteria (Nitrosomonas and Nitrobacter) alternate between wastewater and atmospheric air, oxidizing toxic ammonia into nitrate.
Correct Option: Option 1 (Biological).
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22
ICAR JRF Fisheries Technology And Engineering 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
In recirculating aquaculture systems (RAS), a daily partial water exchange is necessary to control ——————-—-
In closed Recirculating Aquaculture Systems (RAS), aerobic nitrifying biofilters continuously convert toxic ammonia to nitrite, and nitrite to nitrate ($NO_3^-$).
Because most commercial RAS lack anaerobic denitrification units, non-toxic nitrate slowly accumulates over time ($\gt 100-200\text{ mg/L}$).
daily partial water exchange ($5\% - 10\%$) is standardly performed to flush out and control systemic nitrate buildup.
Correct Option: Option 1 (Nitrate).
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23
ICAR JRF Fisheries Technology And Engineering 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
What is used to secure a cage in a desired position at desired depth and place?
In open sea and reservoir fish cage farming, the Mooring System (comprising heavy fluke/plow anchors, anchor chains, mooring lines, buoys, and bridles) secures the floating collar and net cage in a fixed position, absorbing wind, wave, and tidal drag forces.
Correct Option: Option 3 (Mooring system).
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