Pokkali: A traditional, salt-tolerant, deepwater paddy cultivar cultivated in the coastal wetlands of Kerala, India.
Pokkali paddy plants can tolerate coastal salinity up to $6 - 8\text{ ppt}$ during the low-salinity southwest monsoon season (June to October).
During the high-salinity summer months (November to April, $15-30\text{ ppt}$), the fields alternate to rotational brackishwater shrimp culture (Penaeus monodon, Metapenaeus dobsoni).
Correct Option: Option 1 (6-8 ppt).
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Q.2
Aquaculture- ICAR JRF/SRF 2024 (Q.60)
MCQ (Single Correct)+4−1
In which of the carp culture systems fishes are cultured mostly under natural feed?
Extensive Carp Culture: Characterized by low stocking densities ($1,000 - 3,000\text{ fingerlings/ha}$), minimal or no external artificial feeding, and reliance almost entirely on natural pond food organisms (phytoplankton, zooplankton, benthos) generated through basic pond fertilization.
Semi-intensive incorporates supplementary feeds, and intensive relies $100\%$ on formulated balanced pellets.
Correct Option: Option 3 (Extensive).
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Q.3
Aquaculture- ICAR JRF/SRF 2024 (Q.89)
MCQ (Single Correct)+4−1
In raceways, the ideal bottom slope for construction of ponds is
In linear flow-through fish raceways (used for rainbow trout and channel catfish), the floor is constructed with an intentional longitudinal bottom slope of $1\% - 2\%$ ($1-2\text{ m}$ fall per $100\text{ m}$ length).
This gradient generates a self-cleaning hydraulic flow velocity that transports settled solid feces toward the downstream waste collector without requiring mechanical scraping.
Correct Option: Option 2 (1-2%).
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Q.4
Aquaculture- ICAR JRF/SRF 2024 (Q.120)
MCQ (Single Correct)+4−1
Which one of the following limitation is associated with raceway aquaculture?
Continuous flow-through raceways divert large volumes of river or spring water through densely stocked fish tanks.
Because water velocity carries uneaten feeds and feces directly out into the stream before sedimentation occurs, raceways discharge high concentrations of phosphorus and nitrogen, causing localized downstream eutrophication.
Correct Option: Option 2 (High phosphorous).
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