In aquaculture ponds, zeolite is applied to selectively trap and adsorb toxic unionized ammonia and ammonium ions ($\text{NH}_4^+$) and bind hazardous metabolic gases (such as hydrogen sulfide, $\text{H}_2\text{S}$), thereby purifying the pond water column and benthic sediment.
Correct Option: Option 3 (Zeolite).
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Q.27
Aquaculture- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
Application of Gypsum in a pond corrects the. of pond water
Gypsum (Calcium Sulfate Dihydrate, $\text{CaSO}_4 \cdot 2\text{H}_2\text{O}$): Dissociates to provide soluble calcium ions ($\text{Ca}^{2+}$) without releasing carbonate or bicarbonate anions.
In ponds with excessively high total alkalinity ($\gt 300-400\text{ mg/L}$) and elevated $\text{pH}$, calcium from gypsum precipitates excess carbonate as insoluble calcium carbonate:
Shrimps (Penaeus vannamei, Penaeus monodon) are slow, continuous bottom feeders that manipulate and nibble feed pellets slowly using their maxillipeds and mandibles.
To prevent rapid physical disintegration and nutrient leaching into the water, commercially formulated shrimp feeds must exhibit a minimum water stability of 2 hours (retaining $\ge 85\%$ of their physical dry mass intact).
Correct Option: Option 3 (2 hours).
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Triploid ($3n$) Fishes: Possess three homologous sets of chromosomes, produced experimentally by subjecting newly fertilized eggs to thermal (cold/heat) or hydrostatic pressure shock to block retention of the second polar body during meiosis II.
Because triploid chromosomes cannot pair properly during meiotic synapsis, homologous chromosomes segregate abnormally, arresting gametogenesis.
Consequently, triploid fishes are functionally and genetically sterile, channeling energy into somatic growth and preventing unintended genetic interbreeding with wild populations.
Correct Option: Option 1 (Triploid).
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Q.30
Aquaculture- ICAR JRF/SRF 2024
MCQ (Single Correct)+4−1
The number of fish seed for transportation in containers can be calculated using the following formula
N =(D-2)Xv/RxH
Where : Dis
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