The channel catfish (Ictalurus punctatus) is native to North America and represents the largest and most valuable aquaculture industry in the United States of America (USA).
Commercial farming is heavily concentrated in the Mississippi Delta region (Mississippi, Alabama, Arkansas, and Louisiana) using levee ponds, intensive split-pond systems, and raceways.
Correct Option: Option 2 (USA).
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2
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
Genus Brachionus (e.g., Brachionus plicatilis, Brachionus rotundiformis) comprises microscopic aquatic animals belonging to the phylum Rotifera (wheel animals).
Rotifers possess a characteristic anterior ciliated corona (wheel organ) and a specialized muscular pharynx (mastax). They are the premier live food organism utilized for first-feeding finfish and shellfish larvae in aquaculture hatcheries.
Correct Option: Option 1 (Rotifera).
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3
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
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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4
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
The colloidal fraction of pond bottom soil (consisting of clay colloids and organic matter / humus) governs overall aquatic biological productivity.
Colloidal particles possess immense specific surface area and negative surface charges, conferring high Cation Exchange Capacity (CEC).
They adsorb, store, and dynamically release critical macro-nutrients (phosphate, ammonium, potassium, calcium) into the water column, preventing nutrient loss and stabilizing aquatic fertility.
Correct Option: Option 2 (Colloidal content of the soil).
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5
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
One of the highly indispensable live foods used in the shrimp aquaculture industry
Brine Shrimp (Artemia salina / Artemia franciscana): The newly hatched free-swimming Artemia nauplii represent the most universal and indispensable live food used across commercial shrimp hatcheries.
From the mysis stage through early post-larval development (PL1 to PL10), Artemia nauplii provide the optimal prey size, slow motility, high protein content, and essential lipids required for larval survival.
Correct Option: Option 1 (Brine shrimp).
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