Catadromous: Fishes that spend the adult feeding and somatic growth phase of their lives in freshwater and migrate downstream to the sea to spawn and breed (e.g., freshwater eels, Anguilla bengalensis, Anguilla rostrata).
Anadromous: Fishes that spend most of their life growing in the marine environment and migrate up into freshwater rivers to reproduce (e.g., Hilsa Tenualosa ilisha, Atlantic salmon Salmo salar).
Amphidromous: Fishes that migrate between fresh and salt water for reasons other than reproduction (e.g., juvenile feeding).
Potamodromous: Fishes whose migrations occur entirely within freshwater river systems.
Correct Option: Option 2 (Catadromous fish).
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7
ICAR JRF Aquatic Environmental Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
What distinguishes Euryhaline organisms from stenohaline organisms?
Euryhaline Organisms: Aquatic organisms possessing robust physiological and cellular osmoregulatory adaptations that enable them to tolerate a wide range of ambient salinities (e.g., Milkfish Chanos chanos, Barramundi Lates calcarifer, Tilapia Oreochromis mossambicus, Mullet Mugil cephalus).
Stenohaline Organisms: Organisms that can survive only within a narrow, restricted salinity range, lacking the osmoregulatory flexibility to withstand salinity shifts (e.g., pure freshwater carps or stenohaline reef corals).
Correct Option: Option 3 (Euryhaline organisms can adapt to a wide range of salinities, while stenohaline organisms can only tolerate narrow ranges).
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8
ICAR JRF Aquatic Environmental Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
The concentration of iodine solution required in smoked fish plant for hand and equipment sterlization respectively are
Iodophors are complexes of elemental iodine bound to non-ionic surfactants, providing broad-spectrum bactericidal, fungicidal, and virucidal activity.
Prescribed Concentrations:
Hand Dips / Hand Washing: $12.5 - 15\text{ ppm}$ available titratable iodine (safe for frequent skin contact without causing dermatitis).
Equipment and Utensil Sanitation: $25\text{ ppm}$ available iodine (effective sanitizer on cleaned stainless steel and food contact surfaces without requiring a subsequent potable water rinse).
Correct Option: Option 3 (15 and 25 ppm).
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9
ICAR JRF Aquatic Environmental Management 29 Jun 2024Shift 1
Nobashi Ebi (Stretched / Elongated Shrimp): A traditional Japanese-style value-added frozen shrimp product prepared from peeled, tail-on (PTO) marine or vannamei shrimp.
Small diagonal incisions (typically 4–5 cuts) are made along the ventral muscle grooves, and the shrimp is gently pressed and stretched straight manually.
This prevents muscle contraction and curling during cooking, making it ideal for breaded/battered shrimp and Tempura preparation.
Correct Option: Option 1 (Nobashi).
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10
ICAR JRF Aquatic Environmental Management 29 Jun 2024Shift 1
Japanese Surimi-Based Paste Products (Kamaboko Varieties):
Satsuma-age (Age-kamaboko): A deep-fried surimi-based fish cake product popular in Kagoshima (Satsuma province), Japan, characterized by a golden-brown fried crust and elastic interior.
Chikuwa: Bamboo-shaped surimi product grilled / broiled on rotating metal or bamboo skewers.
Hampen: Fluffy, marshmallow-like boiled fish cake prepared by whipping surimi with grated yam and egg white.
Tempura: Lightly battered, deep-fried seafood and vegetables.
Correct Option: Option 4 (Satsumaage).
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