Acute Hepatopancreatic Necrosis Disease (AHPND) (or Early Mortality Syndrome, EMS): Caused by virulent strains of Vibrio parahaemolyticus harboring the pVA1 plasmid encoding the insecticidal binary toxins PirA and PirB.
The toxins induce pathognomonic massive sloughing and desquamation of hepatopancreatic tubule epithelial cells, resulting in severe atrophy, pale discoloration, and shrinkage of the hepatopancreas.
Correct Option: Option 4 (AHPND).
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27
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Which one of the following is harmful for the carp spawns?
Newly hatched carp spawn ($5-7\text{ mm}$) possess poor swimming mobility and thin cuticles, making them highly vulnerable to aquatic hemipteran and coleopteran insect predators.
Anisops spp. (Backswimmers, family Notonectidae): Voracious aquatic predatory bugs that grasp carp spawn with their raptorial forelegs and inject piercing-sucking digestive enzymes, killing hundreds of carp larvae within hours.
Brachionus, Keratella, and Ceriodaphnia are beneficial non-predatory zooplankton that serve as primary food.
Correct Option: Option 1 (Anisops).
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28
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
The WOAH-lsted pathogenic agent Gyrodactylus salaris is a cold-water-adapted —-—-——--
Gyrodactylus salaris: A highly destructive, WOAH-listed coldwater monogenean ectoparasite of Atlantic salmon (Salmo salar) skin, fins, and gills.
It is a viviparous ectoparasite exhibiting polyembryony (hyper-viviparity), where the pregnant parent parasite bears an advanced embryo inside her uterus that already carries within itself a developing second-generation embryo ("Russian doll" reproduction), permitting explosive exponential reproduction without laying free eggs.
Trypanosoma spp. (e.g., Trypanosoma danilewskyi, T. carassii): Extracellular kinetoplastid flagellated protozoan parasites inhabiting the peripheral blood vascular system of freshwater and marine fishes.
Transmitted biologically by rhynchobdellid aquatic leeches (Piscicola spp.), causing anemia and lethargy.
Correct Option: Option 1 (Trypanosoma spp).
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30
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Myxosporidean parasites of fish have an obligatory —---------------- host for the completion of their life cycle
Myxosporean parasites of fishes (phylum Cnidaria, subphylum Myxozoa, e.g., Myxobolus cerebralis, Thelohanellus) possess a mandatory two-host heteroxenous life cycle:
Fish Host: Hosts the vegetative sporogonic phase producing multicellular myxospores.
Annelid Invertebrate Host: Primarily benthic freshwater oligochaetes (such as Tubifex tubifex), wherein the parasite transforms into the tri-radiate actinospore stage that infects fish.
Correct Option: Option 1 (Oligochaete).
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