Actinospore Stage (e.g., Triactinomyxon): Released from infected aquatic oligochaetes into the water column. It is the infective stage for the fish host, discharging polar filaments to penetrate fish cutaneous epidermis and gill epithelia.
Correct Option: Option 4 (Actinospore).
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32
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Noncytochrome oxidase - containing Gram - negative bacteria pathogenic for fish
Bacterial fish pathogens belonging to the family Enterobacteriaceae are characteristically Gram-negative, facultatively anaerobic rods that are cytochrome oxidase-negative:
While most bacterial fish pathogens are aerobic or facultatively anaerobic:
Eubacterium tarentellae: A strictly anaerobic, Gram-positive, non-spore-forming rod-shaped bacterium implicated as a fish pathogen causing chronic neurological infections and brain cavitation in estuarine fishes (such as striped mullet, Mugil cephalus).
Tilapia Lake Virus (TiLV): An emerging segmented, negative-sense, single-stranded RNA virus (family Amnoonviridae) infecting cultured and wild tilapia (Oreochromis niloticus).
Syncytial Hepatitis of Tilapia (SHT): The pathognomonic histological lesion of TiLV infection, characterized by severe hepatocellular degeneration and the formation of large multinucleated hepatic syncytia in liver parenchyma.
Correct Option: Option 1 (TiLV-infected).
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35
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
What is the similarity among Spring viraemia of carp virus (SVCV), Viral haemorrhagic septicaemia virus (VHSV) and
Infectious hematopoietic necrosis virus (IHNV)?
All three serious OIE/WOAH-listed finfish viral pathogens are enveloped, bullet-shaped, negative-sense single-stranded RNA viruses belonging to the family Rhabdoviridae.
Correct Option: Option 2 (All belong to Rhabdoviridae).
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