Question:

Which is the most common bacterial disease in freshwater aquaculture?

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Columnaris → bacterial → common in warm water fish.
  • Columnaris
  • Argulosis
  • Ichthyophthiriasis
  • Dactylogyrosis
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The Correct Option is A

Solution and Explanation

Step 1: Columnaris is caused by Flavobacterium columnare.
Step 2: It affects gills, fins, skin — causes lesions, ulcers.
Step 3: Argulosis is parasitic (Argulus), Ichthyophthiriasis = white spot (protozoan), Dactylogyrus is monogenean parasite.
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