Step 1: Understanding coccidiosis.
Coccidiosis is a parasitic disease caused by protozoans of the genus {Eimeria}. Step 2: Evaluating the options. (A) sericulture: Incorrect. It relates to silkworm rearing. (B) poultry: Correct. Coccidiosis commonly affects poultry birds. (C) apiculture: Incorrect. It deals with honey bees. (D) fish hatchery: Incorrect. It relates to fish breeding. Step 3: Conclusion.
The correct answer is (B) poultry.