Question

Dactylogyrus infection is found in
(A) Snakes
(B) Honeybee
(C) Fishes
(D) Lac insect
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only
• B. (A) only
• C. (A), (B), (C) and (D)
• D. (C) only

Hint:

Remember that "Dactylogyrus" (gill fluke) and "Gyrodactylus" (skin fluke) are two major monogenean parasites that pose serious disease risks in aquaculture and fish farms.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Dactylogyrus is a genus of monogenean flatworms (ectoparasitic trematodes) commonly known as gill flukes.
They possess a specialized posterior attachment organ called a haptor, which is equipped with anchors and hooks to attach to host tissues.

Step 2: Detailed Explanation:
Dactylogyrus species are host-specific parasites that target freshwater fish, particularly those in the family Cyprinidae (such as carp and gold fish).
The parasite attaches directly to the delicate gill filaments of the fish.
Once attached, they feed on the epithelial cells and blood of the host.
Heavy infections cause severe gill damage, respiratory distress, and secondary bacterial infections.
Affected fish often swim near the surface gasping for air or rub against pond edges to relieve irritation.
This parasite is not found on terrestrial organisms like snakes, honeybees, or lac insects.
Therefore, Dactylogyrus infections are found exclusively in fishes.

Step 3: Final Answer:
The hosts of Dactylogyrus are fish.
Thus, the correct option is 4 ((C) only).