Internal parasites
Camallanus: red worms at the vent
Camallanus is a nematode group. Visible reddish worms at the vent can be a clue requiring confirmation.
Do not pull
Photograph what is visible without handling or tugging at the tissue. Take the image and fish history to a fish-health professional.
Diagnosis and follow-up
Worm identification and life cycle affect the management plan. One disappearing worm does not establish that the system is clear.
Check companions
Record which fish are affected, where live foods came from and recent stock additions. Do not share equipment while the cause is investigated.
Sources & further reading
Original WakeyKoi wording, informed by the references below. Linked clinical resources explain the evidence and their scope; they have not reviewed or endorsed this website.
Related guides
Educational guidance cannot diagnose an individual fish. Breathing distress, severe injury or unexplained losses need prompt professional assessment.