white worm parasite?

backwoods

Small Fish
Sep 15, 2004
22
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Omaha, NE
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#1
Black neon tetra has had a bulge on its right-side behind its eye which was slowly swelling in size for about 6 months, but today that raised tissue had a worm like parasite (.4 cm) crawling out. I observed the worm for a minute and then decided to quarantine the fish. By the time I got a net, the worm was gone and the affected tissue less raised. I assume the worm broke free and was eaten by another fish. The tetra is in quarantine and doing well considering it was hosting a parasite for months.

Any ideas on what this creature was?

I added a second heater yesterday to help maintain 80 degrees during the fall/winter months. This may of triggered the parasites activity.