A McDonald’s customer said they found a parasite in a Filet-O-Fish sandwich. Reddit users explained why that can happen in wild-caught fish.

A gross surprise may lurk in your Filet-O-Fish sandwich. But it's normal, and a good sign it's a healthy fish. Here's what to know.

People can be particularly picky when it comes to fish, but even restaurant workers don't want to eat one type. Find out ...

Using genome reconstruction, scientists unveiled a once 'invisible' fish parasite present in many marine fish world-wide that belongs to the apicomplexans, one of the most important groups of ...

Regularly we get questions about fish parasites. Last year a new parasite was discovered in the northeastern portion of Wisconsin in 10 lakes. Heterosporis, a microsposporidan parasite. The DNR is not ...

A UC San Diego study published Tuesday found that more than 90% of freshwater game fish in Southern California had parasites capable of infecting humans and causing health problems. The parasites are ...

Cichlid fishes, renowned for their extraordinary speciation and adaptive radiation, provide an exceptional framework to explore evolutionary dynamics, particularly through the study of their parasites ...

They thrive everywhere from bustling cities to remote rainforests—even in our own backyards. Pervasive and unapologetic mooches, parasites rely on other organisms for their survival. How parasites ...

Parasites that eat fish tongues and take their place in the mouth have been found in a batch of seabream arriving at a port in the U.K. The parasites, Cymothoa exigua, were first spotted in the ...