Is There a Halachic Issue with Parasites in Fish?

Years ago, a concern was raised regarding whitefish from Winnipeg that were found to be
infested with parasites. At that time, poskim ruled that this was not an issue. Recently, the question of parasites in fish has resurfaced and has become a topic of much controversy and discussion. The OU position remains that parasites found in the flesh of fish are not a Halachic concern.