Invasive Parasites Infecting California Fish: Public Health Risk

Invasive Parasites Found in San Diego County Fish: Public Health Officials Urge Awareness A recent study conducted in San Diego County, California, has revealed a concerningly high rate of parasitic trematode infection in local freshwater game fish. Researchers found that 93% of the fish examined were infected with Haplorchis pumilio, with some harboring thousands of parasites. A second parasite, Centrocestus formosanus, was found in 91% of fish in two of the five locations sampled. "These parasites are here in the U.S., and they're infecting fish that people are eating," said Ryan Hechinger, one of the study's authors. The parasites, originating in Southeast Asia, arrived in the U.S. with their host, the red-rimmed melania snail. The study highlights the risk to humans who consume raw or undercooked freshwater fish. While a single infection is unlikely to cause serious harm, chronic, repeated infection poses a greater risk. The researchers recommend that fish-borne trematode infection be added to the list of reportable diseases to allow for more accurate tracking. The study's authors plan to share their findings with public health officials in Southern California to increase awareness and encourage better practices. This underscores the importance of public education regarding safe food handling practices, particularly for those who regularly consume freshwater fish.