{"id":14823,"date":"2025-06-15T22:00:00","date_gmt":"2025-06-15T22:00:00","guid":{"rendered":"https:\/\/modernsciences.org\/staging\/4414\/?p=14823"},"modified":"2025-06-05T17:05:37","modified_gmt":"2025-06-05T17:05:37","slug":"california-fish-parasites-human-risk-june-2025","status":"publish","type":"post","link":"https:\/\/modernsciences.org\/staging\/4414\/california-fish-parasites-human-risk-june-2025\/","title":{"rendered":"Study Finds Common California Fish Carry Parasites That Can Infect Humans"},"content":{"rendered":"\n<div class=\"wp-block-group has-gray-200-background-color has-background\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<h1 id=\"at-a-glance\" class=\"wp-block-heading\">At a Glance<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">A study from UC San Diego found that most freshwater fish in Southern California are infected with parasitic flatworms that can cause serious health issues if consumed raw or undercooked.<\/li>\n\n\n\n<li class=\"\">These parasites originate from invasive snails and are transmitted to humans through fish, posing an unrecognized risk to those who regularly eat freshwater catches.<\/li>\n\n\n\n<li class=\"\">Researchers discovered that up to 93 percent of sampled fish carried <em>Haplorchis pumilio<\/em>, with some fish harboring thousands of individual parasites.<\/li>\n\n\n\n<li class=\"\">Many popular YouTube videos on raw fish preparation failed to mention the importance of proper cooking or freezing, potentially increasing public exposure to these harmful parasites.<\/li>\n\n\n\n<li class=\"\">Although thorough cooking or freezing can kill the parasites, repeated exposure may lead to long-term health consequences, prompting a call for increased awareness and safer food practices.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">A new study from researchers at <a href=\"https:\/\/ucsd.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">UC San Diego<\/a>\u2019s <a href=\"https:\/\/scripps.ucsd.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">Scripps Institution of Oceanography<\/a> has revealed a surprising health risk from eating freshwater fish in Southern California. The study, published in the <a href=\"https:\/\/academic.oup.com\/jid\/advance-article\/doi\/10.1093\/infdis\/jiaf180\/8154770\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Journal of Infectious Diseases<\/em><\/a>, discovered that the most popular freshwater fish in the region carry parasitic flatworms called trematodes. These parasites, which are transmitted through fish, can cause gastrointestinal issues, weight loss, and, in rare cases, heart attacks or strokes in humans.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The parasites, <em>Haplorchis pumilio<\/em> and <em>Centrocestus formosanus<\/em>, are carried by an invasive snail species, <em>Melanoides tuberculata<\/em>, which has spread across 17 U.S. states and Puerto Rico. The trematodes&#8217; life cycle begins with the snails, which infect fish. Then, humans or other animals can become infected by eating the contaminated fish. This discovery is a wake-up call for people who consume freshwater fish, particularly those who eat them raw or undercooked.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img  decoding=\"async\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"\"  class=\" pk-lazyload\"  data-pk-sizes=\"auto\"  data-pk-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/2025\/freshwater-fish-in-us.jpg\" ><figcaption class=\"wp-element-caption\">A bluegill fish collected during the study was found to contain an astounding 16,973 <em>Haplorchis pumilio<\/em> and 8 <em>Centrocestus formosanus<\/em> infectious trematode parasite larval stages. This finding highlights a newly identified health risk associated with consuming freshwater fish in Southern California, as these parasites can cause various health issues in humans if the fish are eaten raw or undercooked. (Palmer et al., 2025)<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The team found that nearly 93% of fish from seven species caught in San Diego County were infected with the <em>H. pumilio<\/em> parasite, with some individual fish hosting thousands of parasites. The second parasite, <em>C. formosanus<\/em>, was found in 91% of the fish at certain fishing spots. The researchers also discovered that many YouTube videos featuring raw fish preparation did not mention the importance of cooking or freezing the fish to avoid the parasites, potentially increasing the risk of infection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The good news is that cooking or freezing the fish kills the parasites, reducing the chances of infection. However, repeated exposure to these parasites could lead to more severe health issues. The researchers hope their findings will raise awareness among the public, medical professionals, and public health officials, urging better fish preparation practices to protect against this under-recognized health risk.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"references\" class=\"wp-block-heading\">References<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Palmer, E. M., Metz, D. C. G., &amp; Hechinger, R. F. (2025). Further evidence for plausible transmission of fishborne trematodiases in the united states: Game fish carry human-infectious trematodes and are eaten raw. <em>The Journal of Infectious Diseases<\/em>, jiaf180. <a href=\"https:\/\/doi.org\/10.1093\/infdis\/jiaf180\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1093\/infdis\/jiaf180<\/a><\/li>\n\n\n\n<li class=\"\">University of California-San Diego. (2025, June 3). <em>Most freshwater game fish in Southern California carry invasive parasites capable of infecting humans, study finds<\/em>. Phys.Org; University of California-San Diego. <a href=\"https:\/\/phys.org\/news\/2025-06-freshwater-game-fish-southern-california.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/phys.org\/news\/2025-06-freshwater-game-fish-southern-california.html<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"A study finds that nearly all common freshwater fish in Southern California carry parasitic worms that can infect humans, especially if the fish are eaten raw or undercooked.\n","protected":false},"author":4,"featured_media":14825,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","fifu_image_url":"https:\/\/images.unsplash.com\/photo-1667597418325-68423017260a?q=80&w=1974&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D","fifu_image_alt":"","footnotes":""},"categories":[11],"tags":[11849,11848,11850,11852,11854,11857,11859,11846,11845,11860,11853,11861,11863,11844,11858,11856,11851,11855,11862,11847],"class_list":["post-14823","post","type-post","status-publish","format-standard","has-post-thumbnail","category-nature","tag-california-freshwater-fish-parasites","tag-centrocestus-formosanus-risk","tag-cooking-fish-kills-parasites","tag-fish-borne-parasite-health-risk","tag-fish-borne-trematodes-in-california","tag-flatworm-parasites-in-us-fish","tag-freezing-fish-prevents-infection","tag-freshwater-fish-parasite-transmission","tag-haplorchis-pumilio-in-fish","tag-invasive-snails-spread-disease","tag-journal-of-infectious-diseases-fish-study","tag-melanoides-tuberculata-snails","tag-parasite-awareness-in-seafood-safety","tag-parasite-infected-fish-san-diego","tag-public-health-risk-from-raw-fish","tag-raw-fish-parasite-danger","tag-scripps-institution-fish-parasite-study","tag-trematode-infection-from-fish","tag-undercooked-fish-parasite-infection","tag-zoonotic-fish-parasites-california","cs-entry","cs-video-wrap"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- 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