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Worms found in 96% of sushi-grade tuna tested in a lab — risking potential illness and a ruined meal

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Cost, B. (2026, September 3). Worms found in 96% of sushi-grade tuna tested in a lab — risking potential illness and a ruined meal. New York Post. https://nypost.com/2026/09/03/lifestyle/parasites-infest-nearly-every-single-tuna-in-one-haul-study/

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New York Post · collected 2026-09-03 · by Ben Cost

Quick Summary

Brazilian scientists found that 96% of sushi-grade tuna tested in a lab was contaminated with worms, with a total of 1,600 worms detected. The study, published in the journal Ocean and Coastal Research, analyzed 53 skipjack tuna caught locally in Brazil using powerful microscopes. The majority of the worms were concentrated in the intestines, muscle tissue, and stomach, which are often consumed by humans. Experts warn that eating raw or undercooked fish tainted with these parasites can cause gastrointestinal symptoms such as nausea, vomiting, and diarrhea.
Written by AI on 2026-09-03, from this article's own text only (the story summary below draws on all the coverage).

AI analysis

Story summary

Brazilian researchers from the Federal University of Santa Catarina analyzed 53 locally-caught skipjack tuna and found that 96% of them were contaminated with worms, a total of 1,600 parasites. The worms were most commonly found in the fish's intestines, followed by its muscle tissue, which is typically consumed. Only the kidneys and hearts remained free of parasites. This high rate of contamination has sparked concerns about food safety and highlights the importance of proper sanitary inspection, according to the researchers.

Written for “Parasites in Tuna Samples” on 2026-10-30, grounded in this article and the 0 other(s) covering the same event.

Story

📰 Parasites in Tuna Samples
Health · 1 article(s) covering the same event.

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How this article was measured signals, leaning charts, publisher record, byline, topics and claims

Signals How these are calculated →

Claims extracted
18
sentences that state something as happening or true
Uncertain
11%
2 of 18 hedged ("reportedly", "may", "according to")
Leaning
Leans left
of the writing, not the subject · beta estimate
Publisher signals
66/100
New York Post's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
1
Health
Same framing elsewhere
1
articles that frame the event the way this one does
Analyzed 2026-09-03 · how these are computed

How this is being covered How these are calculated →

Article leaning vs. publisher reliability
Source leaning vs. consistency

Publisher

New York Post · 15208 article(s) · 35 correction(s) detected
Running correction rate · 35 correction(s)

Who wrote this

Ben Cost
36 article(s) here · 1 carrying a prediction
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Also by Ben Cost
Nothing else under this byline is closely related to this article, so these are simply their most recent.
All 36 articles by Ben Cost →

Topics

Brazil Brazilian Ocean and Coastal Research Science Alert the Federal University of Santa Catarina

Subjects

Brazil GPE · 1× Brazilian NORP · 1× Chelsea Wood PERSON · 1× Ocean and Coastal Research ORG · 1× Science Alert ORG · 1× University of Washington ORG · 1× the Federal University of Santa Catarina ORG · 1× the University of Washington ORG · 1×

Narrative

The lion’s share of these squiggly interlopers were concentrated in the intestines followed by the muscle tissue – the portion we eat – and then the stomach while only the kidneys and hearts were untainted.
framing: assertive · carried by 1 article(s) · first seen 2026-09-03
🔮 Brazilian scientists found that nearly all the tuna fish in a recent haul were contaminated by worms, sparking fears that our sashimi could be a parasite playground. “These results highlight the importance of sanitary inspection,” warned the researchers in the a-raw-calyptic study published in the journal Ocean and Coastal Research.

Claims (18 extracted, 2 hedged)

What’s worse than finding a worm in your apple? asserted
What → ’ → apple
Brazilian scientists found that nearly all the tuna fish in a recent haul were contaminated by worms, sparking fears that our sashimi could be a parasite playground. “These results highlight the importance of sanitary inspection,” warned the researchers in the a-raw-calyptic study published in the journal Ocean and Coastal Research. uncertain
researchers → find → journal
The scientists, who hailed from the Federal University of Santa Catarina in southern Brazil, reportedly analyzed 53 locally-caught skipjack tuna — a popular commercial species — using powerful microscopes. uncertain
who → hail → microscopes
They finding that a whopping 96 percent of the catch harbored parasites, amounting to 1,600 worms in total, Science Alert reported. asserted
Alert → find → total
The lion’s share of these squiggly interlopers were concentrated in the intestines followed by the muscle tissue – the portion we eat – and then the stomach while only the kidneys and hearts were untainted. asserted
kidneys → concentrate → tissue
While scientists weren’t surprised to find worms in fish — parasites have been infesting them since time immemorial — they were shocked at the sheer numbers and how widespread they were in the organs. asserted
they → find → organs
This is particularly disconcerting given skipjacks’ global popularity with 3.1 million tons of this prized eating fish caught and sold around the world in 2022. asserted
This → give → 2022
Scientists said this highlighted the importance of immediately removing the viscera to prevent parasites from migrating from the organs to the meat. asserted
this → say → meat
Unfortunately, despite meticulous examination by seafood processors and sushi chefs, these sashimi stowaways inevitably wriggle under the radar. asserted
stowaways → wriggle → radar
Unfortunately, finding these parasite piñatas is becoming more and more common. asserted
finding → find → piñatas
In 2020, University of Washington researchers found that there’s been a 283-fold spike in the amount of herring worms — which parasitize a variety of fish and squid — in raw fish between 1967 and 2017. asserted
which → find → 1967
In other words, we’ve gone from finding one worm per every 100 fish caught to one in every single one. asserted
we → go → one
Eating raw or undercooked fish tainted with these interlopers can cause wreak gastrointestinal havoc, causing symptoms including nausea, vomiting and diarrhea. asserted
Eating → eat → nausea
Fortunately, these effects subside when the fish-hiking parasites die in a few days. asserted
parasites → subside → days
Experts recommend thoroughly cooking fish to reduce the likelihood of contracting these intestinal infiltrators. asserted
Experts → recommend → infiltrators
Despite the illness risks, some experts believe that many parasites are an indicator of freshness, similar to how insect-ridden produce is said to signify organic provenance. asserted
produce → believe → provenance
“Everyone assumes that worms in your salmon is a sign that things have gone awry,” said Chelsea Wood, a parasitologist at the University of Washington. asserted
Wood → assume → Washington
“I see their presence as a signal that the fish on your plate came from a healthy ecosystem.” asserted
fish → see → ecosystem
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