# Deep in This Lake, a Contagious Cancer Is Spreading

> **Newsylist Open Intelligence Dossier** · First detected: 2026-07-22 16:29 UTC · Category: Science · Sources: 11 · Current Velocity: 9.12

## Executive Summary
Researchers have identified a rare form of transmissible skin cancer affecting freshwater fish across Canada and the U.S.

## Intelligence Brief
Scientists have discovered the first-ever instance of contagious cancer in fish. This transmissible skin cancer has been identified in fish residing in lakes across the United States and Canada, including Quebec.


Coverage from the New York Times, Gizmodo, CTV News, CBC, and Phys.org emphasizes that these cancer cells behave more like parasites than traditional tumors. The discovery is characterized as rare.


Future attention will likely focus on the spread of these cells within freshwater lake environments.

## Verified Facts & Key Claims
### Where has this contagious cancer been found?
It has been discovered in freshwater fish in lakes across the U.S. and Canada, specifically including Quebec.

### What type of cancer is affecting the fish?
The discovery involves a transmissible form of skin cancer.

### How do these cancer cells behave?
According to Phys.org, the cells act more like parasites than traditional tumors.

## Key People, Organizations & Locations
This Lake, Contagious Cancer Is Spreading, Transmissible, Scientists Discover the First-Ever Contagious Cancer, Canada and U.S, Quebec and U.S

## Multi-Source Evidence Table
| Source Outlet | Headline | Published (UTC) | Verification URL |
|---|---|---|---|
| AOL.com | Scientists Discover Contagious Cancer in Lake Memphremagog Catfish | 2026-07-24 13:47 | [Source Link](https://news.google.com/rss/articles/CBMijwFBVV95cUxQYUJaaVkydl9HNDJiU2puZnV5N2tJakl2bG9FS0hBbVlDdDdqc3pMOFliMUN1ZkNLYzVyTktCcUJmcll6OGNGbXduRHljOTdTbUxEOUNEeFpwcUZ4YUd5eVhwT3hZWjdQTWNoaGdJOXZRV3dWdk56MnhKUGFUbkwtdWhIZUVLUHlrRkd6cU96MA?oc=5) |
| Forbes | Scientists Discover The Fourth Transmissible Cancer Known To Science | 2026-07-23 19:13 | [Source Link](https://news.google.com/rss/articles/CBMiuwFBVV95cUxPUGRTVXZRZVI3eHdhbzZnQlV2SmVsb29yVUVRVjZwZXlCT3ppb2c2Q2RsY0t6ck5WVm1RR1oxSlQ4R18zYVNpZFpBbEVab2tMZWtpaURKYnJsMTIyWldlUzZKYXptVTd5R2FuNXZReU5famNuUVJJVVFNTklmdnlPeHdZSE5sNjFzUjRvVEd1Ul9GNXVBM2d6YVFXN0JXSnh1WEJpaTFaNjVMRjlQdUJMclk0MFlPSDB1Rk84?oc=5) |
| Nature | Brown bullhead catfish melanoma represents a novel transmissible cancer | 2026-07-22 17:33 | [Source Link](https://news.google.com/rss/articles/CBMiX0FVX3lxTE1tdEVfRldXODg0bHBaT1BWRFdmUVF1cG4wVGJyTDdwRnpId0ZhSU1iTmZrYldvVmIyMjJNYk5CQTcteHJjbDdTWFhMb3M4a2hRbldpdGQxMmRUSkN6bGdR?oc=5) |
| Vermont Public | Scientists confirm rare 'parasite-like' cancer in bullhead from Lake Memphremagog | 2026-07-22 17:33 | [Source Link](https://news.google.com/rss/articles/CBMirgFBVV95cUxPWlVrZU5HdkZaWUxvTVJ6LXRKZHRUaVA0eXZYVkZ6NF9YbXJpM1JLVkF2V0dkc0ZESFlhbGJpbElUQm9oTTljOVpJX1gyRmlmWS1SNjQxaUE3SnFZVy1vV1FCT2ZZOFFiQVIyYkN5QjFzdTB3bDlSNUtQSHlnRDY1X0Y4Ul9lbzdDMWl3Mlg5RnFEOTVmQWlKeFdyb09aVUZsWUtVQUdETVBNQ2RMeVE?oc=5) |
| University of Vermont | More Like Parasites Than Tumors: Vermont Scientists Discover Transmissible Cancer in Catfish | 2026-07-22 17:33 | [Source Link](https://news.google.com/rss/articles/CBMisAFBVV95cUxNTzF2ME0wZ0F4UDY2TUpkbGlpM3hXSThDOFBqcE1fLWd5UHAxc2sxVGdLSFl4ZjQ2V3VjR1EtLXVQRXpoZFZ0dEhNdXVYVHNoSkg3VnJMY2RXZ2JROHo3bkJ6b0lDZXVwS0dfRmpaMVhqLThMVmVrc1JpYVdPdExtQ0UxbkxmdERXaDJrX0xpd09uUWJIb0JHNW5PcjJNeW9NSGlab0FYM3pPWktVYXU1Uw?oc=5) |
| NYT > Science | Deep in This Lake, a Contagious Cancer Is Spreading | 2026-07-22 15:23 | [Source Link](https://www.nytimes.com/2026/07/22/science/contagious-cancer-catfish.html) |
| Gizmodo | Scientists Discover the First-Ever Contagious Cancer in Fish | 2026-07-22 15:11 | [Source Link](https://news.google.com/rss/articles/CBMilgFBVV95cUxPd291RkxHNWtZRmNsTTluNENVczlBM2xBY0llTzl5Wi1zQ3g0OVJMRmpJMXp4QVNjVFVySGcweld0T1hJb3VHSHFFb3NQZlBHUFZfMGhmY2FBTzNvRUNXd3JIODN3WGhIazZIdlRxQUZ2emxOQzNna1ZUT181N3NfVmcxTTFNUk1aMXRZSDJ2a2JSX1UzUGc?oc=5) |
| CTV News | Transmissible skin cancer discovered in freshwater fish in Canada and U.S. | 2026-07-22 15:11 | [Source Link](https://news.google.com/rss/articles/CBMixwFBVV95cUxQUlBVUkZFUElSNFBVbWtpM3JkLXowdTJRcXpmM2NGTGp0cUFxQkxvcmNsRWRaYnRhY080b0RIR1Aycks2TDBMY3Q3cEFjTzYteHlsdV9qeHU3YjFMeGNveGZ3Ymd2TktMTkVZdlJDVEpxR0VrbHA1b3VuMjhOVEdINDJuMVVqLVFKdlMybFA2YzZuTTJzYkxkblRaZFk5S01hMXpYYkRWRlc3NWpTa2ZBX2FMMzY0N0FOS1VFWGxuYkp5UF9QZmF3?oc=5) |
| Phys.org | Transmissible cancer cells discovered in fish act more like parasites than traditional tumors | 2026-07-22 15:11 | [Source Link](https://news.google.com/rss/articles/CBMiggFBVV95cUxQQ2R1RDB5N0xPWDlqaWdtRFo1dEN2d1lwNWxiWjRVVnRiTEE1Tk03OG9fMWU4bDVuazJjUUtQZmI2REJIZWI5LThVWEVFM0tIYkRhWUpYcGJQNUNQcVRDSzRVcXBLZFhKU0hLazNZcXYtNkg4MmlVSzJ6TkVTT0JBQjFn?oc=5) |
| CBC | 'Rare' contagious cancer found in fish from Quebec and U.S. lakes | 2026-07-22 15:11 | [Source Link](https://news.google.com/rss/articles/CBMidkFVX3lxTFBselI2SFpURmNmUFNjTUxlVFFKT09CTWtET1FYZUs2UW50Y1RoV1Nta3A5Q3ZUZnR2V2lRX3hzRFhUTHlkdVpLOHNCWVhiaEVXMzN0S3B2MkU2YUF0WHRQcHlFTTNKQVJWYkJ3c29DXzhjaVdRQlE?oc=5) |
| The New York Times | Deep in This Lake, a Contagious Cancer Is Spreading | 2026-07-22 15:11 | [Source Link](https://news.google.com/rss/articles/CBMifkFVX3lxTE1kMHRqSGRKYl9KQzJlYU9uWlhmWnJ4UWRfMXRfR1dMeFczdkZ2ZlBxVlkwTmNwSmNCcFppTC1UNDA3cF9WUG9oVXB3LXR4VXl2dEJYbWtuTG9QSGE4NmxWZ3JoQXg5bVViUFRMNEV6OHZBbGEwQnNYdkZ6UHNxZw?oc=5) |

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