Anglers caught dozens of humpback salmon in Eyjafjarðará river yesterday, RÚV reports. Humpack salmon are spreading in Iceland and threatening local fish species in Icelandic rivers.

In a recent report from the Icelandic Food and Veterinary Authority (MAST), 16 salmon caught in the Mjólká river in the Westfjords were confirmed to originate from farms. Signs indicate that the salmon originate from open sea farms by Haganes, where a hole in the pen caused part of the stock to escape in August.

The Icelandic Food and Veterinary Authority (MAST) has found evidence of infectious salmon anaemia (ISA) in an open-net salmon farm in Reyðarfjörður fjord, East Iceland. ISA is a highly infectious viral disease that has no treatment and causes high mortality in farmed Atlantic salmon.

A tear was discovered in one of Arctic Fish’s open-sea fish farms in Dýrafjörður in the Westfjords. A notice on the company’s website says the tear was discovered during routine inspection and is located at a depth of about 20 metres (65 feet).

It’s the first time that the virus has been detected in salmon in Iceland, though it was found in halibut in 1999. The virus poses no health risks to people.

Three farmed salmon have been caught in the Westfjords this season. Farmed salmon have a tendency to swim up rivers later in the season than wild salmon, meaning the true number of escapees may not be apparent until the end of the fishing season.

Fifty-three thousand salmon died while being transferred out of a damaged marine pen at a fish farming facility in the West Fjords.