A salmon farm manager in Finnmark urges fishermen to report pearl necklace siphonophore (jellyfish) sightings after blooms caused skin and eye injuries and breathing problems in farmed salmon near Øksfjord/Hammerfest.

A harmful plankton bloom and poor water conditions caused large mortalities at three Cermaq salmon farms in northern Clayoquot Sound near Tofino, with up to 185,000 fish lost at one site. DFO says disease was ruled out; critics warn the die-off could affect wild salmon and the marine environment.

Mowi Canada East reports 166,262 farmed salmon died at two sites near Chaleur Bay on Newfoundland’s south coast, blaming repeated sea lice infestations intensified by warm surface waters, low freshwater runoff, and calm winds. The incident follows earlier 2025 mass mortalities linked to a thermocline inversion and warm, low-oxygen conditions.

Icelandic authorities report that 7 of 22 salmon submitted for testing were confirmed as farmed escapees, caught in several North/West Iceland rivers. Tracing suggests six fish share a common origin in Dýrafjörður; investigations continue and anglers are asked to turn in suspect fish whole for analysis.

About 800 farmed salmon escaped from Cermaq’s Rypefjord facility near Hammerfest due to a dislodged transfer pipe, prompting concerns over genetic threats to wild salmon in Repparfjordelva and Altaelva and calls for stronger containment measures.

A small but potentially environmentally threatening crab is expanding its area of influence in Alaska.

The Kachemak Bay National Estuarine Research Reserve detected Pseudo-nitzschia at bloom levels in Kachemak Bay starting July 4. This diatom can produce the toxin domoic acid, associated with amnesic shellfish poisoning, though toxin production is not yet confirmed. Observed bird deaths and marine mammal strandings have spurred collection of mussel samples for lab testing.

Sea surface temperatures off Norway have reached 22–23 °C, at least five degrees above normal, marking a marine heatwave that risks stressing marine life and intensifying extreme weather.

Infectious salmon anemia (ILA) has been confirmed at a SalMar aquaculture facility in Trettevik, Senja municipality in Troms, triggering a 10–20 km restriction zone to prevent disease spread.

An algal bloom in Northern Norway dominated by Chrysochromulina and Phaeocystis has caused massive fish die-offs in recent weeks, with up to one million farmed fish reported dead around Astafjorden.