A significant, previously unknown population of freshwater pearl mussel was found in the Ivalojoki watershed in Finnish Lapland. The cooperative Lumimuutos discovered it during restoration work in the Sámi homeland in summer 2025; authorities are withholding the exact location.

The invasive carpet sea squirt (filtsjöpung), known as “sea vomit,” is rapidly spreading across the seafloor in Kosterhavet National Park, smothering organisms beneath it. Authorities say budget cuts have hampered monitoring and control, but they are now examining ways to slow the outbreak.

The Metlakatla Indian Community, which has been at the forefront in the effort to control the invaders, has trapped more than 40,000 of them this year.

A rare Haliphron atlanticus (seven-arm octopus) was caught by shrimp fishers in western Skagerrak at about 200 m depth and sent to the Tjärnö Marine Laboratory for study.

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.