A major oil spill in Poole Harbour, caused by a pipeline leak operated by gas company Perenco, has sparked serious concerns from the Game & Wildlife Conservation Trust (GWCT) over the impact on migratory fish. This incident occurs at a critical time for young Atlantic salmon and sea trout, which are currently migrating from the Rivers Frome and Piddle into the harbor. The GWCT highlights the potential harmful effects of oil on these species, including reduced growth, organ damage, and reproduction issues. The River Frome and Poole Harbour are crucial for these migratory fish, being designated as Site of Special Scientific Interest, Special Protection Area for Birds, and Ramsar site. The Rivers Frome and Piddle, which are home to other endangered migratory species like the European Eel and Sea lamprey, are part of the International Council for the Exploration of the Seas' network of Index Rivers to report the condition of wild salmon populations.