Heart disease is not just a human killer. A new study suggests that it's probably behind the deaths of millions of farmed salmon.The study was carried out in the Faroe Islands, which has a better record on fish welfare than some of its neighbours.Nevertheless, more than three million die each year in the Faroes, many of them from cardiac-related issues, according to NordForsk, a Nordic Council of Ministers umbrella research organisation. Called Project DigiHeart, it involved researchers from three Nordic countries - the Faroes, Norway and Sweden.One of those at the centre of the research is a PhD student called Heidi Mortensen, who is currently working at the state-owned Fiskaaling, Aquaculture Research Station in the Faroes.She says: "There are farming facilities in almost every single fjord in the Faroe Islands, so it's a huge industry up here. We're concerned about how aquaculture is affecting our ecosystem.
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