They had been living and working aboard the ISS since August and were expected to stay until February. The crew returned on January 15, which was a decision made by NASA's chief health and medical officer. Once the crew had landed, administrator Jared Isaacman said it was a "serious situation" but didn't go into any detail.
Other campaign groups, like the Wildlife Trusts, insist that many more fish are at risk. They highlight research from Natural England that found that over seven million fish would die if no measures whatsoever were put in place.
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