Across the world, over 3 billion people, or nearly half the global population, rely on fish as a significant source of animal protein, and since 2012, more of our fish has come from aquaculture or fish farms rather than catching wild fish. Dr Tarang Mehta is a molecular evolution scientist at the Earlham Institute who has been looking at future-proofing one group of fishes in particular, tilapia, which is already a hugely important fish for people around the world.