Four years ago, Scottish geologist Iain Stewart made his first ever visit to Kerala along with a BBC crew in search of karimeen, the backwater fish that’s also a favourite among foodies. But this was no culinary expedition. The crew were filming the Rise of the Continents, a mega documentary series on the split-ups and reunions of Earth’s gigantic landmasses, and karimeen was central to their story. As it turns out, there is only one other fish in the entire world that shares its anatomy with our karimeen - the paratilapia cichlids. And they live over 4,000 kilometres away in the freshwaters of the island country of Madagascar, in the middle of the Indian Ocean.

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