In a large enough tank, goldfish can grow up to around 30cm in length – and this little guy had plenty of room. ▼ Arapaima can grow to over 4 metres (13 feet) long, so it’s perhaps no surprise that our little goldfish didn’t fancy ending up as dinner.
The goldfish’s environment over the last seven or so years appears to have been rather pleasant – the bottom of the large filtration tank was coated with sand, and the leftover food constantly washing through from the arapaima’s tank provided a perfectly balanced diet for the brave little fish. The tiny goldfish escaped through a 1cm diameter pipe into the filtration system, where it lived on scraps of leftover food pumped out of the main tank. The fish in the exhibition tank are flesh-eating arapaima, one of the largest freshwater fish in the world. According to aquarium director Tomoyuki Satonaka, the aquarium’s arapaima used to be fed live fish – but the practice was stopped seven years ago when the aquarium began feeding the fish more conventional solid fish food.
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