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From garden ponds filled with Koi Carp to the humble goldfish bowl – the UK is a nation of fish lovers.
The Pet Food Manufacturers’ Association (PFMA) say there are an incredible five million indoor fish tanks in Britain.
Around 10 per cent of British households own pet fish – making them the third most popular animal to welcome into our homes after cats and dogs.
There’s plenty of choice when it comes to adding fish to (well prepared and correctly set up) home aquariums, with pet shops offering a bewildering range of colourful and interesting finned friends.
But you should be aware that while some fish are placid and happy to live in a ‘community tank’ with a mixture of other species, others are predators that really need their own tank or, at the minimum, carefully-selected tank-mates.
Here are 10 of the most aggressive.
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9. Oscar Fish
Another species of aggressive cichlid, the Oscar Fish is a natural born bully that will happily eat small fish by the shoalful. If you are going to keep other fish with them they need to be of a similar size and of an equally aggressive nature. | Canva/Getty Images
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10. Betta fish
Like humans, the majority of aggression in beautiful Betta Fish is confined to the males - giving them their alternative name of Siamese Fighting Fish. Males can become aggressive even if they are able to see a competing Betta Fish in another tank. | Canva/Getty Images