Video

9 of the Deadliest Fish in the World

By Hannah Ward

Published September 20, 2025 Runtime 1:44

With over 35,000 fish species worldwide, it’s no shock that some are downright deadly. While sharks are the obvious suspects, many of the most dangerous fish are surprisingly small. Some carry enough venom to kill a person in under an hour, and a few have no known antidote. Here are nine of the deadliest fish on the planet, from tiny killers to massive predators.

About the Author

Hannah Ward

Hannah is a writer at A-Z animals where her primary focus is on reptiles, marine life, mammals, and geography. Hannah has been writing and researching animals for four years alongside running her family farm. A resident of the UK, Hannah loves riding horses and creating short stories.

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