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Any small animal's metabolic rate is higher/faster than the larger/bigger ones. And breathing is positively correlated with metabolism. Thus small fish breath faster than large fish.

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15y ago
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11y ago

Because they have small hearts that beat hundreds even thousands of times per minute.

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14y ago

because they are younger and have a faster heartbeat!

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Q: Why do young animals breathe faster than oldre animals?
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