Ultimately, we stop growing because we are genetically programmed to do so. Our DNA controls our growth, and humans are simply programmed to stop growing at a certain age, when we are fully developed for reproduction. There is not much reason to keep growing since a larger body would require a larger caloric intake, which means more food to find.
Fish grow throughout their life because their DNA instructs them to do so. Their growth slows with age though, probably because growth is a big draw on energy that might be used for something else, like reproduction.
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