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This is a paid asset, but now you can download Great White Shark Free.
Detail this asset from Unity Store: Original Link
Great White Shark v1.0
This model is a beautiful low poly model and has been designed to work well in video games and other interactive projects that may need a giant flesh eating fish.
The model comes with several animations with varying speeds to help achieve more natural looking swimming motions. With that said, most sharks are not constantly moving but rather use minor course corrective motions, so consider not constanlty looping animations.