The fastest fish in the ocean and in the sea is the black marlin (Istiompax indica). This fish reaching speeds up to 130 km/h (80 mph).
Source: https://dinoanimals.com/animals/the-fastest-animals-in-the-world-top-100/
Black marlin lives in tropical and subtropical Indo-Pacific and east Pacific oceans from near the surface to depths of 900 m ((3,000 ft).
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Wow! Fish faster than cheetah!