If a fish in a fast moving rocky stream lost the ability to use its fins to swim quickly it would?

If a fish in a fast-moving rocky stream lost the ability to use its fins to swim quickly, it would struggle to maintain its position and avoid being swept downstream by the current. This could lead to increased vulnerability to predators and difficulty finding food, ultimately threatening its survival. Over time, the fish might seek refuge in calmer waters or adapt its behavior to maximize its remaining abilities, but its chances of thriving in a fast-flowing environment would be significantly diminished.