If most bodies of water are filthy with poor visibility under just a few feet, how are fish and sealife able to see where they are going and what they are doing?

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I don’t mean very deep sea life which have lights and stuff, I just mean regular sea life that swims about in filthy water.

In: Biology

Fish can detect movement with their lateral line. Also Fish dont have human eyes, they evolved to see whats important and in different conditions.

Just because we perceive a need to ‘see’ things as very important, doesn’t mean other animals do also.

The simple answer is, they don’t need to ‘see’, and have other means of perception; echolocation, sensitive whiskers that detect vibrations in the water, good sense of smell, etc.