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as in Thinking??

No - movement and vibration detection. If you haven't heard of it you probably won't guess it.

I tried to find an optional link for you, but the address would have contained the answer.

A clue - if you have ever filleted a round fish, you may have noticed it - it would be where you make your first cut.

will have another look - just seen an iguana and a cow on a golf course (BBC News) not something I would imagine you have encountered while playing

Fortunately not, though we do frequently see Roe Deer early in the morning.

Sorry ChrisE but keep coming back to thinking ie outside the box

The first word means "along the side" and could be applied to thinking, though not by the fish!

The first word IS that kind of thinking, emrach!

Spoiler -The link will not give the answer but the webpage will.
http://www.streamexplorers.org/fish-facts/trout-senses

Well found, AB

Thanks everyone for your patience - thats what I meant as in thinking should have explained myself better