If you bought an official copy of BG1 then you will also have a rather large map in the box, looking on that will show you in which areas are the places you're looking for. I spent hours going from place to place looking for the Splurging Sturgeon until my daughter pulled the map from the box. It's so easy to forget you have it.
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It's bleedin dark down here, slippery too.

Man, that's a pisser.