I am not completely sure what you are asking. I will give it a shot though.
Under rules Fii it says if you enter a space with a polar bear you have the option to 'stop on this space' to send the polar bear off in another direction. However, later on there is a comment that states, 'you can never finish your turn on a space with a polar bear'.
Right. You can use the fish to move through the polar beer or you can stop and send him away. Your choice.
Is this just for the purposes of escaping a bear that has been bounced to you?
I guess it's the case that when you initially stop on a space with a polar bear you technically haven't finished your turn as you still have to move the polar bear. Could you then keep moving yourself?
I don't think so.
Also just to confirm you would need 2 fish for the purposes of moving bears (not ones that have been moved to you but ones you encounter by moving your explorer to in your own turn). 1 to distract then another to move it. Is that correct?
It is 1 fish per bear. If you stop the bear leaves, if you keep going the bear stays put.
Yet another question is about moving way from a bear that ends up on your ice floe.
I'm confused. You need to immediately move away (1 fish, 1 rope or no resources) but only after you've moved away can you bounce a polar bear?
I think you get to stay put if you bounce the polar bear.
The wording, 'you may also use a fish to bounce a bear' suggests this is in addition to moving away not instead of. Basically, if a bear ends up on your ice floe can you bounce it without having to run away thus requiring the need of only 1 fish in total?
I think also is "instead of" in this case. That is more or less how I have been playing it.