Get 2 Nightmare Cichlid Bones and 2 Vallorian Discus Bones, either by buying them from the Bazaar or by fishing and preparing them. Then hand them *unstacked* to Ramos Jerwan (a barbarian near the pool in Plane of Knowledge at location -30, +1430) so all 4 slots of the trade window are filled. In return he hands you the Fisherman's Companion.
I'm not sure where on EQ Traders you found that. It's a big site and I'm sure someone has said that at some point though.
The trouble is, categoricals are usually wrong. From what I can tell, mods to the lockpick skill stack at least in some contexts. A rogue can wield mechanized lockpicks, hold a second set on the cursor and open doors which normally would not be budge with just one set.
I recommending checking skill by skill. I tested with a Collapsible Fishing Pole and some Circular Fly based on Pixie wings. I could check my effective fishing skill by opening a tackle box in the new UI. It showed the effect of each mod separately to be visible and large enough it wouldn't be lost with rounding. (You can't see the effect of either one with a skill under 20.) The two together gave exactly the same effect as the higher item.
My assessment based on personal experience agrees with the previous assertion: Fishing modifiers do not stack.
You haven't walked straight in days? Dear...<lowers her voice to a hush> the fishing pole is supposed to be used for fishing, and getting drunk. What were you doing with it?!?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mistress Kahrina Belle Epic'd 61 Enchantress Lanys T'Vyl Server