How many fish does it take to build a bridge?
If you get a road building development/progress card how does that apply to bridges?
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http://www.catan.com/service/combinations/fishermen-catan-rivers-catan says "If you pay 6 fish, you can build a bridge".
Meanwhile, the rules for the Rivers of Catan scenario specifically state that you cannot use the "Road Building" development card to build a bridge, and that would seem to extend to any combination of expansions/scenarios that replaces the normal development cards (including the Traders & Barbarians scenario, or the Cities & Knights progress cards).