Glad you're using the site! :D
I think I'll go ahead and throw out a temporary fix for this problem right now, it might be a little while before we can actually fix the root problem...
(The problem is, the "Recommended Level" on fish is overriding the fish's item level when it comes to putting fish into the right 'Categories' for this site. Every fish that has a Recommended Level of 50 to 60, gets put into the 50-99 category incorrectly. Trying to track down the code that does that is giving me a headache D: So, the temporarily solution is to remove the Recommended Level code on the fish, which would force things into the proper categories..)
Sadly Seafood has fallen behind on my 'keep as up to date as possible' list of things to do every patch :( I don't think any of the fish on this page: http://ffxiv.gamerescape.co... have any fishing hole/bait/etc information.. I'm gonna try and get all those done before Stormblood releases!
EDIT: There, blanked all RecommendedLevel, and now these categories work again :D Will put 'fix RecLevel' on my gigantic list of things to go back and fix later (I also think I found the page that was assigning those bad categories, but it still was kindof wonky, so meh.. blanking them is the fix for now!@)
The 50-99 page is working again :D