Why can't fishing retainer catch anything?

[Sounders]

The fish for the daily GC turn ins, for my mule. Many of them are buy specific bait, go to BFE, fish for 15 minutes to get 3.

The main reason I made a fishing retainer was to get Paglth'an Discus, Kissing Trout, Boxing Pleco, Saucerfish, and Sagolii Monkfish, for the level 50 turn ins. None are listed as crafting material, so I'm guessing I won't be able to catch any of them.

So you use GC seals to get ventures. And the main reason you get ventures is to get GC seals. I can see a lot of things that could go wrong here.