I just checked (in linux). You are right in that the animations for THR, CST, SLA, ISL and SHT don't include the fishing pole. I know that's a shame, but that is so because the original artists didn't draw the fishing pole in those animations. I gave it a try, but even though I "massaged" some assets myself, that's really not my field.
There are a couple more weapons that also don't include all animations, but they are good assets so I included them.
In regards to the fishing pole, you should have got a image suffixed with _fish.png. That's where you have the fishing animation frames.
Do you get that file ?
I hope this explains what you are experiencing. Tell me if it doesn't.