So this RoE Objective is presenting to be more difficult that it should be.  You need to catch 1 gil, as it is the smallest catch possible, to complete.
I have 2 accounts.  On one of them I was able to complete this using Carbon Rod and Lugworms in Bastok Mines based on someone's recommendation.  On the other, I have no such luck.
I tried using Carbon and Lugworms in Bastok Mines, Ebisu and Fly Lures in Al Zhabi, Fastwater and Minnows in Windy Waters.  With variations on the combinations.  I am having no luck with this.  Collectively I have spent maybe 3 hours, if not more, trying to finish this stupid Objective.
Also, I did not use any fishing gear, do not have any fishing Moglifications active.  My Fishing Skill is 110.
I don't know if anyone still reads these forums, but any help or advice is greatly appreciate.  This is not a game breaking goal for me, but I just want to finish it.                                    
                
            