As a player I would like the joys of experiencing all forms of content and success including pvp, pve, leveling alts and achievements. Currently as a 7 year player; Life and raid leading has severely reduced the amount of things I can accomplish in game. I highly suggest the drop rate increase to a reasonable percentage so that similar players like myself can complete this achievement.
For myself it takes a minimum of [1 hour] to fish up the 3 daily fish. This is most likely during a good day.
[168 hours] in a week
 school related courses / homework
This leaves 36 hours a week eating, going outside, doing dailies and having uncommitted fun in the game. Assuming I spend 1 hour a day catching these fish with the low catch rate, thats at least 7 hours a week (or 19% of free time).
4% of my week Id love to spend doing pet battles, pvp, leveling alts instead on working on this because of my need to fill in blanks on achievement tab. To conclude I implore the team to consider making this achievement take less time, I think Nat Pagle will understand since we have been working with him for 8 years =)
A long time subscriber who has never ended monthly payments