The current lot of fishing dailys are just plain awful.

Once you've completed the achievement, leveled your fishing to 525 there's absolutely no incentive to continue doing them. Why ? Well apart from the low gold payout the biggest disincentive are the rewards from the Bag of Shiny Things:

Weather Beaten Fishing Hat (been around since Burning Crusade patch 2.4.0. 25th March 2008), Strand Crawler Pet, Jeweled and Bone Fishing Poles (been around since Wrath of the Lich King patch 3.1.0. 14th April 2009).

That's it. Recycled rewards from the past two expansions. All the other drops from the bag are low value vendor trash, and to add insult to injury both of the Wotlk fishing rods have been nerfed in value from gold to mere silver.

Look at the BC fishing rewards: 4 pets, 2 Ring, Blue Gem, Fishing Line, Recipe, Hat.
WotLK: Pet, Rods, 2 Quest Starters, 5 Ring, High Value Vendor Trash, Epic Gems, (BC Hat, recipe and Fishing Line), Tiny Titanium Lockbox.

And just to top off how god awful fishing is, on the PTR at the moment the infamous Glass Fishing Bobber becomes a simple lure: +15 skill for 10 minutes.

So here's my suggestion, upgrade the rewards to Cataclysm standard, after all its a new expansion, so how about some new rewards ? Add some new rare or even epic items to Cataclysm fishing pools (and provide an incentive for small guilds to complete the ill conceived Catch 10,000 fish from pools achievement) Give some reason to go back and do them.