Now, your probably thinking, big deal big deal. However the part that is most interesting is the last part. You no longer catch trash, which should include:Coming in patch 3.3.0, the esteemed tuskarr of the Kalu'ak are proud to introduce to Northrend the Kalu'ak Fishing Derby, a test of fishing skill with a healthy dash of luck! Every Wednesday beginning at 8 PM players can try to catch the elusive Blacktip Shark. Elder Clearwater sits in Dalaran for one hour awaiting the return of the quickest, most experienced fisher to bring him the first catch of the night. This champion fisher will be rewarded in-kind for his or her fishing expertise. Those who aren’t able to return with the first catch will still receive just reward for getting the Blacktip Shark to Elder Clearwater before he takes his leave.
It is said that these sharks’ favorite meal are the bite-sized Pygmy Suckerfish. Perhaps a hook in their waters will do the trick. Because of the increased concentration of fish, you have an increased chance to catch a shark from fishing pools. Don't forget, in patch 3.3.0 you never catch trash from fishing pools, regardless of skill.
Mostly-eaten Bonescale Snapper
Now your also probably wondering what that has to do with anything. Well, you get an increased chance to catch the shark in pools. While it's nothing certain, that should include Pools of Blood. So, kill a animal, get the debuff, jump into water somewhere and start fishing for your shark.
Good Luck!
And sorry for this being more of a "theory" thread but it just popped up and I thought I would share and maybe someone can test it.