From doing the daily on the current beta  here are some observations to add to El's quest information.
Quest: Armored Carp
The 'Armored Carp' required for the quest can be found close by, to the south of the buildings.
The easiest way to do this is by equiping the item then swim down close up to the carp and click the 'Anglers Fishing Spear' to use it. It should hit any of the carp close by. The fishing spear does not seem to work at distance (unlike some NPCs who use a fishing spear)
You can just kill the carp and loot the item without using the spear (though it is more fun)
Currently the fishing spear stays in your bag after completion. It may be a bug as it leaves multiple copies in you bag (not auto-deleted) But like quite a few quest items, it may be intentionally left, to let you use it as a novelty item.
You can equip and use the fishing spear any time and use it to kill other similar low level fish (they are not tagged as Critters but actually level 10 Beasts) It has a nice animation which it makes it a fun thing to throw at friends. It doesn't hit any objects (apart from the intended fish types), therefore, sadly, it can not be used to spear Taurens...
EDIT: I tried it out with the level 1 critter fish at Sri La Village 'Saltscale Carp and it did not hit them so not sure if this does work. Will check some more.
The quest states 'Krasarang River' which will show up above the mini-map when you are in the right area. 'Krasarang River' extends north up from a line across from Dawnchaser Retreat to the east of the Temple of the Red Crane (not included) and up to Krasari Falls. Non of these adjacent areas is included even the Temple which lies within the Krasarang River area.
You can also catch them on the coast at the waterfall where the river enters the sea in 'The Deepwild'.
Quest: Fishing for a Bruising
Make sure you are killing the right NPCs which are the
Riverblade Raider as the others don't count. To make it easier kill the ones already fighting as they have low health. There is one on a roof which will bug out as it can't enter combat. They have 393k hp.
Watch the sharks as you descend down to the cave. Hug the rock keeps you mostly safe.
Apparently you do not get the quest complete if in a party when killing him. Tried it with another player. I got the quest complete but he did not. Generally now you get credit for killing a quest NPC even out of a group so not sure how this is different. Perhaps this will change.
As you enter the cave be prepared for some music! Having never been to the Darkmoon Faire, it became obvious when I did, that the cave used for this quest is the same cave there underwater. And of course I understand the music now when you go into Snapclaws cave ;) Wonder if they leave it in as I thought it was a nice touch to a quest.
Quest: Like Bombing Fish in a Barrel
I can confirm that the 'Goblin Fishing Raft' next to Fiznix is working when I did the quest a little while ago. Comes with a barrel for the fish (quest title reference) and a neat stack of Goblin Fishing Bombs. Just click and you get the 'Rafting' buff although no animation like the one gained at Marista Village and a shorter duration version.
Also, there is another raft close to the spot where the Sting Ray are so if you lose the Rafting buff (any damage will lose the buff now i.e. if attacked by the shark) you can get another without having to come back.
Once you have the raft just go round to the spot (you will see a small cannon and pile of bombs next to Goblin chair, umbrella and general trashy mess) or fly there and get a Rafting buff there.
The buff is;
Grants the ability to raft across oceanic waters in Krasarang Wilds.
10 minutes remaining
10 minute buff restricted to the zone.
Like El said on the page, you can use the bombs on water not land. They can be used for a variety of fun, including showering Fiznix himself...! They no harm to other NPCs but do show fish flying up out of the water as part of the amination. The bomb currently stays in your bag after quest is handed in.
Note the small fish flying up out of the water in the animation.
For the actual quest, it's best just to drop icon onto the bar set with a button, then get around 10 yards range between you and the Sting Ray and spam the button. It throws between 3-5 bombs out in rapid sequence which, if the range is right kills the ray easily. Just steer the raft and spam the button and the quest is done very quickly.
Watch out for the shark which will attack you and take off the Rafting buff and leave you in the water being attacked.
You can kill the ray though they have high hp. Not sure if they still drop the item. But using the bombs is way easier and more fun.
Until you hand in the quest you can recast the Rafting buff, so feasibly it could be used at anytime if the quest is not handed in.
I suspect that the same Rafting buff will be available for the Shipwreck pool quests as there are rafts there also.
Double check you have 'Dojani River' above mini-map to get the drops.
Doing the quest I only got a shock from the first eel caught, not after. Unsure if this is intentional, a proc chance or a bug.
The shock appears to be only visual as there was no damage recorded in the Combat Log. Also, it did not remove the water walking buff which is normally the case if damaged.
Quest: Huff & Puff
Same as for Armored Carp; get up close and it usually hits first time. Spam the icon when spear equipped.
Make sure pet is set to passive as one thunderclap will kill your intended prey...
Quest: Jagged Abalone
Fisherman Haito gives you the Water Gliding buff so no worries about breathing and the 50% movement speed increase underwater. Best to do it soon after taking the quest so as not to lose it while doing other quests.
Bluetip Reef Sharks have 393k hp as do most lvl90 mobs.
Occasionally you get a Baby Bluegill Murloc spawn when looting the abalone, then despawn after a few seconds. Photo here;
Quest: Viseclaw Soup
The area indicated on the mini-map is pretty restrictive and does not show all the places you can find Viseclaw Fisher. You will find a lot just a bit further east in Krasarang Cove where they are a shared spawn with the Viseclaw Scuttler.
And added bonus is that occasionally you will see a family including three Viseclaw Fry which also drop the quest item.