Angler

Updated for 5.1:

Which +fishing gear/enchants don't stack?

Several *inaccuracies* are still being told about this item and what no longer stacks +fishing! However, it's pretty simple:

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• All base bonuses on fishing gear and pole stack. Any hat ([item=19972]/[item=33820]/[item=88710]), boots [item=19969]/[item=50287]) and pole (too many to list here) all stack, no matter how high or low their bonus is, and they will all stack with consumables like Captain Rumsey's Lager too.
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• It's only the +5 enchants (pole/gloves) that don't stack; so, only this Angler enchant and [item=19971] don't stack.
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• HERE'S THE TRICK: You can stack +3 enchant on pole ([item=34836]) with this +5 enchant on gloves for a total of +8!
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• Similarly, you can stack +5 enchant on pole with +2 enchant on gloves (Fishing) for a total of +7. Therefore, not having the best pole enchant is effectively the best way to increase your overall fishing by +1. However, +5 on pole seems much easier to get than +3 since you can obtain it from the 3 first places in Stranglethorn Fishing Extravaganza plus the rare fish that doesn't have a too bad rate, whereas you can only get +3 quite rarely from a TBC daily.
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That's all there is to it.

As a curiosity, the Angler enchant was known to have several issues with its rod requirements:

This enchant was included in the 3.3 patch, learned from the drop Formula: Enchant Gloves - Angler (more comments to be found there). For the longest time it said it required "Runed Cobalt Rod", which existed in early WotLK PTR but was never implemented in the release. In reality, it required Runed Titanium Rod, but since it was learned at 375 and didn't have any level requirement itself (tested on vellum), one would expect it to work with the previous Runed Eternium Rod (from TBC, since there was absolutely no other enchanting rod in WotLK).

Before all that (in mid November '09 3.3 PTR data, when the formula didn't exist yet), this item would require "Runed Azurite Rod" instead, something even odder since only Azurite Bar has existed in game data but was also never implemented.

List of items to increase the skill of fishing

Fishing Poles
+3 [item=120163]
+3 [item=12225]
+3 [item=46337]
+5 (2)*Strong Fishing Pole
+7 [item=84660]
+8 (3)*[item=6366]
+10 (1)*[item=25978]
+10 (1)*[item=19022]
+10 (1)*[item=6367]
+12 [item=45858]
+13 [item=44050] (underwater breathing)
+13 [item=84661]
+13 [item=45991]
+13 [item=45992]
+13 [item=116826] (+10 Lure) (Alliance)
+13 [item=116825] (+10 Lure) (Horde)
+14 [item=118381] disappears after 1 day (real time)
+14 [item=19970]
+15 [item=133755]

Fishing Lines
+1 [item=68796]
+3 [item=34836]
+4 [item=116117]
+5 [item=19971]
+6 [item=153203]

Lures(standard duration 10 min)
+2 Glass Fishing Bobber
+3 Shiny Bauble
+5 Nightcrawlers
+5 Aquadynamic Fish Lens
+7 Flesh Eating Worm
+7 Bright Baubles
+9 Feathered Lure
+9 Aquadynamic Fish Attractor
+9 Sharpened Fish Hook
+9 [item=46006] duration 1 hour
+10 Heat-Treated Spinning Lure duration 15 min
+10 Worm Supreme
+10 [item=124674] disappears after 1 day

Hats
+5 (2)*[item=19972]
+5 [item=118380] disappears after 7 day (real time)
+5 [item=118393] disappears after 7 day (real time)
+5 (2)*[item=93732] Summon a pool of Shipwrecked Debris
+5 (2)*[item=33820] (+7 Lure)
+5 (2)*[item=88710] (+10 Lure)
+8 (3)*[item=117405] (+10 Lure)

Boots
+5 (2)*[item=155459] (Alliance)
+5 (2)*[item=155484] (Alliance)
+5 (2)*[item=155468] (Alliance)
+5 (2)*[item=155476] (Alliance)
+5 (2)*[item=19969]
+10 (1)*[item=50287]

Misc
+2 [item=11152]
+5 [item=50406]
+4 [item=152556] duration: 2 min / 5 min cooldown
+5 Captain Rumsey's Lager duration: 3 min
+5 [item=88535] duration: 10 min
+5 [item=110508] catches only in Draenor Zones / duration: 5 min / disappears after a minute / can not apply to yourself
+10 [item=44012] work only in Dalaran (Broken Isles) / ~33% chance

Other useful items
[item=85500]
[item=107950] (only for Mages class)
[item=85973]

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*For groups of items marked with a digit (1) (2) (3), the skill of fishing is not cumulative if used together with other items of the same group.

In War Within, this enchant only boosts Northrend Fishing by 5, not Fishing in general.

EDIT: The enchant now properly says that this enchant only boosts Northrend Fishing as of Oct 22, 2024 -- at the time of this post, it didn't say that.