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Instead of directly farming these another great way to get them is by opening the "Moldy Bags" in the game. These have an extremely good chance of giving you a fine crafting material (a blue one, like this one) and are rather cheap on the Trading Post. Usually ranging from 20 - 50c a bag, depending on the type of bag.

While you won't get rich buying bags, opening them and selling the reagents on the Trading Post you definitely will be able to stock up your collectibles tab at an insanely fast rate. I made a video on how this method works, if you'd like to see it: Fine Crafting Material Farming Video for all skill ranges.

Here are a list of all the bags in the game so you know which type you'll need to buy for whatever item you're after.

Tiny Moldy Bags (0 - 50 Components)

Small Moldy Bags (25 - 100 Components)

Light Moldy Bags (75 - 175 Components)

Moldy Sacks (150 - 250 Components)

Medium Moldy Bags (175 - 300 Components)

Large Moldy Bags (300 - 325 Components)

Heavy Moldy Bags (325 - 400 Components)

They do drop but the ratio is way worse then stated 1/20 kills so far.

Tail Fins (Common)

Large Scale (uncommon)

Armored Scale (Rare)

and I used complete set of MF with food and guild banner.

There has to be a better spot please post if you find one.

Thanks

Agreed, I have tried killing the mentioned Barracuda, and they don't drop for me nearly as much as other folks are saying they do.  I've also had them drop off of the Jellyfish around there, with just about the same luck.

I also tried farming the Krait in WvW, as they are 80+ and krait have chance of dropping scales but while I did get a ton of Large Scales, I didn't get a single Armored Scale.

I have found that, if I kill just one barracuda at a time, the drop rate was extremely low.

As a guardian, I was equipped in complete magic find rare gear with the Superior Runes of the Pirate x 5 and Superior Rune of the Traveler x1, I also popped a Magic Find Booster and Spicy Pumpkin Cookie.  So, all in all Cookie is +30% MF, Booster is +50% MF, set is +18% MF, and Runes +60% MF to total around 158% MF (if my calculations on the runes are correct, anyway).  As my 7 and 8 skills, I had the hammer and sword that would fight with me.  My strategy, was to go through and gather about six of them, and when I stopped, they'd start attacking. Those six would turn quickly into 10-14 depending on how many times the decided to call for help.  The moment they attacked, I'd pop both the sword and the hammer.  If I went down, I would almost instantly rally until they were all dead.

In roughly two and a half hours of doing this, resting until my hammer and sword reset before gathering another batch, I got-

Enough Tail Fins to get me 1.5g at the vendor

153 Large Scales

33 Armored Scales

Enough blues and greens to fill all my bags (105).  Sorry, I didn't count, nor did I keep track of what they salvaged into.

Three golds, equaling 4 globs of ectoplasm and three orichalcum ore.

So, I can confirm that this method does, indeed work if you work it right.  :)  And thanks to the kind soul who uploaded the screenshot telling me exactly where these little beasties are located, I was able to not get lost once I discovered that waypoint.

A good spot to get these is off the barracuda near Dimotiki Waypoint in the West side of Frostgorge Sound.

Thank you, I will try that spot out.

I second this. They drop every fourth to fifth kill.

I will also confirmed, that they do indeed drop of Barracuda near Dimotiki Waypoint. I was there for about an hour and ended up with 10 Armored Scales and 70 Large Scales. I also had about 100% magic find on from food + Booster item.

And the reason you can't share that information here is?

I had one drop from the blue oozes directly north-west of Meddler's waypoint in the Cursed Shore. I'm sure, like all other tier 6 materials, this one will also drop quite rarely.