Well, I still want to get a general idea overall of how often pygmies drop from northrend pools (since I suspect it may be the same drop rate for all the pool types).
I'll go ahead and post some preliminary data, note this doesn't cover all pool types, it just covers Nettlefish, Musselback Sculpin, Glacial Salmon and Dragonfin Angelfish pools. Please note this is ONLY from pool fishing, and it is a very small data sample obtained only from fishing for personal buff food and fish feasts. The percentages from location to location may vary BECAUSE it's such a small sample data set.
i'll start by location, then put it all together:
Borean Tundra, Lake Kum'uya
59 Musselback Sculpin
7 Crystalized Water
4 Reinforced Crate
57 Pygmy Suckerfish
Total Casts: 70
81.43% Pygmies
Dragonblight, Dragonspine Tributary
20 Dragonfin Angelfish
1 Reinforced Crate
1 Crystallized Water
13 Pygmy Suckerfish
Total Casts: 22
59.09% Pygmies
Dragonblight, Drak'mar Lake
7 Dragonfin Angelfish
1 Reinforced Crate
6 Pygmy Suckerfish
Total Casts: 8
75% Pygmies
Grizzly Hills, (no zone subset name)
29 Glacial Salmon
3 Reinforced Crate
20 Pygmy Suckerfish
Total Casts: 32
62.5% Pygmies
Grizzly Hills, Zeb'halak
16 Glacial Salmon
1 Crystallized Water
11 Pygmy Suckerfish
Total Casts: 17
64.71% Pygmies
Grizzly Hills, Zim"bo's Hideout
3 Glacial Salmon
1 Crystallized Water
2 Pygmy Suckerfish
Total Casts: 4
50% Pygmies
Sholozar Basin, Bittertide Lake
22 Nettlefish
2 Crystallized Water
20 Pygmy Suckerfish
Total Casts: 24
83.33% Pygmies
Sholozar Basin, Frenzyheart River
5 Nettlefish
3 Pygmy Suckerfish
Total Casts: 5
60% Pygmies
Sholozar Basin, River's Heart
26 Nettlefish
1 Reinforced Crate
1 Crystallized Water
21 Pygmy Suckerfish
Total Casts: 28
75% Pygmies
Sholozar Basin, (no zone subset name)
4 Nettlefish
4 Pygmy Suckerfish
Total Casts: 4
100% Pygmies
Sholozar Basin, Wildgrowth Mangal
14 Nettlefish
2 Crystallized Water
11 Pygmy Suckerfish
Total Casts: 16
68.75% Pygmies
Sholozar Basin, Wintergrasp River
3 Nettlefish
1 Crystallized Water
4 Pygmy Suckerfish
Total Casts: 4
100% Pygmies
Overall totals:
208 pool-specific fish (74 Nettlefish, 48 Glacial Salmon, 27 Dragonfin Angelfish, 59 Musselback Sculpin)
16 Crystallized Water
10 Reinforced Crate
172 Pygmy Suckerfish
Total Pool Casts: 234
73.5% of casts yielded Pygmy Suckerfish
Please keep in mind this is a relatively small data sample (<250 total casts), so there is a possibly large margin of error (probably plus or minus 7.5%, I'd wager). So the overall chance of catching pygmies from a pool is probably about 66-81%.
Anyone else wanna hammer this down further by adding more cast data?
I'll edit this post when I have over 1k casts total, that should bring the margin of error to about 5% either way.