Just turned in my last fish to get to exalted today.
Here are my stats:
Dread Wastes: Rikkitun Village - Totals 1805
Spinefish Alpha 26 (1.4%)
Th Jade Forest: Fox Grove - Totals 802
Flying Tiger Gourami 8 (1.0%)
Reef Octopus 7 (0.9%) <----- Isn't that supposed to be coastal??
Valley of the Four Winds: Cattail Lake (next to Fish Fellreed) - Totals 2371
Flying Tiger Gourami 17 (0.7%)
Krasarang Wilds: Anglers Wharf - Totals 2572
Mimic Octopus 24 (0.9%)
Did catch one more Mimic Octopus, but can't find the location.
Also did the Volatile Greenstone Brew
Which gave 385 faction pts iirc
As others have stated, it's probably just down to luck. Mine just took a nosedive..
Started out with a droprate of about 1.6 - 1.9% and a couple of days after writing the above, it went to .4 - .6 for all 3 fish.