Good guide. I've been trying to get the mount for over a week now. I do this way:
30 minutes a day; fish 2 days for glacial salmon from Grizzly, 1 day musselback from Borean, and 1 day nettles from Scholazar, and I mail all the fishes to my alt bank. I do 2 days on glacial salmon because I use firecracker salmon for myself or in group, and I make fish feast for the raid.
If by chance I have way too much fish and not needing them fast enough, I sell extra stacks for gold.