Okay, first I must say that I'm busy manso I can't play wow much on one session. But I have a good way to make gold... You need the fishing bot from here.
Building fishing up to 225 is quite easy, I used to fish in OG -> barrens pools -> Tarren mill and then you are 225
And last evening on 23:30 Finland time I started my idea.
1.I went to my pc's control panel, display options and to the screensaver tab. I put my screensaver off, and clicked that button "Virransäästö" what should be "power saving" on english pc (sorry my one is in finland) and put all power saving settings to never. Then ok->ok.
2.A great place to fish (found by me) is the island on western feralas. All the enemies for quests are the coast and I prove that any mob will not attack you in the island =D. For security reasons, go to the western side facing to the sea, so people looking to the see wont see you behind the hill. I also added a new chat window for only whispers. Then start fishing... I left it open for 5 hours when I slept... I got
254x Raw spotted yellowtail
100+ (didn't check ;P the amount was only *) Raw glossy mightfish. I think near 150.
And then... 60+ stonescale eels =D They sell in my server for 1g each! On some servers maybe even more! (drop rate about 10-15%)
Trust me... This works very great
EDIT: This is how I looked today morning (fished yesterday with fishbot before about 1hour and posted rest of fish to banker)
EDIT2:I heard u have a better change to get eels on 0-12, less change on 12-24. I recommend starting after clock 0, then most ppl go sleep or raid, and u can fish the whole morning to about 8pm safely.