I don't know the exact fishing gathering rate, but its quicker than farming, i think, so if you're on a fish heavy map, go for it. Sure, hunting provides more meat quicker, but on a low hunt map, youre in trouble.
Turtling basically means playing defensive, towers up, barracks close to base, and walls, so it is, in idea, impenetrable, (like a turtle!) It's often considered the weaker option in AOM, due to its fast paced nature, and the fact that walls, just aren't as effective as in other Age games.
Booming is where you dont really attack or raid continiously, you wait til you get a bigger pop-cap, and army, and upgrades, then go for one big attack. There are pros and cons for this, of course.
EDIT: dont forget, if you keep your villies on wood, you won't need as many on food, your fishies will keep your AQ'ed villies afloat. Thats the idea anyway.
[This message has been edited by Thebean (edited 11-25-2004 @ 04:44 PM).]