for a mage fisher:
Get someone with inscription to make you a Water elemental slayer spellbook to hold, and make sure you have good Evaluate Intelligence.
Cast Protection, as well.
My mage/fisher with 120 magery/120 eval and about 20% Spell damage increase from equipment does about 200-300 points damage to a single water elemental with an e-bolt (depending if she has other SDI stuff on or not) and if she uses chain lightning on a group of 3, they are still dead by about 50% more damage than their race maximum.
In fact, she's been known to 1-hit kill paragon water elementals in Ilshenar on occasion, with an e-bolt.
Her template:
120 Magery
120 Eval
100 tactics
100 Fishing
100 Meditation
100 Resist Spells
80 Chivalry
(will sometimes substitute 100 Inscription for one of the other GM skills)
Only wears skill-boosting equipment when using a mage-weapon bow. suit is just a point or two shy of all-70s, with max LMC and LRC, and 2/6 FC/FCR. (though the last part is moot if I cast Protection, such as when I go fishing - those sea serpents chain-cast level 1 spells so fast you sometimes can't cast without protection)
(and yes, she's hell on wheels with a mage weapon - gets more DPS with a weapon than with spells against some peerless, in group hunts, and saves her mana for EoO, consecrate, summons and rezzing/cross-healing others)