Great!
Updated.
Taking RavingRay's suggestion upthread, here's the piranha swarm for inspiration for our flying fish swarms...
Tiny Animal (Aquatic, Swarm)
Hit Dice: 8d8+11 (47 hp)
Initiative: +6
Speed: Swim 40 ft. (8 squares)
Armor Class: 15 (+2 size, +2 Dex, +1 natural), touch 14, flat-footed 13
Base Attack/Grapple: +6/-
Attack: Swarm (3d6)
Full Attack: Swarm (3d6)
Space/Reach: 10 ft./0 ft.
Special Attacks: Distraction (DC 15)
Special Qualities: Half damage from slashing and piercing weapons, low-light vision, scent, swarm traits
Saves: Fort +7, Ref +8, Will +3
Abilities: Str 4, Dex 15, Con 12, Int 1, Wis 12, Cha 2
Skills: Hide +10, Listen +9, Spot +8, Swim +5
Feats: Alertness, Improved Initiative, Toughness
Environment: Warm aquatic
Organization: Solitary or school (2-4 swarms)
Challenge Rating: 4
Treasure: None
Alignment: Always neutral
Advancement: None
Level Adjustment: -
Reduce damage, add poison and some sort of "flight"?
According to various sites...
This fish has been captured "flying" out of the water for a full 45 seconds.
These fish have been know to reach speeds of over 60 mph and travel over 1300' in one glide.
The maximum size for one of these fish is about 1-1/2'.
The Flying Fish feeds mostly on plankton floating about.