n tiny animal aquatic 

Perception +4; low-light vision

Skills Acrobatics +2, Athletics +4

Str +2 Dex +0 Con +2 Int -5 Wis +1 Cha -2

AC  12; Fort +5, Ref +3, Will +2

HP 12

Toxic Body Anyone who hits a pufferfish with a melee unarmed attack or a non-reach melee weapon must succeed at a DC 13 Reflex save or be pierced by a spine, taking 1 piercing damage and being exposed to pufferfish venom.

Speed swim 15 feet

Melee [>] bite +6, Damage 1d6+1 piercing plus pufferfish venom

Inflating Rush [>>] The pufferfish Swims up to its Speed and then inflates. Each creature within 5 feet of its space at the end of its movement must succeed at a DC 13 Reflex save or take 1 piercing damage and be exposed to pufferfish venom.

Pufferfish Venom (incapacitation, poison) Saving Throw DC 16 Fortitude; Maximum Duration 24 hours; Stage 1 1d4 poison damage (1 round); Stage 2 1d4 poison damage and flat-footed (1 round); Stage 3 1d4 poison damage and paralyzed (1 round); Stage 4 1d4 poison damage and paralyzed for 2d10 hours (1 round)

Bestiary 3, page 99.