Arapaima

An arapaima is a large fish of jungle rivers, covered in huge scales. It is an omnivore. They can grow up to 10 feet long; these statistics describe a small adult5 to 6 feet long.

Originally Posted by Nilbog of the Wizards Community forums. 
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Arapaima
Size/Type	Medium animal
Hit Dice	1d8+3 (7 hp)
Initiative	-1
Speed	Swim 20 ft.
Armor Class	13 (-1 Dexterity, +4 natural)
Base Attack/Grapple	+0/+1
Attack	Bite +1 melee (1d4+1)
Full Attack	Bite +1 melee (1d4+1)
Space/Reach	5 ft./5 ft.
Special Attacks	–
Special Qualities	Low-Light Vision
Saves	Fort +4, Ref +2, Will +0
Abilities	Strength 13, Dexterity 8, Constitution 11, Intelligence 1, Wisdom 10, Charisma 6
Skills	Spot +2, Swim +10
Feats	Toughness
Environment	Warm aquatic
Organization	Solitary
Challenge Rating	1/3
Treasure	None
Alignment	Always neutral
Advancement	2 HD (Medium), 3 HD (Large)
Level Adjustment	—