Huge (Animal (Aquatic)) CR 9
HP 147, hd18d8+66 AC 17 (?2 size, +2 Dex, +7 natural), touch 10, flat-fooded 15 Fort +14, Ref +13, Will +12 Speed Swim 60 ft. (12 squares) Initiative +2 Spot , Listen
Standard attacks BAB +13, Grapple +27
Attacks
Full attack: Bite +18 melee (2d8+9)
Special Attacks/Qualities
Improved grab, swallow whole
Keen scent
Skills Listen +12, Spot +11, Swim +14
Feats Improved Natural Attack (bite), Toughness (4), Weapon Focus (bite)
Str 23 Con 17 Dex 15 Int 1 Wis 12 Cha 10
Alignment Always neutral, Environment Cold aquatic, Organisation Solitary or school (2?5)

Dire sharks attack anything they perceive to be edible, even larger creatures.
This monstrous fish can grow to a length of 25 feet and weigh more than 20,000 pounds.

Dire sharks bite with their powerful jaws, swallowing smaller creatures in one gulp.
Improved Grab (Ex): To use this ability, a dire shark must hit with its bite attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and can try to swallow the foe in the following round.
Swallow Whole (Ex): A dire shark can try to swallow a grabbed opponent of up to one size smaller by making a successful grapple check. Once inside, the opponent takes 2d6+6 points of bludgeoning damage plus 1d8+4 points of acid damage per round from the shark?s digestive juices. A swallowed creature can cut its way out using a light slashing or piercing weapon by dealing 25 points of damage to the shark?s digestive tract (AC 13). Once the creature exits, muscular action closes the hole; another swallowed opponent must cut its own way out.
A Huge dire shark?s gullet can hold 2 Large, 8 Medium or Small, 32 Tiny, 128 Diminutive, or 512 Fine or smaller opponents.
Keen Scent (Ex): A dire shark can notice creatures by scent in a 180-foot radius and can detect blood in the water at a range of up to 1 mile.
Skills: A dire shark has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered.
It can use the run action while swimming, provided it swims in a straight line.
SEE WIKIPEDIA ENTRY: Shark

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System Reference Document -> List of Creatures (SRD)