Medium (Aberration (Aquatic)) CR 2
HP 11, hd2d8+2 AC 13 (+1 Dex, +2 natural), touch 11, flat-fooded 12 Fort +1, Ref +1, Will +3 Speed 20 ft. (4 squares), swim 40 ft. Initiative +1 Spot , Listen
Standard attacks BAB +1, Grapple +5
Attacks
Full attack: Bite +5 melee (2d6+4) and 2 claws +0 melee (1d4+2)
Special Attacks/Qualities
Rake 1d6+2
Darkvision 60 ft., amphibious
Skills Hide +6*, Listen +7*, Move Silently +6, Spot +7*, Swim +12
Feats Alertness
Str 19 Con 13 Dex 13 Int 10 Wis 10 Cha 6
Alignment Usually lawful evil, Environment Underground, Organisation Brood (2?5) or pack (6?15)

A skum is about the same height and weight as a human. Skum speak Aquan.

Rake (Ex): Attack bonus +0 melee, damage 1d6+2. A skum also gains two rake attacks when it attacks while swimming.
Skills: *Skum have a +4 racial bonus on Hide, Listen, and Spot checks underwater.
A skum 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.

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System Reference Document -> List of Creatures (SRD)