All of the editions except 4E are pretty similar at low levels, so the easiest approach is to start with what's there, then make some guesses about how ability scores would fit.
Otterkin
Medium Humanoid (Otterkin)
HD 1d8+1 (5 hp)
Initiative +1
Speed 30' swim 40'
AC 12 (+1 natural +1 dex) touch 11 flat-footed 11
Attack Bite +1 melee 1d4
Saves Fort +3, Ref +1, Will +0
Str 10, Dex 12, Con 12, Int 10, Wis 10, Cha 10
Align Neutral