Cobra Trout (CR 1)

Tiny Animal (Aquatic)
Alignment: Usually chaotic neutral
Initiative: +0; Senses: low-light vision and scent

AC: 12 (+2 size), touch 12, flat-footed 12
Hit Dice: 1d8 (2 hp)
Fort +1, Ref +4, Will +1
Speed: 5 ft., swim 30 ft.
Space: 2.5 ft./2.5 ft.
Base Attack +0; Grapple -13
Attack: Bite +4 melee
Full Attack: Bite +4 melee
Damage: Bite 1d3-4 and poison
Special Attacks/Actions: Poison (Fort save DC 14 to negate) 1d6 Con/2d6 Con
Abilities: Str 4, Dex 15, Con 12, Int 3, Wis 12, Cha 4
Special Qualities:
Feats: Weapon Finesse (bite)
Skills: Swim +5
Advancement: None
Climate/Terrain: Temperate aquatic (Deeping Stream)
Organization: Solitary or school (2-4 swarms)
Treasure/Possessions: None

Source: Converted

The cobra trout, which lives in the Deeping Stream, is one of the few fresh water fish with a poisonous bite. Extremely territorial, the cobra trout lunges at any creature that comes within a few feet. This fish can exist on dry land for as long as an hour, using tiny fins to haul itself along the ground. Fortunately, its bright silver scales make it easy to recognize and avoid.

Poison (Ex): Injury, Fortitude DC 14. Initial damage 1d6 Con, secondary damage 2d6 Con.

Skills: A cobra trout has a +6 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.

Aquatic Subtype

Creatures with the aquatic subtype always have swim speeds and thus can move in water without making Swim checks. An aquatic creature can breathe underwater. It cannot also breathe air unless it has the amphibious special quality.