Brilliant Smallfish

is a low level cooked food item which can usually only be obtained by cooking a, a fish that can be caught in most low level freshwater ponds/rivers.

Source
This item can be created by cooking, and is also a quest reward.

Cooking
This item is crafted by Cooks. There is no minimum skill level for this recipe - you just have to have the Cooking skill.

The components are:
 * 1x

Required:
 * Cooking fire

is sold by the following vendors, for :
 * in Stormwind
 * in Dun Morogh
 * in Mulgore
 * in Loch Modan
 * in Undercity
 * in Tirisfal Glades
 * in Teldrassil
 * in Thunder Bluff
 * in Elwynn Forest
 * in Teldrassil

as a Quest Reward
is a quest reward for in the draenei starting zone Azuremyst Isle. The quest starts with a draenei named Aeun on a hill above Ammen Ford.
 * Objective:
 * Speak with Caregiver Chellan at Azure Watch on Azuremyst Isle.