Bitsizes are small green-like fish.
The Bitsize attacks Donkey and Diddy Kong by biting. These enemies appear alone or in a large school. They can not be defeated by Donkey Kong and Diddy Kong so they must avoid it. However, Enguarde may defeat them in one strike. They do not chase the Kongs or Enguarde. Instead, they move in a random pattern left or right or back and forth the entire time.
Bitesizes can be found in the mini-game Funky's Fishing in the Game Boy Color and Game Boy Advance remake of Donkey Kong Country where Donkey Kong must catch as much fish as possible. The Bitesizes can be regular colored or pure red, blue, green, or yellow or even flashing ones.