Carnivores are the second kind of fish to be encountered in Adventure Mode. A carnivore eats small guppies, and is food for ultravores. It drops diamonds worth $200 in Adventure Mode, Time Trial Mode and Challenge Mode, and costs $1,000.
In Virtual Tank, a carnivore is always available for purchase in The Fish Emporium for 100 shells. Carnivores can also come in a variety of colors that are a more expensive the regular carnivores at 1,000 shells each, as well as a color-changing variety for 5,000 shells.
All carnivores in the Virtual Tank drop blue conch shells worth 5 shells each and they typically eat baby guppies as normal.
Johnny V is a rare, pre-named carnivore. Instead of eating small guppies, it eats pizza and has color-changing properties. It can be purchased for 50,000 shells.
Ludwig is a rare, pre-named carnivore. Upon being feed, it will sing songs which are composed by Ludwig Beethoven. It can be purchased for 50,000 shells
- It resembles a piranha in visual appearance. If it is assumed that it is actually a piranha, this puts the game at 1/13th scale, which means that most aliens are around three feet long.
- The Carnivore is known as "Oscar" in some of the game's files.
- A carnivore and a guppycruncher are one of a pair of fishes which make similar sounds when they expire. The other pair which shares the same manner are breeder and starcatcher.
- In the Virtual Tank, carnivores can have 14 possible color combinations. Using modifications, such as Fishinator 2, this is further increased to 4,722,366,482,869,645,213,696 (2^72).