Aggressive, Sometimes Red-Bellied Fish
This page is the CodyCross answer for the clue below from The Netherlands, Group 2104, Puzzle 5 (Flevoland Lakes).
Question is: Aggressive, Sometimes Red-Bellied Fish
and the answer is: PIRANHA
Word Meaning:
PIRANHA — (ichthyology) Any of certain freshwater fish of the subfamily Serrasalminae, native to South America; they are characterised by razor-sharp teeth and a reputation of being ferocious predators (despite most species being omnivorous).
Definitions from Wiktionary.