Inflatable Ball, Swim Organ That Fish Use to Float
This page is the CodyCross answer for the clue below from The Netherlands, Group 2109, Puzzle 4 (Eindhoven University).
Question is: Inflatable Ball, Swim Organ That Fish Use to Float
and the answer is: BLADDER
Word Meaning:
BLADDER — (zoology) A flexible sac that can expand and contract and that holds liquids or gases.
Definitions from Wiktionary.