Fidgety Fish by Ruth Galloway

Tiddler is a very fidgety fish. So much so, that when his mother has had
enough, she sends him out into the sea to swim, Watch out for the Big
Fish she warns. Tiddler flips and glides faster than a rocket. He comes
across several sea creatures before his curiosity gets the better of him
and he enters a big, dark cave When Tiddler hears a loud snap, and
everything suddenly goes dark, he realizes he is in the belly
of the Big Fish ! Now more fidgety than ever, Tiddler jumps and
bumps, tumbles and turns inside the belly of the fish, causing more than
a bit of a disturbance until BURP! The big fish has had enough of
Tiddler.