Padak -2012- -

In the end, Padak manages to jump out of the tank and flops toward the open sea, but she is caught mid-air by a seagull and carried away — presumably to be eaten. Spotty, watching from the tank, is left behind.

Padak, however, refuses to surrender. She tells Spotty and the others about the vast, free ocean. She devises a plan to escape. The older fish think she’s crazy, but Spotty is inspired. padak -2012-

It seems you’re asking for the story of the 2012 film Padak (also known as Padak: Swimming to Sea or A Fish Story in some English releases). In the end, Padak manages to jump out