Shark Tale(2004)

Oscar is a fast-talking little fish who dreams big. But his big dreams land him in hot water when a great white lie turns him into an unlikely hero. At first, his fellow fish swallow Oscar's story hook, line and sinker and he is showered with fame and fortune. It's all going along swimmingly, until it starts to become clear that Oscar's tale about being the defender of the Reef is all wet. Oscar is finding out that being a hero comes at a Market Price when his lie threatens to make him the Catch of the Day. Now he has to tread water until he can get the scales to tip back in his favor again.