If you feed a dolphin, all marine life fades.

Everything worked. The first mistake was that if you get the achievement of the grace of a dolphin - you can swim out beyond the boundaries of the progressed world. And the game freezes.
Secondly, if you feed a dolphin fish, the inhabitants of the sea hang out. Do not move like a dolphin. But you can play. But when you save the game freezes.

translated using google. I apologize in advance for inaccuracies.