Nowadays people are very fond of diving within the water and swim. This has become a fashion. So next life they are going to become fish. Yes. If at the time of death, you think of how to swim very nicely within the water, next life nature will give you a fish life. That is God’s mercy. Why artificially try to become a fish? You become actually a fish. That is nature’s gift.

From Srila Prabhupada’s lecture on Bhagavad-gita 9.4 — 22 April, 1976