This is a long term solution to rising sea levels due to Global Warming, which I though up myself.
We would need to build a massive pipe from Earth to Mars. The Earth side would end in the pacific Ocean. This pipe would pump water (with all the fishies in it too) all the way to mars. Once the ocean has once again reached the desired level, the pipe can be demolished, and astronauts can go to mars to finish stage two of the project.
Stage two would involve waiting until enough oxygen