My Nine Yin-Yang Sisters

Why are two goldfish buried beneath the crematorium? Why must each fish weigh exactly eight liang and one qian? I'm a crematorium worker at Furnace No. 9. Nine is a number of great significance, and it has brought me nine chances at blind dates. At first, none of the nine women would give me a second look. But later, they all fought to marry me. Who should I choose?