The older that such fish become, the more mercury they may have absorbed. Anything that eats these fish within the food chain also consumes the higher level of mercury that the fish have accumulated. This process explains why predatory fish such as swordfish and sharks or birds like osprey and eagles have higher
The goal, then, when it comes to having a boy is to increase the likelihood that a Y chromosome sperm reaches the egg first. Many medical researchers believe that Y chromosome sperm are faster swimmers, but that X chromosome sperm have more endurance.
Alcohol And Sperm. Men who suspect they have a fertility problem may have already heard or read about the importance of a good diet and non-consumption of alcohol and drugs for a healthy sperm count and good sperm quality. However, a good many men and women trying to conceive may be unaware of the effect that alcohol can have on a man's sperm. The bad news for men is that the damaging effect of alcohol on sperm is a scientifically proven fact.