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.
The fact, however, is that you can influence the sex of the baby. Most of you may brush it off as a myth but it is true and the concept involved is very simple. You just have to time the conception right and you can increase the chances of having a girl baby or a boy baby.