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.
Making use of this fertile time will increase your chances at pregnancy by almost 50%. Keep in mind, that the maleâs sperm has the ability to live up to 5 days within your reproductive system depending on how hospitable the environment of the vagina is, so you donât need to have sex the moment you ovulate.