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.
Male Fertility and Alcohol. Men tend to drink more than women do and can generally handle it. However, the night out with the boys also affects their fertility. Consuming excessive amounts of alcohol lowers testosterone levels as well as the quality and quantity of sperm.veryone enjoys the odd glass of wine or whiskey and there is nothing wrong with unwinding in that way if you enjoy it. For people trying to conceive it might be worrying, as one has to answer the question of whether or not drinking alcohol can affect their fertility.