Living in a place filled with rubbish is not only unbearable but confers risk to our physical health. This notion will seem to apply intuitively to marine life that is constantly subjected to widespread pollution. However, few would consider how overfishing negatively impacts the overall functioning of the ecosystem. With predatory fishes that are growing at a faster rate being targeted preferentially by fishermen, the genetic diversity of this highly favored fish species is expected to decrease.(Holmes, 2011)
As fishes vary substantially in their degree of nitrogen and phosphorus excretion, the imbalance between the population of excessively and lightly fished species could disrupt nutrient recycling pattern where species at the lower bottom of the food chain would propagate faster. This consequently leads to rising concentration of nitrogen and phosphorous, a condition that favors the uncontrolled growth of algae. When these algae dies, they further drain away oxygen when they decompose posing greater threat to aquatic life.