Effects Of Overfishing Atlantic Cod on East Coast Ecosystems

This increased the loss of large zooplankton species (> 2 mm), as shrimp and crab populations prefer to eat (Frank et al., 2005; Scheffer et al., 2005). Due to the small amount of zooplankton, zooplankton population increases due to pressure reduction to zooplankton (Frank et al., 2005; Scheffer et al., 2005). Finally, the concentration of nitrate is lower indicating more uptake of the phytoplankton population (Frank et al., 2005; Scheffer et al., 2005).

The eastern coast ecosystem of Canada is affected by special changes in the ecosystem because it is hardly damaged by salmon overfishing. The east coast of Newfoundland was historically known as a fishing ground. According to the article of the Greenpeace Archive, in 1497 explorer John Cabo says "I almost blocked my boat" a huge squid school. The Canadian government completely banned the fishery in this area for the 5th century due to the collapse of the ecosystem. With the decrease in the number of large fish at the food grade level, small fish, and large invertebrates such as Northern shrimp and Northern snow crab, increased the population significantly. This rise in food levels has led to the shortage of zooplankton (> 2 mm), a large edible plant that is its nutritional base. In addition, the decrease in zooplankton is responsible for the increase in the number of phytoplankton populations.

North Atlantic salmon. Overfishing has historically led to a significant reduction in the number of such fish, but its population usually rebounds. Not far from the northeastern coast of North America, the population did not recover after the collapse of the 1990s. Scientists said, "The entire ecosystem seems to have changed," he said. "This may be related to the change in flow and the influence on the climate as a result of the influx of cold water in the Arctic Ocean." Corals and corals of the world's coral reefs. For various reasons, animals building coral reefs are "almost anywhere", Pörtner said, including warming the water - corals are sensitive to changes in sea temperature. For example, Acropora cervicornis has been widespread in the Caribbean, but now it is probably limited to a few narrow areas due to global warming. (Read more about coral and global warming)