Explain why El Nino causes a serious decline of the Peruvian fishery:
Firstly the El nino causes a rise in sea temperature and a convection current will occur where the warmer, less dense water with few minerals rise to the top but the colder Humboldt current sinks to the bottom. With the inversion in temperature the cold water with all the minerals is trapped underneath the warm water, making it unavailable to the phytoplankton who grow near the surface for light. Therefore with less phytoplankton the anchovy will have less to feed on causing a decline in the number of primary consumers such as anchovy which will set off repercussions for the whole food chain. Therefore with less fish in the ocean, the Peruvian fishing industry fails.
