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Ocean currents influence marine ecosystems and fisheries worldwide.
Description
Ocean Currents and Fish Distribution
Ocean currents can be broadly categorized as warm or cold. Warm currents flow from equatorial regions toward the poles, while cold currents flow from polar regions toward the equator. Shallow water fish populations are mainly found on continental shelves. Cold currents bring nutrient-rich waters that support abundant fish populations. The El Niño Southern Oscillation (ENSO) is a periodic warming of surface waters in the eastern Pacific Ocean that disrupts normal ocean currents and reduces fish populations along the Pacific coast of South America.
- a[2]
Outline the general locations of significant ocean currents and their temperature characteristics.
Aim for approximately 2 distinct marking points.
- b[4]
Explain how ENSO affects fisheries along the Pacific coast of South America.
Aim for approximately 4 distinct marking points.
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