These two pictures are examples of an el nino. The red and white represent high temperatures and the blue and purple resemble the low temperatures.
When the temperatures are warmer, this has a postitive effect on fishers because when the temperature is warmer the bigger the fish population.
Sources:
-http://www.pmel.noaa.gov/toa/elnino/el-nino-story.html
-http://www.weathersa.co.za/Refrences/elnino_ENSO2.jpg
-http://www.woodrow.org/teachers/esi/1997/02/UOPtorch/S_Digby/ElNino_p49380.jpg