An El Niño is a temporary change in the climate of the Pacific ocean, in the region around the equator. You can see its effects in both the ocean and atmosphere, generally in Northern Hemisphere winter. Typically, the ocean surface warms up by a few degrees celsius. At the same time, the place where hefty thunderstorms occur on the equator moves eastward. Although those might seem like small differences, it nevertheless can have big effects on the world's climate. (from Scripps website).

This change in the Pacific Ocean usually results in very warm water throughout California and should include excellent fishing for warm water offshore species like Yellowfin Tuna and Dorado. In addition, El Nino usually means heavy rains which we desperately need to fill our reservoirs.