Beyond the Golden Gate Oceanography Geology Biology And Environmental Issue
Beyond the Golden Gate Oceanography Geology Biology And Environmental Issue
Geological Survey Us
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The follow- ing February, the next year's 3-year-old chinook salmon begin to enter into the gulf, and the cycle begins again. During strong El Nino years, the normal sequences of chinook salmon prey do not develop because the large increase in ocean temperature disrupts the prey's normal behavior. As a result, the aggrega- tions of salmon that feed on these prey do not form, and chinook salmon of a given length weigh much less than normal. California's commercial salmon catch also drops severel...y, and the recreational catch is far below average. 42 Biology and Ecological Niches in the Gulf of the Farallones 12300'W 12230' 3800'N - SAN 1-RANCISCO * 3730' A Chinook salmon (Oncorhynchus tshawytcha). Most chinook salmon found in the Gulf of the Farallones are 3-year-old fish that are returning from the open ocean and preparing to enter the Sacramento River system, where they will spawn and then die. (Photograph from U. S. Food and Drug Administration. ) As shown in this simplified diagram, 3-year-old chinook salmon return- ing from the open ocean move into the Gulf of the Farallones in February and March and feed on Pacific herring and anchovies off the Golden Gate from Bolinas Point in the north to Point San Pedro in the south.
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