Which effect typically occurs in coastal Peruvian fisheries during prolonged El Niño events?

💡 Explanation

During El Niño, trade winds weaken, causing thermocline deepening and reducing nutrient-rich upwelling because density differences stabilize the water column, suppressing vertical mixing. Therefore reduced upwelling harms fisheries, rather than salinity changes, predator migrations, or nutrient stimulation which rely on different oceanic dynamics.

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