Which outcome on South American fisheries occurs during an El Niño event, altering ocean currents?

💡 Explanation

When El Niño occurs, weakened trade winds cause reduced upwelling along the South American coast because reduced upwelling of colder water containing more nutrients is suppressed. Therefore, fisheries decline due to lack of nutrients, which is option A, rather than altered salinity, increased oxygen, or decreased algal blooms reflecting other potential but incorrect outcomes.

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