Summary

Ocean fish stocks have been increasingly exploited over time, and remote sensing shows they have declined in the open ocean over the last three decades, particularly in the tropics. But it's uncertain how fish populations will fare in the future, as climate models show both increases and decreases in global trends by the end of this century. Climate change, warmer oceans, ocean acidification, weakened upwelling and increasing ocean stratification all play a part in determining the trend.

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