New research reveals how rising temperatures are shrinking fish populations across the Northern Hemisphere.

Scientists tracked 33,990 fish populations over 30 years to understand the impact of a warming world.

Gradual warming over decades has led to an annual biomass decline of nearly 20% in some areas.

Sudden heatwaves cause even faster changes than gradual warming, creating immediate winners and losers.

Fish living in the coldest parts of their range actually thrive when the water warms up temporarily.

Populations already at their heat limit suffer massive losses—up to 43%—during intense heatwaves.

Warm years cause fish to flourish in the north while disappearing from the south, shifting the whole ecosystem.

Temporary increases in fish numbers can lead to overfishing if we don't realize they are just passing through.

We must plan for long-term losses while being smart about short-term booms to protect our food source.

Understanding these patterns is the first step in saving our oceans from extreme heat.

Data helps us navigate the warming waters. Stay informed to help preserve marine life for all.