Chronic ocean heating is quietly emptying the sea (and a heatwave can hide it)
Chronic ocean heating is quietly emptying the sea (and a heatwave can hide it) We’re used to hearing about “marine heatwaves” – those headline-grabbing spikes where the sea turns into bathwater and everything with gills starts filing complaints. But a new study suggests the bigger problem is the slow, relentless background warming that never makes the news because it doesn’t look dramatic… until you add up the losses. The researchers analysed 702,037 estimates of biomass change across 33,990 fish populations (1,566 species) from 1993–2021 across major Northern Hemisphere ocean basins. Their key point: if the seabed warms faster , fish biomass falls faster. The headline figure is stark: about a 7.2% decline in fish biomass for every 0.1°C of seabed warming per decade . That’s not “a bit less fish on your plate”. That’s “your grandkids ask what a sprat is.” Heatwaves: the optical illusion in the data Here’s the twist: marine heatwaves can temporarily boost fish biomass in c...