"Warming water temperatures lower water oxygen levels, putting embryos and pregnant fish at risk, researchers say"
"Sixty per cent of studied fish species will be unable to survive in their current ranges by 2100 if climate warming reaches a worst-case scenario of 4-5C (7.2-9F) above pre-industrial temperatures, researchers have found.
In a study of nearly 700 fresh and saltwater fish species, researchers examined how warming water temperatures lower water oxygen levels, putting embryos and pregnant fish at risk.
“A 1.5C increase is already a challenge to some, and if we let global warming persist, it can get much worse,” said Hans-Otto Pörtner, a climatologist who co-authored the study published in the journal Science.
The world is already more than 1C hotter than before industrialization, and it is on track to be about 3C hotter."