It's one of LEO und friends' shorter series, clocking in at two cycles and 7 books total. The basic premise involves a post-apoc civilisation, one in which white people interestingly find themselves in the minority, with darker-skinned people running the show for the most part.
https://www.bedetheque.com/media/Planches/PlancheS_35328.jpg
Police inspector Romane, one of our two leads, is a skinny white gal, not taken very seriously by her colleagues, yet she's got a great nose for sniffing out inconvenient facts. She's assigned work with Ibrahim, a Middle-Eastern colonel in the UN Forces. Later, they and their little team go up against almost impossible odds against a giant, multinational corporation whose aim in this case is the conduct of genetic experiments designed to produce human-cetacean hybrids, specifically in order to better take advantage of Earth's rising sea levels.
https://www.bedetheque.com/serie-35328-BD-Mermaid-Project.html
In fact I'm re-reading cycle two right now, called Mutations, in which Romane & her now-boyfriend 'Brahim' have predictably been screwed over by governmental-corporate interests as the two-book series opens, stripped of their jobs and titles until the ~~morons~~ er, powers that be gain a clue, and bring them back on board to address a new threat... one in which an outside agency is using weapons and mind-control to attack the various fishing vessels largely sustaining what's left of humanity.
Er, I'll be honest... the whole reason for this post originated from the fact that I found the doggos' facial expressions in panel 1 so dang amusing, as compared to the overall gravity of the situation. XD
Seriously, though-- this is quite a solid series, containing lots of thought-provoking fare. Biggest nitpick is that it didn't quite have the stupendous windup in tome 7 that I was emotionally hoping for, but... life's like that, sometimes, mais non?
Just to be clear-- if you're not interested in issues such as sustainability, animal rights, the defeat of fascism and so forth, this series might just be a 'dud' for you.