Assuming you're not just trolling peopke who care about the environment, I have an actual evidence based answer here, current levels of biomass in the ocean aren't really known, and are difficult to estimate[0]. They're very widely regarded as dropping heavily as a result of human interference and climate change.

I think you might be misreading the comic though, which I think is more an explanation a shifting baseline, where the first panel is compared to the second, rather than the first which would be the correct reference point for a natural population[1].

It's almost certainly not meant to be representative of the actual species, aside from anything else the size ratio between say, pufferfish, turtles and whales are obviously wrong, but again, I don't think the comic is trying to pretend it's accurate in that respect.

[0] https://www.sciencedirect.com/science/article/pii/S0092867419312747#bib8

[1] https://en.m.wikipedia.org/wiki/Shifting_baseline