I've seen this claim multiple times and I don't believe it. It seems to be based on a single study where researchers sampled one small part of the ocean and the

I've seen this claim multiple times and I don't believe it. It seems to be based on a single study where researchers sampled one small part of the ocean and then extrapolated wildly. Multiple sources also claim that there are around 3 trillion fish in the world in total. How exactly do you reconcile that?