Deep Sea Anglerfish Filmed In Shallow Water Off Spain has been added as a related post - related requested by newtboy on that post.

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D’oh. Another idiotic baseless accusation falls apart when confronted with photographic evidence against the biased (and factually wrong, actually impossible) fantasy by Hersh you jumped on because it looked bad for Biden, not because it made sense or there was any actual evidence…enjoy the photographic evidence of secret Russian deep sea operations at the explosion site just 4 days before the sabotage.

https://www.theguardian.com/world/2023/apr/28/russian-navy-vessel-seen-near-nord-stream-pipelines-days-before-blasts

https://www.upi.com/Top_News/World-News/2023/04/29/Denmark-Russia-Nord-Stream/1621682806486/

https://www.bbc.com/news/world-europe-65461401

Google it when you decide these sources are untrustworthy.

My guess is terrestrial animals use fluorescence more often than bioluminescence as a simpler, less energy intensive, easier to evolve way to glow. Deep sea animals aren’t exposed to very much uv light to make them fluoresce (many shallow water sea creatures do fluoresce, like most coral) so need to produce their own light. Not so with most terrestrial animals.
That could partially explain the difference in frequency.

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But.....Bruhathkayosaurus might have been between 40–44 m (131–144 ft) in length and 175–220 tonnes in weight according to some estimates.
Certain rorquals from the Pliocene possibly rivaled the size of modern blue whales.

https://en.m.wikipedia.org/wiki/Bruhathkayosaurus

It's worth considering there were likely many yet undiscovered large marine animals who either were Chondrichthyes (cartilagenous, no bones) or lived in deep seas where any skeletal remains are still hidden.

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I am curious if the lights used to study these deep sea creatures leave their specimens blind.