The mystery in the depth.
Oceans are full of mysteries. Why do sharks, tunas, and some other big sea predators dive very deep? Sometimes researchers introduced theories that they would dive to those depths because of easy food. The idea would be that those deep or those leap-layer fishes don't recognize those predators. That would give them a surprising momentum against their prey.
The idea is that high pressure will press some dirt or metabolites from the blood vessels. And that helps those fishes keep their blood vessels young. And in some other models, the shark or some other creature shows that it will not have any genetic disorders. Because those deep-diving individuals have bones that can resist the water pressure.
"New research using electronic tags and sonar data shows that large marine predators like sharks and tunas often dive into the deep mesopelagic zone, interacting with its dense layer of organisms for feeding and possibly other purposes. This zone is crucial for both ecological balance and commercial fishing, requiring careful study and conservation to prevent irreversible damage". (ScitechDaily.com/Unveiling the Mysteries: New Insights on Why Marine Predators Dive Into the Dark, Deep Sea)
That thing makes them good subjects for mating. In that model, the high water pressure would launch some kind of hormones that can tell the predicted mate that the individual is capable of making descendants with it. The deep diving behavior is a very interesting thing. And if researchers can calculate how many individuals make those deep dives? Does that tradition belong to the entire group? Or do only a few individuals participate in that thing?
The next thing is interesting theory but confirmation is a very difficult thing.
There are interesting tales about creatures that can change their form. and the fact is that we don't know how pressure affects fish. In some theories, some fishes can have a life cycle in that they will spend their entire life in surface or deep sea layers. When surface living fish makes its eggs.
Those cubs will dive into the deep sea. And then the cubs of those creatures will rise to the surface. That thing should deny the genetic materials cumulation. The fact is that we don't know such species. But that thing denies fertilization with straight ancestors. And that separates two populations from each other.
https://scitechdaily.com/unveiling-the-mysteries-new-insights-on-why-marine-predators-dive-into-the-dark-deep-sea/
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