TooManyFacts

Ratfish have teeth on their foreheads

https://www.scientificamerican.com/article/this-gloriously-weird-fish-has-teeth-on-its-forehead-for-sex/

Hadal cold-seep methane-based ecosystem

https://www.sustainability-times.com/research/scientists-find-living-creatures-at-31000-feet-discovery-of-deepest-pacific-ocean-life-sparks-unthinkable-survival-debate/

https://www.accuweather.com/en/weather-news/scientists-say-they-cruised-the-ocean-in-a-deep-sea-submersible-and-came-across-an-undiscovered-ecosystem/1804586

Scholarly article

https://www.nature.com/articles/s41586-025-09317-z

Interesting factoid, makes sense but did they study more than one species of fish:

“A recent study has provided the first direct proof that mesopelagic fish, which make up as much as 94 percent of the world’s total fish biomass, release carbonate minerals at rates similar to fish living in shallower waters.”

https://scitechdaily.com/deep-sea-fish-are-secretly-shaping-earths-carbon-cycle/

Paleontology, evolution is the strangest thing, an evolutionarily early fish with suprising findings

https://www.popsci.com/environment/early-fish-jaw-norselaspis/

New Amazon fish species, a vegetarian piranha! Named after Sauron!

https://www.earth.com/news/myloplus-sauron-new-species-of-vegetarian-piranha-with-human-like-teeth/

New limpet species, yahoo summary:

https://www.yahoo.com/news/articles/scientists-shocked-deep-sea-expedition-234000589.html

Report of the limpet, “A new large-sized lepetid limpet from the abyssal northwestern Pacific is the deepest known patellogastropod” 5922 meters

https://zse.pensoft.net/article/156207/

Hammerheads eat other sharks, why?

https://www.mentalfloss.com/animals/fish/why-hammerheads-love-eating-sharks

New faunal barrier

https://www.sciencealert.com/scientists-found-a-mysterious-barrier-in-the-ocean-that-jellyfish-wont-cross

Scientists Found a Mysterious Barrier in The Ocean That Jellyfish Won’t Cross

Nature

03 August 2025

ByMichelle Starr

Scientists Found a Mysterious Barrier in The Ocean That Jellyfish Won't CrossBotrynema brucei ellinorae may look different depending where in the world it lives. (Dhugal Lindsay

Related: There’s an Invisible Line That Animals Don’t Cross. Here’s Why.

Jellyfish with a knob can be found distributed in deep oceans across the world. (Dhugal Lindsay)

Not a single knob-less jellyfish has been found lower than 47 degrees. (Montenegro et al., Deep-Sea Res. I: Oceanogr. Res. Pap., 2025)

The species mostly lives in deep waters. (Dhugal Lindsay)
Northern waters are dominated by knob-less jellyfish. (Dhugal Lindsay)