Squirt here to talk about bacteria!
Bacteria are microscopic organisms that can thrive in many different types of environments, including our oceans! Bacteria have a bad reputation for making people sick, but they can also be incredibly helpful.
For example; some anglerfish (seen above) cannot produce their own light. Remember, bioluminescence is a chemical process that allows an animal to produce its own light. So how do these anglerfish get their glow? Anglerfish actually borrow their light from bacteria! These tiny bacteria, called Photobacterium, live in the anglerfish's esca, or lure. In exchange the bacteria gains protection and nutrients as the fish swims through the ocean. Pretty neat, huh?
This is also a great example of a symbiotic relationship! A symbiotic relationship is a type of interaction between different species. Sometimes they're beneficial and sometimes they're harmful, but these relationships are essential to many organisms and ecosystems, and they provide a balance that can only be achieved by working together.
Did you know that DEEPEND has a special team that studies these bacteria? Lindsey Freed and Dr.Joe Lopez are working on determining the species of bacteria found on these lures because it turns out that each anglerfish species actually has a unique species of bacterium it's paired with!
No one really knows how many different species of luminescent bacteria there are in total or how these anglerfishes are getting their bacteria in the first place. So far, there are tow different ideas. Either there are bacteria floating around in the ocean waiting to be picked up by the correct anglerfish species, or, these fish are being introduced to this bacteria by their parent during their larval stage (seen below).
Which method do you think anglerfish are collecting their bacteria?