SGU Science Picture Of The Week: Squid Aliens
No, this is not an image of aliens with some weird bio-luminescent bacterial infestation.
These are juvenile squid (Longfin Inshore) that have been stained to reveal certain biological structures. The red stain reveals the musculature of the mantle (which looks like an unusual hat). The green stain shows the cilia that cover the body at this stage of development.
This image was created by Zeiss Microscopy. This company offers a wide range of microscopes for sale for research or education from those using plain visible light to those using lasers, electrons or X-Rays.
Stains and dyes have long been used in biological imaging to increase the contrast of parts of cells, organisms, etc. to distinguish them from the myriad of other structures also caught by the microscopes. This is similar to the filters used in astrophotography to bring out the specific details of nebulae, the sun, or whatever astronomers may be interested in.