Microscopy Thread

[EnterName]

Post #51 shows a hydroid in its medusa form (jellyfish-like).
I was fortunate enough to find a different hydroid form in my tank today. Usually it is impossible to find these things in older tanks, but since I have upgraded tanks these things pop up again.

You might have seen these white or transparent tentacles in your tank. They like to attach to reef rock and irritate corals:

(Semi-Transparent "tentacle" moving in the current)
​

Bulkreefsupply has a better image which they attribute to Reef2Reef, but I did not find the original source yet.

(The very same tentacle under a microscope)​

 

[ISpeakForTheSeas]

Certainly not the most impressive image, but I feel like documenting different algae types is a decent idea so people can compare what they have found on their live rock. This is a piece of macro algae (Halymenia durvillei to be specific). It's a quite nice looking red macro algae that is growing in my sump. As my tank has very low nutrient levels I don't really need macro algae, but I'm keeping this one because it looks nice.

(Branched Halymenia - Halymenia durvillei - "Dragon's breath")​

I'm always a fan of this sort of documentation (even with species that the documentation already exists for); it's a lot of work, but I always appreciate when I find sites or studies with pics of a species at a few different levels of closeness: like one of the full algae; one of a single "leaf" of the algae; one of any macroscopic specific unusual features common to the species; general microscopic features; specific microscopic features, etc.

 

[EnterName]

Certainly not the most impressive image, but I feel like documenting different algae types is a decent idea so people can compare what they have found on their live rock. This is a piece of macro algae (Halymenia durvillei to be specific). It's a quite nice looking red macro algae that is growing in my sump. As my tank has very low nutrient levels I don't really need macro algae, but I'm keeping this one because it looks nice.

(Branched Halymenia - Halymenia durvillei - "Dragon's breath")​

I'm always a fan of this sort of documentation (even with species that the documentation already exists for); it's a lot of work, but I always appreciate when I find sites or studies with pics of a species at a few different levels of closeness: like one of the full algae; one of a single "leaf" of the algae; one of any macroscopic specific unusual features common to the species; general microscopic features; specific microscopic features, etc.

Thank you,

I'm aware that I'm not doing anything new or of actual scientific value here, but I think posts like the "common hitchhiker guide" or "dinoflagellate identification guide" are more accessible to reef keepers than studies or huge books (often behind paywalls) for which you already have to know what you are looking at in order to find what you just discovered in your tank.

Maybe some day I can summarize this thread into a guide as well. I would be really happy if people started using my images for identification purposes just like the hitchhiker and dinoflagellate guide

Maybe I should include bright-field images for every post as DIC won't be available to most

 

[Alexraptor]

Cool thread! The sharpest microscope image I've managed to capture, is one of this polychaete-larvae that was swarming in one of my tanks, a few years ago. No idea what it actually is.

 

[sixty_reefer]

Thank you,

I'm aware that I'm not doing anything new or of actual scientific value here, but I think posts like the "common hitchhiker guide" or "dinoflagellate identification guide" are more accessible to reef keepers than studies or huge books (often behind paywalls) for which you already have to know what you are looking at in order to find what you just discovered in your tank.

Maybe some day I can summarize this thread into a guide as well. I would be really happy if people started using my images for identification purposes just like the hitchhiker and dinoflagellate guide

Maybe I should include bright-field images for every post as DIC won't be available to most

I actually think including both would make it even more useful. DIC images are fantastic for revealing detail but having the corresponding bright field image gives people something they can realistically compare with what they see through a standard microscope.

 

[EnterName]

Thank you,

I'm aware that I'm not doing anything new or of actual scientific value here, but I think posts like the "common hitchhiker guide" or "dinoflagellate identification guide" are more accessible to reef keepers than studies or huge books (often behind paywalls) for which you already have to know what you are looking at in order to find what you just discovered in your tank.

Maybe some day I can summarize this thread into a guide as well. I would be really happy if people started using my images for identification purposes just like the hitchhiker and dinoflagellate guide

Maybe I should include bright-field images for every post as DIC won't be available to most

I actually think including both would make it even more useful. DIC images are fantastic for revealing detail but having the corresponding bright field image gives people something they can realistically compare with what they see through a standard microscope.

Yes, if I post bright-field images I most certainly will still include DIC. It just looks so much better

 

[ISpeakForTheSeas]

Thank you,

I'm aware that I'm not doing anything new or of actual scientific value here, but I think posts like the "common hitchhiker guide" or "dinoflagellate identification guide" are more accessible to reef keepers than studies or huge books (often behind paywalls) for which you already have to know what you are looking at in order to find what you just discovered in your tank.

Maybe some day I can summarize this thread into a guide as well. I would be really happy if people started using my images for identification purposes just like the hitchhiker and dinoflagellate guide

Maybe I should include bright-field images for every post as DIC won't be available to most

Definitely agree on the accessibility; guides in layman's terms are a lot easier to use than taxonomic keys (which can be tough to find) even when you know how to read them (and learning how to read them for various critters can be an exercise in perseverance at times).

Personally, I'd say the more the pics the better, but don't try to do more than you're up for!

 

[EnterName]

Today I decided to take a closer look at some ball sponges that are quite numerous in my tank. They are relatively common but I rarely see them on this forum. Most people are asking about pineapple sponges which I might be able to dissect in another post. Both sponge types are harmless and beneficial. If you feed phytoplankton you can see them turning green from all the plankton they filter out of the water.

(Various Ball sponges on reef rock, probably Tethya spp.?)
​

These sponges are common hitchhikers that reproduce by "budding" a process that (in simplified terms) means they are growing small versions of themselves on their own body and release them into the water once large enough.

(Ball sponge during the "budding" process)

(Full view of a bud in Darkfield at approx. 100x magnification)​

To support their structure and not just be a round blob of jelly these sponges form silica based spicules which are these needle-like structures. You are basically looking at its "bones".

(Close up of the bud's spicules at roughly 400x magnification coming out of the sponge's sides.)​

 

[EnterName]

Maybe a bit less interesting than the previously posted Ball sponge, but still important for this thread:
Sea lettuce (Ulva sp. or Ulvaria sp., I assume it's Ulva lactuca also known as Ulva fasciata but I'm not sure)

I don't have much algae growth in my tank, but during my recent tank upgrade I damaged a small part of my Stylophora pistillata. The small section grew a tiny bit of this algae, probably as the decaying coral tissue allowed for the accumulation of amino acids and other nutrients.

(Algae cells under approx. 400x magnification)​

Julian Sprung writes in his booklet "Algae A Problem Solver Guide": This algae is "Very palatable to most herbivorous fishes." My Yellow tang agrees with him . It's usually relatively easy to remove and control compared to other green algae and needs a lot of light to grow. Most flow pumps/gyres are located quite high in a tank and get a lot of light which unfortunately makes them a perfect place for Ulva to grow and negatively impact the pump's output.