Jump to content

Red cherries missing a plate or a portion of their shell on the front left hand side?


Recommended Posts

Hi everyone - I've been keeping RCS for about a year. Went away for three months and left them with a friend, came back and they had seriously multiplied! Lots of fun, but I've noticed that three (maybe more but at least three) of the females appear to have a piece of their shell missing. All on their lower front (where their front legs join their body), all on left hand side - it either looks like there is a plate missing or a plate that is shorter than it's meant to be. Is this a genetic defect or is there something environmental at play? All the affected shrimp that I can see are almost adult size, so they would have grown up from tiny babies in this same tank. They seem to be doing totally fine, but it would be good to know if this is genetic so I can put them in a different tank. Thoughts? Picture attached! Thanks so much, xoxo

Screen Shot 2022-04-14 at 16.03.06.png

  • Confused 1
Link to comment
Share on other sites

Do you have the water parameters for that tank? I would normally think it is a molting issue but to have several all the exact same seems to indicate otherwise. Is the shell missing or is it just clear in that area (picture a bit low quality to be able to see clearly, it looks like there is a clear area of shell though)?

Welcome to the forum!

  • Like 1
Link to comment
Share on other sites

This is a result of a bad moulting. Usually cause by incorrect water parameters and made it particularly difficult for the shrimp to moult easily. If the shrimps were not in this condition before, than that's the cause.

The carapace (or shell) is clear and transparent. Underneath the carapace is a thin soft layer of "skin". It is this layer of skin that has the colouration we see. It looks like the skin has been pulled up during the moulting process, as the shrimp struggled to get out of the old carapace.

She should live a normal life, but it's not going to win any beauty contests.


Check on your GH, and start reducing GH slowly over a few water changes.

Edited by jayc
  • Like 1
Link to comment
Share on other sites

  • 3 weeks later...

Hi thank you guys for your replies, really useful!

I had a look and I think my GH is slightly a bit too high (about 150 mg/l). My KH is is around 120 mg/l so I think that is also too high. 

I had another shrimp die from moulting problems (white ring of death style) this week. So I will be taking steps to slowly reduce both GH and KH over my next water changes. 

Thanks again! 

  • Like 2
Link to comment
Share on other sites

5 hours ago, Shrimpmamaxoxo said:

So I will be taking steps to slowly reduce both GH and KH over my next water changes. 


  • Like 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Join Our Community!

    Register today, ask questions and share your shrimp and fish tank experiences with us!

  • Must Read SKF Articles

  • Posts

    • jayc
      Welcome to SKFA. It's a Macrobrachium of some sort. Those claws give it away. But don't know which exact species of Macrobrachium. Might be able to narrow it down to which species if we knew where the shipment was from. Where are you from?   Don't put this fella in a tank with other Neo Caridina or Caridina or Taiwan bee shrimps. It will eat those smaller shrimp.
    • JLRiggs73110
      Hey all! First of all, thanks for the add!  I really appreciate it!  I hope I am not breaking any rules by posting this in this thread, so if I am, please relocate this post to where it belongs!!  So, about a week or so ago I got a blue crayfish from the local pet store, and they told me that this "Little Dude" (His name!) was sent along with that shipment in error and it wasn't identified, or at least the pet store didn't know what it was, or told me it was another type of crayfish.  After his first molt (Just last night and the fastest to complete one yet) he is a different color, slightly bigger, and I don't think he is a crayfish at all.  I am thinking he is a shrimp, but I am not sure.  If someone could confirm this for me, and possibly even identify what species of shrimp it is, that would be amazing!!  Please don't judge the dirty tank I have been working and then he molted so I haven't had a chance to clean it properly in a little bit.  I appreciate the help!
    • sdlTBfanUK
      Great news that everything seems to have settled down! When you do set up a new folter system, leave the old sponge in the tank for a couple of weeks while new one is running as it will be full of bacteria but the new one won't have any at the start etc!
    • alkemist
      It's been awhile but things have been going ok. I got my water parameters back to around where it needs to be. KH back to 4 but I can't seem to increase GH past 5, even if I only add GH remineralizer back during a water change. Anyhow, the tank has been stable. I haven't seen many shrimp deaths or anything alarming. They are still consistently breeding. I do have to feed them much more aggressively, on a daily basis. I also started to add in mulberry and dandelion leaves for them to graze on every few days on top of the other foods. They are a bunch of hungry buggers. I need to swap to a more powerful filtration system than a sponge filter system. While the shrimp poop is awesome for growing my plants, the water has become dank and dark. I'm fine with tannins, but there are way too many particulates in the water. Going to swap to a mini canister filter system with a spin pipe to keep water flow low.. so things are going to get shook up a bit again, but hopefully it all stays stable.
    • Don 78
      Simon, Thanks for your input. I will recheck my water parameters. Don
  • Create New...