Mud Crabs Have Arrived ,Rropanopeus harrisii, Now with Eggs - Page 9 - The Planted Tank Forum

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post #121 of 195 (permalink) Old 01-27-2013, 02:17 AM
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Mud Crabs Have Arrived --- Rhithropanopeus harrisii

They definitely are. Those are guaranteed shrimp safe. Their bodies should be little more than the diameter of a pencil eraser

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post #122 of 195 (permalink) Old 01-27-2013, 02:19 AM Thread Starter
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I didn't realize that Thai crabs were that small. The body of the mud crabs is around 2-3 pencil erasers.

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post #123 of 195 (permalink) Old 01-27-2013, 02:21 AM
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Mud Crabs Have Arrived --- Rhithropanopeus harrisii

Yeah. So if Rob's crabs aren't 1-2 pencil erasers small, they may not be Thais. But I've read so much on them, and while their coloration can fluctuate, they look very much like that.

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post #124 of 195 (permalink) Old 01-27-2013, 02:25 AM Thread Starter
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I amend that statement they look like more 1-2 in body, but the legs look thicker than thai crabs. Also the thai crabs have more curved pincer arms whereas the mud crabs are more of the more regular crab shaped pincer arms .

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post #125 of 195 (permalink) Old 01-27-2013, 02:28 AM
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Mud Crabs Have Arrived --- Rhithropanopeus harrisii

Ahhhh yeah. The body is how I often read their size measured.

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post #126 of 195 (permalink) Old 01-27-2013, 02:34 AM Thread Starter
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I think the biggest difference is size and how the pincers are positioned. The thai micro crabs seem to have smaller pincers and hold them folded underneath the body. With the mud crabs they seem to have bigger pincers and hold them out in front.

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post #127 of 195 (permalink) Old 01-27-2013, 02:39 AM Thread Starter
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I have been noticing empty shell snails, but I attributed it to being there before I put the crabs. So yesterday I put some more Rams snails of different sizes into the tank. I just noticed that there is a snail shell that looks broken with a dead snail partial in it. It could be that I smashed a snail on accident when transferring them. I guess I will need to see if more empty shells show up.

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post #128 of 195 (permalink) Old 01-27-2013, 02:46 AM
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Re: Mud Crabs Have Arrived --- Rhithropanopeus harrisii

Here's an update (Hope you don't mind!) These guys are very hairy this one on his side keeping at least one "toe" out of the water. I put a small amount of spirulina in the tank, thinking he's catching it.

Turns out there is one male and two females.
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post #129 of 195 (permalink) Old 01-27-2013, 02:49 AM
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Re: Mud Crabs Have Arrived --- Rhithropanopeus harrisii

They are definitely smaller than two erasers across. Much closer to one. :-)

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post #130 of 195 (permalink) Old 01-27-2013, 02:54 AM
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Those are so cool!

please check out my 5x nano tank setup:
http://www.plantedtank.net/forums/sh...d.php?t=191287
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post #131 of 195 (permalink) Old 01-27-2013, 03:00 AM Thread Starter
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Yea those are Thai micros. They were what I was originally going to get for the tank until someone else started the thread about the mud crabs. According to some of the articles, on mud crabs, they can and do have a full life cycle in fw bodies of water. Hopefully it can be repeated in the aquarium setting. If i remember correctly Thais also can do a full life cycle in fw but no one has been able to repeat the process in the aquarium.

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post #132 of 195 (permalink) Old 01-27-2013, 03:08 AM
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Mud Crabs Have Arrived --- Rhithropanopeus harrisii

Thais do have a full cycle in fresh. We just haven't figured out how.

They are Thai, Rob. They feed by catching particles in their hairs and eating them.

I started the thread on mud crabs because I'd never seen them before anywhere, let alone on eBay.

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post #133 of 195 (permalink) Old 01-27-2013, 03:36 AM
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Re: Mud Crabs Have Arrived --- Rhithropanopeus harrisii

I do like your mud crabs, they're very cute!

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post #134 of 195 (permalink) Old 01-30-2013, 01:43 PM Thread Starter
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One of my crabs is bigger than the rest. Not sure if it is a female and the others are male because it looks bigger. I wasn't able to get pictures of it to show size reference. All the pics I have so far are of the smaller crabs.

More pics.




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-Doug

Last edited by dougolasjr; 01-30-2013 at 01:44 PM. Reason: adding
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post #135 of 195 (permalink) Old 01-30-2013, 02:03 PM
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Re: Mud Crabs Have Arrived --- Rhithropanopeus harrisii

Doug... Crabs are easy to sex. If you can see their undersides. Males have a much narrower "apron" than females.

The apron is like a tail folded under their bodies, is where the female carries the eggs.

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