Well i was just out kayaking around at low tide in Pleasant bay in Cape cod at low tide. I came across a shrimp that i have only caught once before called a mud shrimp. I dont know alot about them but i do know they burrow. I couldn't find much information online and i was hoping someone on here would have some info on them. Anyway i have him in my fifty gallon coldwater in a lemonade bottle with small holes cut through it to keep it from being lunch for my flounder, bluefish, or grouper. Pics later for the tank, its current inhabitants, and and the shrimp.

http://www.nwmarinelife.com/htmlswimmers/u_pugettensis.html

Is this it? If so they are filter feeders and build tunnels in the mud for protection.

That's it actually. Thanks.

I would not recommend letting it out of the bottle. I had one, but everything in my tank really wanted to eat it. so they did. Which is probably what will happen in your case unless you have lot of fine sediment for it to burrow in. PVC pipe may also work.

Haha, that's kinda funny. But a little sad at the same time Anyway, mine died awhile a go for the same reason yours did. Mr Fluke thought it looked tasty.