What is this creature?

Question

I found this small creature in my water bucket which i filled from my water tank. I would like to know what kind of creature I have found here.

Features which ought to help for identification:

The triangular "tail" is actually the tail fan made of five parts. The central part of it is the final segment of the body and either side is composed of the two parts of a modified leg. Were you to investigate it more closely you'd thus discover it is not at all "fish like" — Jack Aidley, Mar 9 '16 at 13:51
It looks very similar to the grey shrimps that can be catched on sandy beaches of Normandy (on the English Channel). — bli, Mar 9 '16 at 15:14

David Blomstrom · Accepted Answer · 2016-03-09 13:24:15Z

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It's almost certainly a crustacean of the order Decapoda. The long antennae, fan-like tail and long legs are dead giveaways.

You said you it came from a water tank, so I assume it's a species of freshwater crayfish.

Type "crayfish" into Google images and you'll see lots of pictures, though yours appears to be more translucent.

answered Mar 9 '16 at 13:24

David Blomstrom

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$\begingroup$ The translucence makes me think it's a juvenile stage. $\endgroup$ – Jack Aidley Mar 9 '16 at 13:49

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Maxim Kuleshov · Accepted Answer · 2016-03-09 23:16:50Z

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It looks very similar to freshwater shrimp from this site:

answered Mar 9 '16 at 23:16

Maxim Kuleshov

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$\begingroup$ The tails don't look the same. The tail in the OP's photo is flat across the trailing edge, whereas this shrimp's tail is very irregular. On the other hand, I'm not familiar with freshwater shrimp, and it's possible that there are freshwater shrimp species with crayfish-like tails. $\endgroup$ – David Blomstrom Mar 10 '16 at 0:37

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