can anyone tell me what this is? (56K warning) - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 02-09-2008, 04:34 PM Thread Starter
 
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can anyone tell me what this is? (56K warning)

I found this wierd invertebrate happily paddling around in a fishtank thats in the final stages of cycling

Its bright green an they vary from about a quarter of one mm to one mm in size.



Anyone know what it is?

Thanks

Marc
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post #2 of 10 (permalink) Old 02-09-2008, 04:43 PM
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It sort of looks like a diving beetle, does it swim in short bursts?
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post #3 of 10 (permalink) Old 02-09-2008, 05:11 PM Thread Starter
 
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Sort of....it almost swims like daphnea, zipping about a little bit, but not indefinately. It seems happy to perch on glass or down in the substrate at the base of my plants.

Ive never heard of microscopic green diving beetles though have you?

Ive caught nearly 10 of them so far and theres plenty more.

As the tank is still cycling im not too bothered. Maybe ill tie some string to one of the naiads I caught and let it go hunting.

It made short work of the 10 I added to its jar earlier....


Marc
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post #4 of 10 (permalink) Old 02-09-2008, 07:15 PM
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Missed the super tiny size the first time around. The only diving beetles I've seen have been much larger, around 1cm long.
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post #5 of 10 (permalink) Old 02-09-2008, 07:21 PM
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Take a look at this thread.

Almost looks like a seed shrimp, except for those little wingy things...

Currently resetting...
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post #6 of 10 (permalink) Old 02-09-2008, 07:48 PM Thread Starter
 
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Hiya,

Already checked that thread out but didnt see anything that matches. Its the wrong shape for a seed shrimp I think and do they come in green?

the wingy things are paddles, almost like on a water boatman.

marc
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post #7 of 10 (permalink) Old 02-10-2008, 06:44 AM
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I think it's a baby corixid, an aquatic bug. But gee he's so tiny and cute! Six legs I presume?
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post #8 of 10 (permalink) Old 02-10-2008, 06:58 AM
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+1 corixid hatchling. aka Water Boatman
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post #9 of 10 (permalink) Old 02-10-2008, 07:57 AM
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It's got to be a boatman, did you get any plants, rocks etc.. from a local pond? Heres a short article on Wiki http://en.wikipedia.org/wiki/Corixidae

I guess they eat plants so beware.

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post #10 of 10 (permalink) Old 02-10-2008, 09:12 AM Thread Starter
 
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Thanks for the repsonses.

Funnily enough my first instinct when saw it was that looks and swims like a water boatman, but then I dismissed it based on the fact that it was way smaller than any water boatmen i knew and bright green.

I guess the green comes from the undigested plant material.

looking at http://bugguide.net/node/view/4964/bgimage

I found this photo:



mine seem to be a little smaller and more transparent (hence the visibility of undigested plant material), but they are probably younger.

The other interesting thing about this is i now know for sure where the dragonfly larvae came from.

I only used one supplier for this new tank and nothing imported from the wild.


Marc
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