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Author Topic: Creepy Crawlies  (Read 58272 times)
Corwin
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« on: January 18, 2008, 09:16:51 PM »

ok so its been a while since i have had these *things* in my tank, but with my RCS colony not multyplying like it should i am wondering if these guys may be causing it.

the pictures makem look like worms..but they look like bugs, they have legs, and swim, and their body can curl around like a shrimp, but they have a point instead of a tail, and i can only ever see 4 legs...they remind me a lot of a flea actually..cept they in water. i have two kinds, green ones and clear ones, i am assuming a difference in sexes here? it also has an exoskeleton that is banded/ribbed a bit like shrimp.

-edit- it is *not* a water flea, looked those up already...

can someone help me ID these creepy crawlies, and tell me if they could be responsible for no new baby shrimps (seeing as i always have 3-4 berried RCS at a time..and its been almost 2 months since ive seen the first berried one).



i think i first started seeing them when i got my hornwort and anacharis from a local nursery ^ ^
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« Reply #1 on: January 18, 2008, 10:21:33 PM »

Freshwater copepods is my guess.  Harmless food items.
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Corwin
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« Reply #2 on: January 18, 2008, 10:33:19 PM »

hoots, they are 5mm long..i thought copepods only got to be 1-2mm max?

i dunno, your guess is better than any of mine so far ^ ^
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« Reply #3 on: January 18, 2008, 10:56:16 PM »

I think your little dudes may be Gammarus pseudolimnaeus.  That would make it an amphipod which are bigger than copepods.
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Corwin
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« Reply #4 on: January 18, 2008, 11:30:45 PM »

hmm looked those guys up didn't find much, but they look a *Lot* like all the 'gammarus' (no subname) pics ive been able to find ^ ^ could be them lol ^ ^ thanks a lot hoots, this is the closest ive been able to find Smiley it looks like teeny green/white ones of the gammarus species..most pics i seen are brown ^ ^ but may well be another species Smiley
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Karen
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« Reply #5 on: January 19, 2008, 08:47:50 AM »

Look like scuds to me (fresh water amphipods).  They come in a zillion species and can actually get to be quite large.

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Corwin
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« Reply #6 on: January 19, 2008, 11:11:13 AM »

thats them allright ^ ^

do they pose any danger to anything?
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mduros
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« Reply #7 on: January 19, 2008, 11:12:53 AM »

I don't think they do Corwin.  You have some new pets...  biggrin
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Mary.
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Karen
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« Reply #8 on: January 19, 2008, 11:54:56 AM »

They are most likely the reason your shrimp are no longer breeding successfully though.  They probably eat shrimp eggs.
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Corwin
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« Reply #9 on: January 19, 2008, 12:26:29 PM »

how do they manage that? Cherry red Shrimp carry their eggs with themselves till birth, and the fry are benthic (miniuature shrimp)? i can understand ghost shrimp as those have larvae for a few days..but RCS?

if they are the cause however..how do i get rid of them?
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mduros
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« Reply #10 on: January 19, 2008, 06:40:12 PM »

I didn't find anything talking about what they eat, just what to feed them to...  I would think that Karen would know better than the rest of us.  But for what it's worth I didn't see anything talking about possible hazards of having them in your tank.
Take care,
Mary.
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VĭиŏиMăĭ₣
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« Reply #11 on: January 19, 2008, 07:50:50 PM »

They look really cool, send some to me.  proud
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Karen
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« Reply #12 on: January 19, 2008, 08:14:53 PM »

They are mostly carnivorous.  They eat zooplankton, which your shrimp eggs qualify as.  How they are eating them with Mom trying to guard them is out side of my knowledge.
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RTR...Grumpy Ole Fogie
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« Reply #13 on: January 19, 2008, 11:48:20 PM »

Female shrimp don't 'guard" the eggs as some fish do, they are attached to her swimmerets, aka pleopods.  To get the eggs, the female must be eaten herself.
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Corwin
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« Reply #14 on: January 20, 2008, 12:35:22 AM »

RTR that means these guys (amphropods/scuds) can't eat the eggs right? (i always ask redundant questions sorry, but i like to know *for sure*

would they eat the baby shrimp however?

vinson, i would if i could, i have no way to catch them, they hide *in* the substrate when i try. however i know of a bigger scud (.5-1 inch or so) that you can find from hobbyists who breed/keep them on purpose
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RTR...Grumpy Ole Fogie
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« Reply #15 on: January 20, 2008, 09:44:09 AM »

SFAIK, scuds are primarily scavengers - but certainly eat tiny lifeforms.  Size is everything - if the baby shrimp are in the right size range, they could be eaten.  The eggs are protected, the babies are not.  They don't like light, so are harder to see/capture in a lighted tank.  Any predator that could and would eat the scuds will do the same for the shrimp.
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Corwin
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« Reply #16 on: January 20, 2008, 02:51:28 PM »

thanks RTR it would explain the shrimps being ever-berried but rarely seeing baby shrimp...i think what i'll do is when my sis gets her 10 gal i will move all the shrimp in that one (only the shrimp..and filter of course), then give her my old one so she can have the amphipods and w/e fish she gets can eat them and have a good snack...then i will have a snail-less, amphipod-less tank with just RCS in it!

i have counted at times 20+ of these scud things..but they always going in/out of the substrate so i bet its like MTS, i have a few 100 w/out seeing it lol
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Gopi
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« Reply #17 on: January 20, 2008, 04:47:45 PM »

What if they are in the filter too? That's a nice dark place to hide... Just a thought...
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Corwin
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« Reply #18 on: January 20, 2008, 08:12:04 PM »

What if they are in the filter too? That's a nice dark place to hide... Just a thought...

my filter intake has a sponge wrapped around it so nothing can get into it (i hope) i did this hoping i would not hack baby shrimp to pieces....this gets me wondering though:

which of the two sponges has the bacteria, the one on the intake or the one in the filter?
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« Reply #19 on: January 20, 2008, 08:20:40 PM »

both will probably have some.
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