FAQs about Gammarid
Related FAQs: Micro-Crustaceans, Microcrustacean Identification, Microcrustacean Behavior, Microcrustacean Compatibility, Microcrustacean Selection, Microcrustacean Systems, Microcrustacean Feeding, Microcrustacean Disease, Microcrustacean
Reproduction/Culture, Amphipods, Mysids, Hermit
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Eating Shrimp, Refugiums, Crustacean Identification,
Crustacean Selection, Crustacean Behavior, Crustacean Compatibility, Crustacean Systems, Crustacean Feeding, Crustacean Disease, Crustacean Reproduction,
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Nutritious By Adelaide Rhodes,
Ph.D, Copepods, Crustaceans,
Amphipods, Mysids, Isopods,
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Shrimp, P. holthuisi
Crabs, Squat Lobsters, Crabs, Arthropods,
Pycnogonids (Sea Spiders),
Can Gammaridean amphipoda keep at 82F?
<Many species can, yes, along with most everything else marine we
commonly keep. Please read on WWM re, or search for works by Ron Shimek
on the web.
Mystery Bug: Gammaridean Amphipod and Disappearing
Zoanthids - 7/19/09
<Hi y'all, Lynn here today.>
We're wondering if you can help identify the mystery bug in
the enclosed photos.
<Yep, it's a harmless Gammaridean amphipod, also known as
a scud or Gammarid.>
We have a 30 gallon salt water tank that is about a year old.
We've been having some problems with our Zoas (they're
disappearing a little at a time as if being eaten) and took them
out for a Lugol's dip. This guy was one of the unfortunate
victims that came out. Is this a type of copepod?
<Nope. While they're both crustaceans, Gammarids are in
the order Amphipoda while Copepods are in the order Copepoda. For
more information on Gammarids, please see the following link:
Is he anything that would eat a Zoa?
<I doubt that he'd eat a healthy Zoanthid, but he could
potentially eat dying tissue left by a predator. Gammarids can
and do however, sometimes act as Zoanthid 'irritators'
due to their grazing and foraging habits. Some Zoanthids simply
don't like all that contact and react by keeping their polyps
closed for extended periods of time. If your Zoanthids are
opening as usual, but simply disappearing, I'd look for the
usual suspects: Heliacus/sundial snails, Aeolid Nudibranchs,
hydroids, etc. Please see the following links for photos and more
I'd also recommend checking the remaining Zoanthids for any
sign of small light/whitish spots. If so, it could be what some
hobbyists call Zoanthid pox. Please see this link for a photo
For treatment, see the first FAQ, titled 'Zoa Pox Treatment
-- 05/09/09' at this link:
More info here regarding diagnosis/treatment:
Thanks for the help,
<You're very welcome and good luck!>
Pegine and William
<Take care, LynnZ>