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FAQs on Aquatic Insects and Freshwater Aquariums: Ladies and Gentlemen; the Beetles!

Related Articles: Invertebrates in Freshwater Aquariums, Invertebrates for Freshwater Aquariums by Neale Monks,

FAQs on Aquatic Insects:  Aquatic Insects 1, Aquatic Insects 2, Aquatic Insects 3, Aquatic Insects 4, Aquatic Insect Identification, Aquatic Insect Control
FAQs on Aquatic Insects by Group: Dragonflies, Flies in General (Caddis, Gnats, Midges...), Freshwater Mites, Mosquitos/Mozzies and much more!

<12 megs of blurry pix>... Free contaminants w/ live plants  bonus!      9/8/15
Somebody gave me this plant to put in my tank,
<Should have quarantined/isolated; treated prophylactically...>
it has been in there for about a week or two, now there are these bugs, I have one fantail goldfish in my tank, I don't know what they are or what to do if anything, please help, thank you, Lisa
<Do these look summat like Coleopterans to you? See (READ on) WWM re. Bob Fenner>

Re: Alaskan Isopod! One Id down, now on to the Water Beetle! 11/16/07 <Hi Jack!> Thanks for identifying the isopod for us. <You're very welcome!> It is known locally by Inupiat Eskimos as a "toe biter". I doubted they had the ability to bite toes, but perhaps they actually do. <I would imagine so. Those isopods can get relatively large - around 3'. I sure wouldn't want one grabbing hold of my toe!> We have a large(3 cm) water beetle living in the same aquarium as our specimens of Saduria entomon. It preyed upon our snails and is now preying upon the S. entomon. <Ah yes, I see. The predator becomes the prey!> I have had trouble identifying it and hope that you can help. <Hope so> It breathes with head down and stores a large air bubble in its tail region. <Typical> It is quite buoyant and uses a lot of energy to dive. <I've seen videos of this. It looks extremely awkward, and reminds me of trying to see how deep/far I could swim with an inner tube around me as a kid! LOL I didn't do as well as these insects, and I'm very thankful that there are no existing videos to prove it! Regarding identification, unfortunately, insects are not my strong point. What I can tell you is that since it's a predacious diving beetle, it's most likely in the family Dytiscidae. This family, though, has many, many genera and species in it. The good news is that I found the following link that supplies a list, for Alaska, that narrows it down considerably: http://www.uaf.edu/museum/ento/Insect_Omnibus/Dytiscidae/ The next, tedious, step would be to go through that list and look up each specie on the internet. If you do a search based on images, it goes a lot quicker! I looked through about a third of those listed, and saw one that appeared similar - Dytiscus circumcinctus. Here's the link that shows this specie: http://www.hlasek.com/dytiscus_circumcinctus_ac7200.html Problem is, while it looks like yours does have something of a light border around the anterior edges, it doesn't look like it extends all the way around as is shown at the link. If this is indeed the case, then it's back to old drawing board - or in this case: the search engine!> Thanks for any help that you can provide. <You're very welcome, I just wish I could have given you a definitive answer!> Jack Adams White Mountain High School We are located on the Seward Peninsula in Northwestern Alaska. <Indeed a beautiful area, that's a fact! Take care --Lynn>

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