Dragonfly Nymph in my filter - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 07-10-2013, 01:26 AM Thread Starter
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Dragonfly Nymph in my filter

Today I happened upon what looks like a dragonfly nymph in my filter. I have no idea how it got there or what it's been doing. All of my fish are fine. I have read that dragonfly nymphs can be deadly to fish and shrimp so I took it out immediately but I don't know if this means I have an infestation and should thoroughly comb my tank to get rid of them.


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post #2 of 10 (permalink) Old 07-10-2013, 01:41 AM
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post #3 of 10 (permalink) Old 07-10-2013, 02:36 AM Thread Starter
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What is the best way to get rid of them?
I have denison barbs and a black ghost knife in the tank. Will they eat the dragonfly nymphs or be preyed upon?

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Last edited by Himmer14; 07-10-2013 at 03:15 AM. Reason: more questions
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post #4 of 10 (permalink) Old 07-10-2013, 06:56 AM
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although dragonfly nymphs look similar, that is a mayfly nymph (i'm sure-dragonfly nymphs dont have a forked tail and mayfly ones do). I don't know if they affect fish though
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post #5 of 10 (permalink) Old 07-10-2013, 07:09 AM
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that is not a dragonfly nor a mayfly nymph, trust me I am an avid flyfisherman, what you have found is a damsel fly nymph, perfectly harmless and nothing to worry about.

In fact I have one of my tanks that I commonly bring back nymphs and scuds from many of the lakes I fish and add them to it, some of my lake creatures get eaten but what survives will live till it emerges to an adult and flies throught my house for the cats to play with
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post #6 of 10 (permalink) Old 07-10-2013, 07:31 AM Thread Starter
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Thank you so much for the clarification. I'm very relieved that it is a damselfly nymph.

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post #7 of 10 (permalink) Old 07-10-2013, 02:56 PM
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The appendages on the back end (kind of like a tail, but they are actually gills) makes it a bit easier to tell the difference between damselfly & dragonfly nymphs. Damselfly nymphs have only 3 appendages (soft) on the back end. They usually have long, slender bodies. Dragonfly nymphs have 5 stiff appendages on the back end, and usually have bulkier bodies.

I wouldn't say they are absolutely harmless. They are predators, and they are experts at hiding in plants. Unfortunately, they can stay in the nymph form for quite some time before transforming into an adult fly. I had a couple bad experiences with damselfly nymphs that managed to somehow get inside a couple of my shrimp tanks (heavily planted). They really did a number on my shrimp colonies (populations dwindled down quickly). As far as removal: physically removing them worked best for me, but it can be a slow and painful task if your tank is heavily planted.
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post #8 of 10 (permalink) Old 07-10-2013, 03:02 PM
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dragon-



fly-
eats Lesser water boatman, water flea, water mite, water louse, small insect larvae, freshwater shrimp.
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post #9 of 10 (permalink) Old 07-11-2013, 05:55 AM Thread Starter
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Thanks. Well I guess I'll just keep an eye on my shrimp tank and hope none of them have gotten into it. My 55 gallon tank should be fine. If there are other damsel fly nymphs, my ghost knife has probably been eating them.

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post #10 of 10 (permalink) Old 07-11-2013, 08:55 AM
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Eww..can't stand them.
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