Need identification

[fatboy8]

Anyone know what these are? Found four in my power heads intake. Tank is a 90 gallon cold water with trout. Almost look like hellgrammites but I'm not sure


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[fatboy8]

Just also saw they're all over the inside of my canister filters intake they're all about a quarter inch and look dead


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[flukekiller]

looks like a dragon fly nymph or something similar to that.

 

[Ponera]

my guess would be stonefly nymph but would need a clear dorsal picture to identify for sure. I don't think it's a dragon or damsel fly, wrong head from what I can see which isn't much. Would need a clear picture of the underside of the head to ID that one out better.

Source: Took freshwater invertebrates when I did university .

Edit: it could actually be a dragon/damselfly though. Hard to tell with the pics, can you score us some better ones?

 

[fatboy8]

Cool I mean my canister hoses and all of my equipment had them everywhere. Just moved the trout to a pond so I'm going to tropical with the tank I can't see these posing any harm to tropical fish correct?


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[Ponera]

If it is fast coldwater that is stonefly nymph heaven. They are harmless to any fish they can't outright catch and eat. I kept some damselfly larvae with my newts when I had them, it was all good.

They won't harm your fish unless your fish are damn small, lol.

 

[Ponera]

is this what you have?

 

[fatboy8]

Yeah 100% stone fly nymph that explains why they where loaded up in the intake and outtake hoses on my canister. As for size these things were around a quarter inch.I appreciate the help guys


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[Ponera]

Cool. You should double check the mouth to make sure it doesn't have these weird arms on its face that make a weird spoon looking thing. You'll know it when you extend it, can you check? That'll confirm to 100% that it's stonefly and not dragonfly.

 

[Ponera]

Are you still at 100%? this is a dragonfly larva. You can tell the difference basted on the dorsal parts of the thoracic segments (so the stoneflies tend to have more defined ones.) The dragonfly also has a bum that is extended for jet propulsion. Literally, hah. The most diagnostic is the mouth.



Literally like a spoon attached to an arm that sits like a darth vader mask when not extended. That is so diagnostic.

Check it out if you have the corpses still, it takes a second and will help us figure out your mystery more!


Edit: THIS IS PURELY TO GET AN ID AS YOU ASKED FOR ONE. WHAT YOU HAVE WILL NOT AND CANNOT CAUSE ISSUES UNLESS YOU ARE HANDLING FRY OR VERY SMALL FISH.