Currently viewing the tag: "Aquatic Bugs"
What's That Bug? does not endorse extermination

Subject: South BC bug, similar to the insect image on your website
Location: South BC
August 19, 2017 6:29 am
Hi there Bugman,
My mate found this insect in the river in south BC.
I’ve been looking everywhere online to find out what this insect is. Not much result! However, the closest thing that has come up is the picture on your website right under “TOP TEN” on the left side bar.
Could you please tell us what it is?
Thanks mucho and much bug love!
Signature: Bugman

Stonefly Naiad

The image on our homepage is an Earwig, and though your creature shares some similarities, they are not closely related.  Your insect is an aquatic nymph, the naiad of a Stonefly.   Your individual looks very similar to this BugGuide image submitted from Alberta, Canada.

What's That Bug? does not endorse extermination

Subject: Identify this organism please
Location: California USA
August 7, 2017 4:13 pm
Saw a lot of these on a house pond with fish. Are they safe?
Signature: Water bug?

I found out its a mosquito larvae

Mosquito Larva

You are correct that this is a Mosquito larva.  They are commonly called Wrigglers because of the way they move through the water.  Home gardeners in California, where most gardens get frequent watering, are warned that even the smallest container of water can become a breeding ground for Mosquitoes.  It is quite interesting that the fish in the pond are not eating the Mosquito larvae.  If the fish are Koi, they might be too large to be interested in such a small creature, but introducing mosquito fish might help control the situation.

What's That Bug? does not endorse extermination

Subject: New Jersey leech like insect
Location: Gloucester County New Jersey, USA
August 2, 2017 8:17 pm
I have standing water on my property that is there from rain, not spring feed, today while looking at the water, I noticed these flat brownish insects in the water, I don’t remember seeing these bugs before, I thought they might be leeches but every picture I googled of leeches showed them being black. Also these bugs have pitchers, please help, thank you,
Signature: D. Clement

Water Tiger and Tadpoles

Dear D. Clement,
This appears to be a predatory larva of an aquatic beetle, commonly called a Water Tiger.  It is surrounded by Tadpoles, and they are most likely its prey.

What's That Bug? does not endorse extermination

Subject: Mantid in pond water
Location: Jacksonville, Florida
August 1, 2017 10:09 am
Hello! All summer here in Jacksonville, FL, from May to August so far, I’ve been finding small (2-3″) black insects that look like skinny praying mantises in my green, algae-filled pond. There are no fish, just various kinds of water bugs and tadpoles.
I removed the first couple, thinking they had blown in with the wind, but I keep finding more, every few days. They seem quite at home underwater, swimming around, and if I or my dog’s nose get too close, they calmly dive and swim out of sight.
I’ve been quite baffled. I used to keep fat green praying mantises as pets in southern Georgia as a kid, and got used to finding their egg cases attached to sticks. I couldn’t fathom mantises breeding and/or living underwater…. or laying eggs in water, perhaps going through a nymph phase of some kind, then developing into what you see in the pictures.
Hope you can help me understand what I’ve got, and advise me on whether I should be removing them to the bushes on sight, or leaving them to their business!
Signature: John in NE Florida

Water Scorpion

Dear John,
Though it resembles a Mantid, this Water Scorpion is actually an unrelated True Bug.  Adult Water Scorpions have wings so they can fly from pond to pond.  Handle with caution.  Water Scorpions are reported to have a painful bite.

What's That Bug? does not endorse extermination

Subject: Found by the side of a Canadian Lake
Location: Lake Eduard, Quebec
July 31, 2017 2:23 pm
If you’ve got time my 4 year old son Leo would love to know what this bug is.
It is about 3cm long and he found it on the rocks by the side of the lake shore.
Signature: Leo Taylor

Dragonhunter Naiad

Dear Leo,
This is a Dragonhunter naiad, the aquatic nymph of the dragonfly species
Hagenius brevistylus. 

What's That Bug? does not endorse extermination

Subject: Aquatic bug?!
Location: Glacial river, base of mt Rainier
July 31, 2017 8:24 pm
Hello! We were out playing in a very cold glacial river at the base of Mt Rainier in Washington state and came across these guys today. There were hundreds of them on rocks in the water, but only a few this sprawled out and large outside the water.
Signature: Alexa

Stonefly Exuvia

Dear Alexa,
Your images document two different, unrelated aquatic insects.  The image of the one “sprawled out and large outside the water” is actually the exuvia or cast-off exoskeleton of a Stonefly, and the “hundreds of them on rocks in the water” are Caseworms, the larvae or naiads of Caddisflies.  Larval Caddisflies are known as Caseworms and according to BugGuide:  “Most species live in a mobile case constructed from plant material, algae, grains of sand, pieces of snail shells, or entirely of silk. The case is held together with strands of silk secreted by the larva. In some species the case is attached to a rock, log, or other underwater surface; a few species have no case and are free-living.”  The cases on your individuals appear to be constructed using grains of sand or small pebbles.

Caseworms: Caddisfly Naiads

Caseworms: Caddisfly Naiads

What's That Bug? does not endorse extermination