What's That Bug? does not endorse extermination

What is this!
Hello Bugman,
I was at Lake Dorathy in Kirkland Lake, Ontario, swimming with some friends when this bug floated by and we grabbed it with the insect net. When I went touch it, it pinched me with it’s pincers, which are extremely sharp! It’s got a stinger like tail, and it resembles a shrimp in the body. I asked the folks that have been there for over 20 years and they had no idea. They think it may be some form of Larvae or nymph. If you could let me know what this thing is that would be wonderful. I’ve attached some pictures, hopefully they’ll help. Thanks!
Dan

Hi Dan,
This is a Water Tiger, the larva of the Predaceous Diving Beetle. Looks like it caught a minnow.

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