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Tuckcast has attached this picture to aid in identification. The message is below.
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TuckcastJuly 14th, 2019, 11:22 am
Posts: 2I took these from the mouth of a trout I caught in Oil Creek in
NW PA. I occasionally find these in the mouths of fish in this stream. These bugs were out of water for about 8 hrs when I remembered about them. As soon
as I put them in water 2 of them just took off swimming. The 3rd one had expired. What I’d like to know is: Are these fish food or parasites of some sort? The large one is about a size 18 nymph hook.
TaxonJuly 14th, 2019, 6:44 pm
Site Editor
Plano, TX

Posts: 1311
Hi Tuckcast-

Welcome to this site, :-)
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
MillcreekJuly 14th, 2019, 6:46 pm
Healdsburg, CA

Posts: 343
I think they may be Argulus americanus. It's a parasite. Further information can be found here;

https://www.google.com/search?q=argulus+americanus&tbm=isch&source=univ&sa=X&ved=2ahUKEwjlqZmv8bXjAhWLQs0KHTibAX4QsAR6BAgFEAE&biw=1536&bih=722&dpr=1.25#img
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
TuckcastJuly 15th, 2019, 4:04 am
Posts: 2Thanks so much for the ID. I
Guess I won’t bother trying to tie an imitation.

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